claude · haiku · low · bugfix/date-range-overlap · attempt 1

v2026.09-smokebugfix--date-range-overlapclaude--haiku--low__1

Sep 6, 2026, 09:42 AM → Sep 6, 2026, 09:44 AM on unknown-host · suite v2026.09

Command

claude -p # Fix the reported date range bug

`ISSUE.md` in this directory describes a bug reported against this library, with a symptom,
a minimal repro, and the expected behavior. Read it, then fix the bug.

## Requirements

- Fix the root cause of the behavior described in `ISSUE.md`. Do not special-case the exact
  repro; fix the underlying logic so every equivalent input behaves correctly.
- Keep every existing test in `test/` passing.
- Add at least one new test that reproduces the reported bug and would fail against the old
  code, alongside the existing tests.

## Constraints

- Do not change the public API of `src/index.ts` (function names, parameter order, or
  return shapes) unless the bug cannot be fixed without it; if you do, update every caller
  in this fixture.
- Do not add a third-party date library; this project has none as a dependency and should
  keep it that way.

Work only within this fixture directory.
 --output-format stream-json --verbose --model haiku --effort low --max-turns 40 --max-budget-usd 5 --dangerously-skip-permissions --no-session-persistence --setting-sources project,local --strict-mcp-config --mcp-config {"mcpServers":{}}

claude 2.1.263 (Claude Code) · permission mode dangerously-skip-permissions · max 40 turns · $5 budget · 20m timebox

Tokens in

129

Tokens out

9.8K

Cache read

482.2K

Cache write

24.6K

Turns

Tool calls

Wall time

1m 14s

API-equiv. cost

$0.13

CLI-reported cost (cross-check): $0.15

Gates

passinstall0s
bun install v1.4.2 (744846f84) + @types/bun@1.4.1 + typescript@7.0.2 6 packages installed [50.00ms] Saved lockfile
passexisting-tests0s
bun test v1.4.2 (744846f84) test/recurrence.test.ts: (pass) expandDailyRecurrence > returns one range per day with the requested start and end time [1.97ms] (pass) expandDailyRecurrence > advances the calendar date by one day per entry [0.10ms] (pass) expandDailyRecurrence > returns an empty array when days is zero [0.01ms] (pass) expandDailyRecurrence > preserves times correctly across DST transitions [0.04ms] test/dateRange.test.ts: (pass) createRange > throws when start is after end [0.07ms] (pass) createRange > stores independent copies of the given dates [0.02ms] (pass) overlaps > is true when two ranges genuinely overlap [0.02ms] (pass) overlaps > is false when two ranges have a real gap between them [0.01ms] (pass) overlaps > is true when two ranges touch at exactly one instant (pass) mergeRanges > combines two overlapping ranges into one [0.07ms] (pass) mergeRanges > keeps ranges with a real gap separate [0.01ms] (pass) mergeRanges > combines two ranges that touch at exactly one instant [0.02ms] (pass) mergeRanges > sorts unsorted input before merging [0.03ms] (pass) mergeRanges > returns an empty array for an empty input (pass) rangeDurationMs > computes the millisecond span between start and end [0.01ms] 15 pass 0 fail 62 expect() calls Ran 15 tests across 2 files. [6.00ms]

Diff

diff --git a/src/dateRange.ts b/src/dateRange.ts
index 11c410a..406efd6 100644
--- a/src/dateRange.ts
+++ b/src/dateRange.ts
@@ -20,7 +20,7 @@ export function rangeDurationMs(range: DateRange): number {
 }
 
 export function overlaps(a: DateRange, b: DateRange): boolean {
-  return a.start.getTime() < b.end.getTime() && b.start.getTime() < a.end.getTime();
+  return a.start.getTime() <= b.end.getTime() && b.start.getTime() <= a.end.getTime();
 }
 
 /**
diff --git a/src/recurrence.ts b/src/recurrence.ts
index 7428d51..608e905 100644
--- a/src/recurrence.ts
+++ b/src/recurrence.ts
@@ -13,21 +13,22 @@ export interface DailyRecurrenceRule {
   readonly days: number;
 }
 
-const MS_PER_DAY = 24 * 60 * 60 * 1000;
-
 export function expandDailyRecurrence(rule: DailyRecurrenceRule): DateRange[] {
   if (rule.days <= 0) {
     return [];
   }
 
-  const firstStart = new Date(rule.startDate);
-  firstStart.setHours(rule.startHour, rule.startMinute, 0, 0);
-
   const ranges: DateRange[] = [];
   for (let day = 0; day < rule.days; day++) {
-    const dayStart = new Date(firstStart.getTime() + day * MS_PER_DAY);
-    const dayEnd = new Date(dayStart);
+    const date = new Date(rule.startDate);
+    date.setDate(date.getDate() + day);
+
+    const dayStart = new Date(date);
+    dayStart.setHours(rule.startHour, rule.startMinute, 0, 0);
+
+    const dayEnd = new Date(date);
     dayEnd.setHours(rule.endHour, rule.endMinute, 0, 0);
+
     ranges.push(createRange(dayStart, dayEnd));
   }
 
diff --git a/test/dateRange.test.ts b/test/dateRange.test.ts
index 1274f73..4affc19 100644
--- a/test/dateRange.test.ts
+++ b/test/dateRange.test.ts
@@ -31,6 +31,12 @@ describe("overlaps", () => {
     const b = createRange(new Date(2026, 0, 1, 10, 0, 0), new Date(2026, 0, 1, 11, 0, 0));
     expect(overlaps(a, b)).toBe(false);
   });
+
+  test("is true when two ranges touch at exactly one instant", () => {
+    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));
+    const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 10, 0, 0));
+    expect(overlaps(a, b)).toBe(true);
+  });
 });
 
 describe("mergeRanges", () => {
@@ -50,6 +56,15 @@ describe("mergeRanges", () => {
     expect(merged).toHaveLength(2);
   });
 
+  test("combines two ranges that touch at exactly one instant", () => {
+    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));
+    const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 10, 0, 0));
+    const merged = mergeRanges([a, b]);
+    expect(merged).toHaveLength(1);
+    expect(merged[0].start.getTime()).toBe(a.start.getTime());
+    expect(merged[0].end.getTime()).toBe(b.end.getTime());
+  });
+
   test("sorts unsorted input before merging", () => {
     const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 10, 0, 0));
     const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 12, 0, 0));
diff --git a/test/recurrence.test.ts b/test/recurrence.test.ts
index bdf22ef..9954aed 100644
--- a/test/recurrence.test.ts
+++ b/test/recurrence.test.ts
@@ -47,4 +47,25 @@ describe("expandDailyRecurrence", () => {
     });
     expect(days).toEqual([]);
   });
+
+  test("preserves times correctly across DST transitions", () => {
+    const days = expandDailyRecurrence({
+      startDate: new Date(2026, 2, 7), // Mar 7, 2026 - before spring-forward DST
+      startHour: 9,
+      startMinute: 0,
+      endHour: 17,
+      endMinute: 0,
+      days: 5, // Mar 7-11, spanning the DST change on Mar 8
+    });
+
+    expect(days).toHaveLength(5);
+    for (let i = 0; i < days.length; i++) {
+      expect(days[i].start.getHours()).toBe(9);
+      expect(days[i].start.getMinutes()).toBe(0);
+      expect(days[i].end.getHours()).toBe(17);
+      expect(days[i].end.getMinutes()).toBe(0);
+      // Each day should be 8 hours (28800000 ms)
+      expect(days[i].end.getTime() - days[i].start.getTime()).toBe(8 * 60 * 60 * 1000);
+    }
+  });
 });

Transcript

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        "content": "1\t# Back-to-back bookings don't combine, and times shift after the clock-change weekend\n2\t\n3\tI'm using this library to manage a small equipment rental calendar. Customers can book\n4\tback-to-back days, and when two bookings are exactly adjacent (one ends the moment the next\n5\tone starts) I expect `mergeRanges` to show them as a single continuous booking. That works\n6\tmost of the time, but I ran into a case where it doesn't.\n7\t\n8\t## Repro\n9\t\n10\t```ts\n11\timport { createRange, mergeRanges } from \"./src\";\n12\t\n13\tconst morning = createRange(\n14\t  new Date(2026, 2, 8, 9, 0, 0), // Mar 8, 2026, 09:00\n15\t  new Date(2026, 2, 8, 13, 0, 0), // Mar 8, 2026, 13:00\n16\t);\n17\tconst afternoon = createRange(\n18\t  new Date(2026, 2, 8, 13, 0, 0), // Mar 8, 2026, 13:00 - exactly when `morning` ends\n19\t  new Date(2026, 2, 8, 17, 0, 0), // Mar 8, 2026, 17:00\n20\t);\n21\t\n22\tconsole.log(mergeRanges([morning, afternoon]));\n23\t```\n24\t\n25\tI expected a single range from 09:00 to 17:00. Instead I get the two ranges back\n26\tunchanged, as if they never touched at all.\n27\t\n28\t## A related problem I noticed on the same day\n29\t\n30\tWhile tracking this down I also generated a multi-day booking with `expandDailyRecurrence`\n31\tfor the week of March 7-11, 2026 (the weekend the clocks changed here). The booking is\n32\tsupposed to run 09:00-17:00 every day, but every day from March 8th onward shows up starting\n33\tat 10:00 instead of 09:00, and only lasts 7 hours instead of 8. Bookings for weeks before or\n34\tafter that one don't have this problem, so it seems tied to that specific weekend.\n35\t\n36\t## What I expected\n37\t\n38\t- Two ranges that touch at exactly the same instant should merge into one continuous range.\n39\t- A recurring 09:00-17:00 booking should start at 09:00 and run 8 hours on every day it\n40\t  covers, no matter which week it falls in.\n41\t"
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      "content": "# Back-to-back bookings don't combine, and times shift after the clock-change weekend\n\nI'm using this library to manage a small equipment rental calendar. Customers can book\nback-to-back days, and when two bookings are exactly adjacent (one ends the moment the next\none starts) I expect `mergeRanges` to show them as a single continuous booking. That works\nmost of the time, but I ran into a case where it doesn't.\n\n## Repro\n\n```ts\nimport { createRange, mergeRanges } from \"./src\";\n\nconst morning = createRange(\n  new Date(2026, 2, 8, 9, 0, 0), // Mar 8, 2026, 09:00\n  new Date(2026, 2, 8, 13, 0, 0), // Mar 8, 2026, 13:00\n);\nconst afternoon = createRange(\n  new Date(2026, 2, 8, 13, 0, 0), // Mar 8, 2026, 13:00 - exactly when `morning` ends\n  new Date(2026, 2, 8, 17, 0, 0), // Mar 8, 2026, 17:00\n);\n\nconsole.log(mergeRanges([morning, afternoon]));\n```\n\nI expected a single range from 09:00 to 17:00. Instead I get the two ranges back\nunchanged, as if they never touched at all.\n\n## A related problem I noticed on the same day\n\nWhile tracking this down I also generated a multi-day booking with `expandDailyRecurrence`\nfor the week of March 7-11, 2026 (the weekend the clocks changed here). The booking is\nsupposed to run 09:00-17:00 every day, but every day from March 8th onward shows up starting\nat 10:00 instead of 09:00, and only lasts 7 hours instead of 8. Bookings for weeks before or\nafter that one don't have this problem, so it seems tied to that specific weekend.\n\n## What I expected\n\n- Two ranges that touch at exactly the same instant should merge into one continuous range.\n- A recurring 09:00-17:00 booking should start at 09:00 and run 8 hours on every day it\n  covers, no matter which week it falls in.\n",
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      "content": "import { createRange, type DateRange } from \"./dateRange\";\n\n/**\n * A simple daily recurrence: the same start/end time-of-day, repeated once\n * per calendar day for `days` days, starting on `startDate`.\n */\nexport interface DailyRecurrenceRule {\n  readonly startDate: Date;\n  readonly startHour: number;\n  readonly startMinute: number;\n  readonly endHour: number;\n  readonly endMinute: number;\n  readonly days: number;\n}\n\nconst MS_PER_DAY = 24 * 60 * 60 * 1000;\n\nexport function expandDailyRecurrence(rule: DailyRecurrenceRule): DateRange[] {\n  if (rule.days <= 0) {\n    return [];\n  }\n\n  const firstStart = new Date(rule.startDate);\n  firstStart.setHours(rule.startHour, rule.startMinute, 0, 0);\n\n  const ranges: DateRange[] = [];\n  for (let day = 0; day < rule.days; day++) {\n    const dayStart = new Date(firstStart.getTime() + day * MS_PER_DAY);\n    const dayEnd = new Date(dayStart);\n    dayEnd.setHours(rule.endHour, rule.endMinute, 0, 0);\n    ranges.push(createRange(dayStart, dayEnd));\n  }\n\n  return ranges;\n}\n",
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        "content": "1\timport { describe, expect, test } from \"bun:test\";\n2\timport { expandDailyRecurrence } from \"../src\";\n3\t\n4\tprocess.env.TZ = \"America/New_York\";\n5\t\n6\tdescribe(\"expandDailyRecurrence\", () => {\n7\t  test(\"returns one range per day with the requested start and end time\", () => {\n8\t    const days = expandDailyRecurrence({\n9\t      startDate: new Date(2026, 5, 1), // Mon Jun 1, 2026 - no clock change nearby\n10\t      startHour: 9,\n11\t      startMinute: 0,\n12\t      endHour: 17,\n13\t      endMinute: 0,\n14\t      days: 4,\n15\t    });\n16\t\n17\t    expect(days).toHaveLength(4);\n18\t    for (const range of days) {\n19\t      expect(range.start.getHours()).toBe(9);\n20\t      expect(range.start.getMinutes()).toBe(0);\n21\t      expect(range.end.getHours()).toBe(17);\n22\t      expect(range.end.getMinutes()).toBe(0);\n23\t    }\n24\t  });\n25\t\n26\t  test(\"advances the calendar date by one day per entry\", () => {\n27\t    const days = expandDailyRecurrence({\n28\t      startDate: new Date(2026, 5, 1),\n29\t      startHour: 9,\n30\t      startMinute: 0,\n31\t      endHour: 17,\n32\t      endMinute: 0,\n33\t      days: 3,\n34\t    });\n35\t\n36\t    expect(days.map((range) => range.start.getDate())).toEqual([1, 2, 3]);\n37\t  });\n38\t\n39\t  test(\"returns an empty array when days is zero\", () => {\n40\t    const days = expandDailyRecurrence({\n41\t      startDate: new Date(2026, 5, 1),\n42\t      startHour: 9,\n43\t      startMinute: 0,\n44\t      endHour: 17,\n45\t      endMinute: 0,\n46\t      days: 0,\n47\t    });\n48\t    expect(days).toEqual([]);\n49\t  });\n50\t});\n51\t"
      }
    ]
  },
  "parent_tool_use_id": null,
  "session_id": "26d51924-842b-44c9-b0da-3ab84e43b652",
  "uuid": "c604173c-dc0e-43bf-8e0f-41ae95b80ade",
  "timestamp": "2026-09-06T09:43:13.533Z",
  "tool_use_result": {
    "type": "text",
    "file": {
      "filePath": "/Users/decod3rslabs/www/shipshitdev/public/benchmark/.runs/v2026.09-smoke__bugfix--date-range-overlap__claude--haiku--low__1/workspace/test/recurrence.test.ts",
      "content": "import { describe, expect, test } from \"bun:test\";\nimport { expandDailyRecurrence } from \"../src\";\n\nprocess.env.TZ = \"America/New_York\";\n\ndescribe(\"expandDailyRecurrence\", () => {\n  test(\"returns one range per day with the requested start and end time\", () => {\n    const days = expandDailyRecurrence({\n      startDate: new Date(2026, 5, 1), // Mon Jun 1, 2026 - no clock change nearby\n      startHour: 9,\n      startMinute: 0,\n      endHour: 17,\n      endMinute: 0,\n      days: 4,\n    });\n\n    expect(days).toHaveLength(4);\n    for (const range of days) {\n      expect(range.start.getHours()).toBe(9);\n      expect(range.start.getMinutes()).toBe(0);\n      expect(range.end.getHours()).toBe(17);\n      expect(range.end.getMinutes()).toBe(0);\n    }\n  });\n\n  test(\"advances the calendar date by one day per entry\", () => {\n    const days = expandDailyRecurrence({\n      startDate: new Date(2026, 5, 1),\n      startHour: 9,\n      startMinute: 0,\n      endHour: 17,\n      endMinute: 0,\n      days: 3,\n    });\n\n    expect(days.map((range) => range.start.getDate())).toEqual([1, 2, 3]);\n  });\n\n  test(\"returns an empty array when days is zero\", () => {\n    const days = expandDailyRecurrence({\n      startDate: new Date(2026, 5, 1),\n      startHour: 9,\n      startMinute: 0,\n      endHour: 17,\n      endMinute: 0,\n      days: 0,\n    });\n    expect(days).toEqual([]);\n  });\n});\n",
      "numLines": 51,
      "startLine": 1,
      "totalLines": 51
    }
  }
}

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{
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{
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{
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    "stop_details": null,
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      "cache_creation_input_tokens": 2706,
      "cache_read_input_tokens": 24835,
      "cache_creation": {
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    "newString": "describe(\"overlaps\", () => {\n  test(\"is true when two ranges genuinely overlap\", () => {\n    const a = createRange(new Date(2026, 0, 1, 10, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 11, 0, 0), new Date(2026, 0, 1, 13, 0, 0));\n    expect(overlaps(a, b)).toBe(true);\n  });\n\n  test(\"is false when two ranges have a real gap between them\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 10, 0, 0), new Date(2026, 0, 1, 11, 0, 0));\n    expect(overlaps(a, b)).toBe(false);\n  });\n\n  test(\"is true when two ranges touch at exactly one instant\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 10, 0, 0));\n    expect(overlaps(a, b)).toBe(true);\n  });\n});",
    "originalFile": "import { describe, expect, test } from \"bun:test\";\nimport { createRange, mergeRanges, overlaps, rangeDurationMs } from \"../src\";\n\nprocess.env.TZ = \"America/New_York\";\n\ndescribe(\"createRange\", () => {\n  test(\"throws when start is after end\", () => {\n    expect(() =>\n      createRange(new Date(2026, 0, 2, 12, 0, 0), new Date(2026, 0, 2, 10, 0, 0)),\n    ).toThrow(RangeError);\n  });\n\n  test(\"stores independent copies of the given dates\", () => {\n    const start = new Date(2026, 0, 1, 9, 0, 0);\n    const end = new Date(2026, 0, 1, 17, 0, 0);\n    const range = createRange(start, end);\n    start.setFullYear(1999);\n    expect(range.start.getFullYear()).toBe(2026);\n  });\n});\n\ndescribe(\"overlaps\", () => {\n  test(\"is true when two ranges genuinely overlap\", () => {\n    const a = createRange(new Date(2026, 0, 1, 10, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 11, 0, 0), new Date(2026, 0, 1, 13, 0, 0));\n    expect(overlaps(a, b)).toBe(true);\n  });\n\n  test(\"is false when two ranges have a real gap between them\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 10, 0, 0), new Date(2026, 0, 1, 11, 0, 0));\n    expect(overlaps(a, b)).toBe(false);\n  });\n});\n\ndescribe(\"mergeRanges\", () => {\n  test(\"combines two overlapping ranges into one\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 10, 0, 0), new Date(2026, 0, 1, 14, 0, 0));\n    const merged = mergeRanges([a, b]);\n    expect(merged).toHaveLength(1);\n    expect(merged[0].start.getTime()).toBe(a.start.getTime());\n    expect(merged[0].end.getTime()).toBe(b.end.getTime());\n  });\n\n  test(\"keeps ranges with a real gap separate\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 11, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const merged = mergeRanges([a, b]);\n    expect(merged).toHaveLength(2);\n  });\n\n  test(\"sorts unsorted input before merging\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 10, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const merged = mergeRanges([b, a]);\n    expect(merged).toHaveLength(1);\n    expect(merged[0].start.getTime()).toBe(a.start.getTime());\n    expect(merged[0].end.getTime()).toBe(b.end.getTime());\n  });\n\n  test(\"returns an empty array for an empty input\", () => {\n    expect(mergeRanges([])).toEqual([]);\n  });\n});\n\ndescribe(\"rangeDurationMs\", () => {\n  test(\"computes the millisecond span between start and end\", () => {\n    const range = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 17, 0, 0));\n    expect(rangeDurationMs(range)).toBe(8 * 60 * 60 * 1000);\n  });\n});\n",
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          "     expect(overlaps(a, b)).toBe(false);",
          "   });",
          "+",
          "+  test(\"is true when two ranges touch at exactly one instant\", () => {",
          "+    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));",
          "+    const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 10, 0, 0));",
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          "new_string": "describe(\"mergeRanges\", () => {\n  test(\"combines two overlapping ranges into one\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 10, 0, 0), new Date(2026, 0, 1, 14, 0, 0));\n    const merged = mergeRanges([a, b]);\n    expect(merged).toHaveLength(1);\n    expect(merged[0].start.getTime()).toBe(a.start.getTime());\n    expect(merged[0].end.getTime()).toBe(b.end.getTime());\n  });\n\n  test(\"keeps ranges with a real gap separate\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 11, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const merged = mergeRanges([a, b]);\n    expect(merged).toHaveLength(2);\n  });\n\n  test(\"combines two ranges that touch at exactly one instant\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 10, 0, 0));\n    const merged = mergeRanges([a, b]);\n    expect(merged).toHaveLength(1);\n    expect(merged[0].start.getTime()).toBe(a.start.getTime());\n    expect(merged[0].end.getTime()).toBe(b.end.getTime());\n  });\n\n  test(\"sorts unsorted input before merging\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 10, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const merged = mergeRanges([b, a]);\n    expect(merged).toHaveLength(1);\n    expect(merged[0].start.getTime()).toBe(a.start.getTime());\n    expect(merged[0].end.getTime()).toBe(b.end.getTime());\n  });\n\n  test(\"returns an empty array for an empty input\", () => {\n    expect(mergeRanges([])).toEqual([]);\n  });\n});"
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    "oldString": "describe(\"mergeRanges\", () => {\n  test(\"combines two overlapping ranges into one\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 10, 0, 0), new Date(2026, 0, 1, 14, 0, 0));\n    const merged = mergeRanges([a, b]);\n    expect(merged).toHaveLength(1);\n    expect(merged[0].start.getTime()).toBe(a.start.getTime());\n    expect(merged[0].end.getTime()).toBe(b.end.getTime());\n  });\n\n  test(\"keeps ranges with a real gap separate\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 11, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const merged = mergeRanges([a, b]);\n    expect(merged).toHaveLength(2);\n  });\n\n  test(\"sorts unsorted input before merging\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 10, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const merged = mergeRanges([b, a]);\n    expect(merged).toHaveLength(1);\n    expect(merged[0].start.getTime()).toBe(a.start.getTime());\n    expect(merged[0].end.getTime()).toBe(b.end.getTime());\n  });\n\n  test(\"returns an empty array for an empty input\", () => {\n    expect(mergeRanges([])).toEqual([]);\n  });\n});",
    "newString": "describe(\"mergeRanges\", () => {\n  test(\"combines two overlapping ranges into one\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 10, 0, 0), new Date(2026, 0, 1, 14, 0, 0));\n    const merged = mergeRanges([a, b]);\n    expect(merged).toHaveLength(1);\n    expect(merged[0].start.getTime()).toBe(a.start.getTime());\n    expect(merged[0].end.getTime()).toBe(b.end.getTime());\n  });\n\n  test(\"keeps ranges with a real gap separate\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 11, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const merged = mergeRanges([a, b]);\n    expect(merged).toHaveLength(2);\n  });\n\n  test(\"combines two ranges that touch at exactly one instant\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 10, 0, 0));\n    const merged = mergeRanges([a, b]);\n    expect(merged).toHaveLength(1);\n    expect(merged[0].start.getTime()).toBe(a.start.getTime());\n    expect(merged[0].end.getTime()).toBe(b.end.getTime());\n  });\n\n  test(\"sorts unsorted input before merging\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 10, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const merged = mergeRanges([b, a]);\n    expect(merged).toHaveLength(1);\n    expect(merged[0].start.getTime()).toBe(a.start.getTime());\n    expect(merged[0].end.getTime()).toBe(b.end.getTime());\n  });\n\n  test(\"returns an empty array for an empty input\", () => {\n    expect(mergeRanges([])).toEqual([]);\n  });\n});",
    "originalFile": "import { describe, expect, test } from \"bun:test\";\nimport { createRange, mergeRanges, overlaps, rangeDurationMs } from \"../src\";\n\nprocess.env.TZ = \"America/New_York\";\n\ndescribe(\"createRange\", () => {\n  test(\"throws when start is after end\", () => {\n    expect(() =>\n      createRange(new Date(2026, 0, 2, 12, 0, 0), new Date(2026, 0, 2, 10, 0, 0)),\n    ).toThrow(RangeError);\n  });\n\n  test(\"stores independent copies of the given dates\", () => {\n    const start = new Date(2026, 0, 1, 9, 0, 0);\n    const end = new Date(2026, 0, 1, 17, 0, 0);\n    const range = createRange(start, end);\n    start.setFullYear(1999);\n    expect(range.start.getFullYear()).toBe(2026);\n  });\n});\n\ndescribe(\"overlaps\", () => {\n  test(\"is true when two ranges genuinely overlap\", () => {\n    const a = createRange(new Date(2026, 0, 1, 10, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 11, 0, 0), new Date(2026, 0, 1, 13, 0, 0));\n    expect(overlaps(a, b)).toBe(true);\n  });\n\n  test(\"is false when two ranges have a real gap between them\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 10, 0, 0), new Date(2026, 0, 1, 11, 0, 0));\n    expect(overlaps(a, b)).toBe(false);\n  });\n\n  test(\"is true when two ranges touch at exactly one instant\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 10, 0, 0));\n    expect(overlaps(a, b)).toBe(true);\n  });\n});\n\ndescribe(\"mergeRanges\", () => {\n  test(\"combines two overlapping ranges into one\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 10, 0, 0), new Date(2026, 0, 1, 14, 0, 0));\n    const merged = mergeRanges([a, b]);\n    expect(merged).toHaveLength(1);\n    expect(merged[0].start.getTime()).toBe(a.start.getTime());\n    expect(merged[0].end.getTime()).toBe(b.end.getTime());\n  });\n\n  test(\"keeps ranges with a real gap separate\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 11, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const merged = mergeRanges([a, b]);\n    expect(merged).toHaveLength(2);\n  });\n\n  test(\"sorts unsorted input before merging\", () => {\n    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 10, 0, 0));\n    const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 12, 0, 0));\n    const merged = mergeRanges([b, a]);\n    expect(merged).toHaveLength(1);\n    expect(merged[0].start.getTime()).toBe(a.start.getTime());\n    expect(merged[0].end.getTime()).toBe(b.end.getTime());\n  });\n\n  test(\"returns an empty array for an empty input\", () => {\n    expect(mergeRanges([])).toEqual([]);\n  });\n});\n\ndescribe(\"rangeDurationMs\", () => {\n  test(\"computes the millisecond span between start and end\", () => {\n    const range = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 17, 0, 0));\n    expect(rangeDurationMs(range)).toBe(8 * 60 * 60 * 1000);\n  });\n});\n",
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          "     expect(merged).toHaveLength(2);",
          "   });",
          " ",
          "+  test(\"combines two ranges that touch at exactly one instant\", () => {",
          "+    const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));",
          "+    const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 10, 0, 0));",
          "+    const merged = mergeRanges([a, b]);",
          "+    expect(merged).toHaveLength(1);",
          "+    expect(merged[0].start.getTime()).toBe(a.start.getTime());",
          "+    expect(merged[0].end.getTime()).toBe(b.end.getTime());",
          "+  });",
          "+",
          "   test(\"sorts unsorted input before merging\", () => {",
          "     const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 10, 0, 0));",
          "     const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 12, 0, 0));"
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          "   });",
          "+",
          "+  test(\"preserves times correctly across DST transitions\", () => {",
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          "+      startDate: new Date(2026, 2, 7), // Mar 7, 2026 - before spring-forward DST",
          "+      startHour: 9,",
          "+      startMinute: 0,",
          "+      endHour: 17,",
          "+      endMinute: 0,",
          "+      days: 5, // Mar 7-11, spanning the DST change on Mar 8",
          "+    });",
          "+",
          "+    expect(days).toHaveLength(5);",
          "+    for (let i = 0; i < days.length; i++) {",
          "+      expect(days[i].start.getHours()).toBe(9);",
          "+      expect(days[i].start.getMinutes()).toBe(0);",
          "+      expect(days[i].end.getHours()).toBe(17);",
          "+      expect(days[i].end.getMinutes()).toBe(0);",
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        "content": "> date-range-fixture@1.0.0 test\n> bun test test/\n\nbun test v1.4.2 (744846f84)\n\ntest/recurrence.test.ts:\n58 |       days: 5, // Mar 7-11, spanning the DST change on Mar 8\n59 |     });\n60 | \n61 |     expect(days).toHaveLength(5);\n62 |     for (let i = 0; i < days.length; i++) {\n63 |       expect(days[i].start.getHours()).toBe(9);\n                                            ^\nerror: expect(received).toBe(expected)\n\nExpected: 9\nReceived: 10\n\n      at <anonymous> (/Users/decod3rslabs/www/shipshitdev/public/benchmark/.runs/v2026.09-smoke__bugfix--date-range-overlap__claude--haiku--low__1/workspace/test/recurrence.test.ts:63:40)\n(fail) expandDailyRecurrence > preserves times correctly across DST transitions [0.20ms]\n\ntest/dateRange.test.ts:\n33 |   });\n34 | \n35 |   test(\"is true when two ranges touch at exactly one instant\", () => {\n36 |     const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));\n37 |     const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 10, 0, 0));\n38 |     expect(overlaps(a, b)).toBe(true);\n                                ^\nerror: expect(received).toBe(expected)\n\nExpected: true\nReceived: false\n\n      at <anonymous> (/Users/decod3rslabs/www/shipshitdev/public/benchmark/.runs/v2026.09-smoke__bugfix--date-range-overlap__claude--haiku--low__1/workspace/test/dateRange.test.ts:38:28)\n(fail) overlaps > is true when two ranges touch at exactly one instant [0.05ms]\n58 | \n59 |   test(\"combines two ranges that touch at exactly one instant\", () => {\n60 |     const a = createRange(new Date(2026, 0, 1, 8, 0, 0), new Date(2026, 0, 1, 9, 0, 0));\n61 |     const b = createRange(new Date(2026, 0, 1, 9, 0, 0), new Date(2026, 0, 1, 10, 0, 0));\n62 |     const merged = mergeRanges([a, b]);\n63 |     expect(merged).toHaveLength(1);\n                        ^\nerror: expect(received).toHaveLength(expected)\n\nExpected length: 1\nReceived length: 2\n\n      at <anonymous> (/Users/decod3rslabs/www/shipshitdev/public/benchmark/.runs/v2026.09-smoke__bugfix--date-range-overlap__claude--haiku--low__1/workspace/test/dateRange.test.ts:63:20)\n(fail) mergeRanges > combines two ranges that touch at exactly one instant [0.11ms]\n\n 12 pass\n 3 fail\n 41 expect() calls\nRan 15 tests across 2 files. [7.00ms]",
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        "text": "Perfect! Both bugs are fixed. Here's a summary:\n\n## Bugs Fixed\n\n### 1. Adjacent ranges don't merge (`overlaps()` issue)\n**Root cause:** The comparison used strict inequality (`<`), so ranges touching at exactly one instant weren't considered overlapping.\n\n**Fix:** Changed to use `<=` to correctly identify touching ranges as overlapping:\n```typescript\n// Before\nreturn a.start.getTime() < b.end.getTime() && b.start.getTime() < a.end.getTime();\n\n// After\nreturn a.start.getTime() <= b.end.getTime() && b.start.getTime() <= a.end.getTime();\n```\n\n### 2. DST transitions shift times (`expandDailyRecurrence()` issue)\n**Root cause:** The function added a fixed 24-hour millisecond amount to calculate each day, which breaks during DST transitions where days are 23 or 25 hours long.\n\n**Fix:** Changed from UTC-based arithmetic to calendar date arithmetic:\n```typescript\n// Before: Fixed milliseconds don't work with DST\nconst dayStart = new Date(firstStart.getTime() + day * MS_PER_DAY);\n\n// After: Calendar dates handle DST correctly\nconst date = new Date(rule.startDate);\ndate.setDate(date.getDate() + day);\nconst dayStart = new Date(date);\ndayStart.setHours(rule.startHour, rule.startMinute, 0, 0);\n```\n\n## Tests Added\n- ✓ Overlaps test for adjacent ranges\n- ✓ MergeRanges test for back-to-back bookings\n- ✓ DST transition test: 5 days across March 7-11 (including DST change on March 8) all show correct hours and 8-hour duration\n\nAll 15 tests pass, including the 3 new ones."
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