Sonarly Claude Code 8efeae86af fix: parse date-only strings as local midnight in relative date formatting
https://sonarly.com/issue/24466?type=bug

DATE fields displayed in RELATIVE format show the wrong day (e.g., "Today" instead of "Tomorrow") for users in timezones west of UTC, because date-only strings are parsed as UTC midnight then compared against local time.

Fix: Changed the date parsing in `formatDateISOStringToRelativeDate.ts` line 22 to handle date-only strings (yyyy-MM-dd format, length 10) by appending `T00:00:00` without a trailing `Z`. This forces the `Date` constructor to interpret the string as local midnight instead of UTC midnight.

Per the ECMAScript spec, `new Date("2026-04-14")` produces UTC midnight (`2026-04-14T00:00:00.000Z`), which falls on April 13 in timezones west of UTC. By appending `T00:00:00` (no `Z`), the Date constructor uses local time, keeping the date on the correct calendar day for the user's timezone.

Full datetime strings (with time and timezone components, length > 10) continue to use the original `new Date(isoDate)` parsing, preserving correct behavior for the `formatDateTimeString` caller that passes datetime values.

This matches how the other format branches (USER_SETTINGS, CUSTOM) already handle timezone correctly via `formatInTimeZone` with explicit timezone parameters.
2026-04-13 12:35:47 +00:00
2026-04-11 10:00:24 +00:00
2025-08-07 17:02:12 +02:00

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