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NudgeToZonedTime: AddTimeDuration and AdjustDateDurationRecord are infallible #3030

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anba opened this issue Oct 30, 2024 · 0 comments
Open

NudgeToZonedTime: AddTimeDuration and AdjustDateDurationRecord are infallible #3030

anba opened this issue Oct 30, 2024 · 0 comments

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@anba
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anba commented Oct 30, 2024

NudgeToZonedTime, step 11:

  1. Let beyondDaySpan be ? AddTimeDuration(roundedTimeDuration, -daySpan).

This reduces the absolute value of roundedTimeDuration and therefore can't fail.

NudgeToZonedDateTime, step 14:

  1. Let dateDuration be ? AdjustDateDurationRecord(duration.[[Date]], duration.[[Date]].[[Days]] + dayDelta).

duration is the difference between two ZonedDateTime, so adding ±1 won't overflow the valid duration limits.
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@anba