32 lines
1.1 KiB
TypeScript
32 lines
1.1 KiB
TypeScript
import dayjs from "@calcom/dayjs";
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/**
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* Converts a timestamp to maintain the same local time in a different timezone.
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*
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* For example, if it's midnight (00:00) in Paris time:
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* - Input : "2025-05-22T22:00:00.000Z" (Midnight/00:00 in Paris)
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* - Output: "2025-05-22T15:00:00.000Z" (Midnight/00:00 in Seoul)
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*
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* This ensures that times like midnight (00:00) or end of day (23:59)
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* remain at those exact local times when converting between timezones.
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* The output timestamp is based on the timezone in the user's profile settings.
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*/
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export const preserveLocalTime = (isoString: string, originalTimeZone: string, targetTimeZone: string) => {
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// Parse the input time
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const time = dayjs(isoString).tz(originalTimeZone);
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// Get the wall clock time components
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const hours = time.hour();
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const minutes = time.minute();
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const seconds = time.second();
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const milliseconds = time.millisecond();
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// Create a new date in target timezone with same wall clock time
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return dayjs
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.tz(time.format("YYYY-MM-DD"), targetTimeZone)
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.hour(hours)
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.minute(minutes)
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.second(seconds)
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.millisecond(milliseconds)
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.toISOString();
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};
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