25 lines
1.1 KiB
TypeScript
25 lines
1.1 KiB
TypeScript
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/**
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* Converts a datetime-local input value (local time, no timezone info)
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* to a UTC ISO string for server submission.
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*
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* `datetime-local` inputs use the format "YYYY-MM-DDTHH:MM" and do NOT accept
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* ISO strings with a timezone designator (e.g. "2026-03-11T17:00:00.000Z").
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* Setting an ISO UTC string directly on a datetime-local input causes the browser
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* to silently clear the field value. Use this function with a separate hidden input
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* to hold the converted UTC value before form submission.
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*
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* Returns null when value is empty, nullish, or not a valid date.
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*
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* NOTE: The returned ISO string (e.g. "2026-03-11T17:00:00.000Z") is intentionally
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* incompatible with datetime-local inputs, which only accept "YYYY-MM-DDTHH:MM".
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* Setting a Z-suffixed string on a datetime-local input causes browsers to silently
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* clear the field. Always write the result to a separate hidden input, not back to
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* the datetime-local input itself.
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*/
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export function localDateTimeToUtcIso(value: string | null | undefined): string | null {
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if (!value) return null;
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const date = new Date(value);
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if (isNaN(date.getTime())) return null;
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return date.toISOString();
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}
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