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jubnl
17 lines
784 B
TypeScript
17 lines
784 B
TypeScript
/**
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* The user's LOCAL calendar date as 'YYYY-MM-DD'.
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*
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* Never derive "today" from `toISOString().split('T')[0]` — that is the UTC
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* date, which disagrees with the wall clock between local midnight and the UTC
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* rollover (for a UTC+2 user, from 00:00 to 02:00 every night). Trip and
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* journey dates are wall-clock dates, so every "is this today/past/upcoming"
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* comparison must use this instead.
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*
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* (Converting a Date you deliberately built in UTC — `new Date(s + 'T00:00:00Z')`
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* round-tripped through date arithmetic — is a different, self-consistent
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* pattern and fine as it is.)
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*/
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export function localIsoDate(d: Date = new Date()): string {
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return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`
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}
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