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JavaScript Date parsing varies by browser -- ISO 8601 only
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Date parsingISO 8601timezoneUTCmonth index
browsernodejs
Error Messages
Invalid Datedate off by one dayProblem
new Date('2024-01-15') behaves differently across browsers. Date parsing with non-standard formats is unreliable.
Solution
Only use ISO 8601 format. For reliable parsing use new Date(year, monthIndex, day) -- month is 0-indexed. Or use date-fns/Temporal.
Why
The spec only mandates ISO 8601 parsing. All other formats are implementation-defined.
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