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neon
c403ccb44c
Decode added dates and manual reading dates with an explicit parser instead of new Date(), which reads a zero-padded year below 100 as a two-digit year: years 0013 to 0031 became an Invalid Date and made every listing holding the book answer 500, and years 0001 to 0099 shifted silently into 19xx or 20xx. The column type is unchanged on the wire, so no migration is needed. Closes #1143
34 lines
1.9 KiB
TypeScript
34 lines
1.9 KiB
TypeScript
/**
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* PostgreSQL emits `timestamp with time zone` as text, and the driver hands that text
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* straight through. `new Date()` parses the space-separated form with V8's legacy parser,
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* which reads a zero-padded year below 100 as a two-digit year: `0050-06-15` comes back as
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* 1950, and years 0013 to 0031 fail to parse entirely. Any column that can hold a
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* user-supplied date must be decoded here instead.
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*/
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const PG_TIMESTAMPTZ_RE =
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/^(?<year>\d+)-(?<month>\d{2})-(?<day>\d{2})[ T](?<hour>\d{2}):(?<minute>\d{2}):(?<second>\d{2})(?:\.(?<fraction>\d+))?(?:Z|(?<sign>[+-])(?<offsetHours>\d{2})(?::?(?<offsetMinutes>\d{2}))?(?::?(?<offsetSeconds>\d{2}))?)?(?<era> BC)?$/;
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export function parsePgTimestamptz(value: string | Date): Date {
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if (value instanceof Date) return value;
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const groups = PG_TIMESTAMPTZ_RE.exec(value)?.groups;
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if (!groups) return new Date(value);
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// Postgres numbers BC years from 1, so 1 BC is astronomical year 0.
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const calendarYear = Number(groups.year);
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const year = groups.era ? 1 - calendarYear : calendarYear;
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// Postgres keeps microseconds; Date only holds milliseconds, so drop the excess rather
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// than rounding a value like .9996 up into the next second.
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const milliseconds = groups.fraction ? Math.trunc(Number(`0.${groups.fraction}`) * 1000) : 0;
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// Assigning the parts separately avoids Date.UTC(), which maps years 0 to 99 into 1900.
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const date = new Date(0);
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date.setUTCHours(Number(groups.hour), Number(groups.minute), Number(groups.second), milliseconds);
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date.setUTCFullYear(year, Number(groups.month) - 1, Number(groups.day));
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if (!groups.sign) return date;
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const offsetSeconds = Number(groups.offsetHours) * 3600 + Number(groups.offsetMinutes ?? 0) * 60 + Number(groups.offsetSeconds ?? 0);
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const offsetMs = (groups.sign === '-' ? -1 : 1) * offsetSeconds * 1000;
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return offsetMs === 0 ? date : new Date(date.getTime() - offsetMs);
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}
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