`src/utils/datetime.ts`

`makeRfc3339(date?: Date): string`

Formats a date as RFC 3339 with:

millisecond precision
local timezone offset (±HH:MM)

Parameters

date (optional): Date to format. Defaults to new Date().

Returns

RFC 3339 datetime string.

Example

makeRfc3339();
// "2026-05-14T18:26:13.246-05:00"