Reformat one date every way at once
A date needs ISO for the database, RFC for the email header, and a custom pattern for the report — write it once.
Tools used in this guide
The job
Copying a date between systems is a formatting problem: 2025-03-04 vs 03/04/2025 vs 'Tue, 4 Mar 2025' vs strftime patterns. The tool renders one input into every common notation.
Input plus pattern
Enter a date/time (or use now), set the UTC offset, and write a %Y %m %d %H %M %S-style pattern — then copy whichever line fits the destination.
Worked example
2025-03-04 15:30 at offset 0 renders ISO '2025-03-04T15:30:00+00:00', RFC 'Tue, 04 Mar 2025 15:30:00 +0000', en-US 'Mar 4, 2025, 3:30:00 PM', ja-JP '2025/03/04 15:30:00', plus custom '%d.%m.%Y' → '04.03.2025'.
Where it stops
The offset is a numeric UTC offset you type — named zones like 'JST→PST' are the timezone converter's job. English month/day names only in the custom pattern; the Intl rows cover locale formats. Years 0001–9999.