— tool guide

Date Format Converter

Convert dates between any format — ISO 8601, US, UK, RFC 2822, Unix timestamp, and more. Paste a date in one format and get it in all others instantly.

Open Date Format Converter → free, no sign-in

— try it live open full screen ↗

— what it is

Every system seems to use a different date format — APIs return ISO 8601, spreadsheets use MM/DD/YYYY, logs use RFC 2822, and databases store Unix timestamps. This tool parses a date from any common format and outputs it in every other standard format simultaneously, making cross-system date translation a one-paste operation.

— what it does

✓Parses 20+ input formats automatically
✓Outputs to: ISO 8601, ISO 8601 UTC, RFC 2822, RFC 3339, Unix seconds, Unix milliseconds, US (MM/DD/YYYY), UK (DD/MM/YYYY), long English, short English, and more
✓Timezone conversion: set input and output timezone independently
✓Relative time: shows "3 days ago" or "in 2 weeks"
✓Manual format builder using tokens (YYYY, MM, DD, HH, mm, ss)
✓Batch mode: convert a column of dates from one format to another
✓Copy any output format with one click

— who it's for

→Developers converting between API date formats
→Data analysts reconciling dates from different export sources
→DevOps engineers reading log timestamps in different zones
→Anyone confused by a date that could mean January 3rd or March 1st

— how to use it

01 Open the Date Format Converter

02 Paste or type a date in any format

03 The tool detects the format and shows all equivalents

04 Select a timezone if needed

05 Click any output row to copy that format

06 For batch conversion, switch to Batch tab, paste your dates, and pick the target format

— at a glance

Category	Dev Tools
Cost	Free
Sign-in required	No
Files uploaded	Never — runs in your browser
Published	May 11, 2026

— frequently asked questions

How does it know what format my date is in?

It tries a priority-ordered list of common formats and picks the first one that produces a valid date. You can also override the detected format.

Does it handle ambiguous dates like 01/02/03?

Ambiguous dates are flagged. You can specify which interpretation to use.

Can I convert between timezones?

Yes — set the input timezone (if different from UTC) and the output timezone. All displayed formats reflect the conversion.

What is the difference between Unix seconds and Unix milliseconds?

Unix seconds (epoch) count seconds since Jan 1 1970 UTC; Unix milliseconds count thousandths of a second. JavaScript's Date.now() returns milliseconds.

Is this free?

Yes — free with no sign-in.

— ready to use it?

Free, instant, no sign-in required. Opens directly in your browser.

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