Why this tool stays in the browser
Convert Unix timestamps to human-readable dates and back without a timezone API call. Seconds vs milliseconds is an explicit toggle so JavaScript Date values and POSIX time are not mixed up. All math is in the tab. Use it when logs, JWTs, or database columns disagree on epoch units. Cron expressions and timezone planning live in adjacent tools if you are scheduling rather than converting a single instant.
Related: Cron Generator · Timezone Planner
FAQ
- Does this hit a timezone API?
- No. Conversion is local. Use Timezone Planner when you need meeting overlap across zones.
- Seconds or milliseconds?
- Toggle explicitly. Mixing POSIX seconds with JS milliseconds is the usual off-by-1000 bug in logs and JWTs.
- Can I convert ISO-8601 strings?
- Yes — parse a date string to Unix time and back in the same page.
Timestamp Converter
Convert between Unix timestamps and human-readable dates with timezone support.
Current Time
Unix (seconds)
1793020915Unix (milliseconds)
1793020915765ISO 8601
2026-10-26T13:21:55.765ZTimestamp to Date
Date to Timestamp
Quick Reference
Seconds: Standard Unix timestamp
Milliseconds: JavaScript Date value
ISO 8601: International standard format