Timestamp Converter
Sec/ms, 11 timezones, batch conversion
Current Time (Live)
Timestamp → Date-Time
| City | Date-Time |
|---|
Date-Time → Timestamp
Batch Conversion
Time Unit Conversion
Quick Offset
How to Use
A Unix timestamp counts seconds (13 digits for milliseconds) since 1970-01-01 00:00:00 UTC and shows up everywhere in logs, databases and API payloads. This single page covers the whole daily routine: auto-detecting seconds vs milliseconds, two-way conversion between local time and UTC, ISO 8601 and RFC 2822 output, weekday and relative time, a live comparison across 11 major world timezones, plus batch conversion, time-unit conversion and quick date offsets.
How to use: the live clock at the top refreshes the current seconds/milliseconds timestamp every second. Paste a number into the Timestamp to Date-Time box for multiple formats and per-city times, or force seconds/milliseconds with the radio buttons; pick a local date-time to build the timestamp in reverse; the batch box takes one timestamp per line and skips blank lines; unit conversion and offsets update live. Everything runs locally in your browser, with nothing uploaded.
FAQ
How does batch conversion work?
Enter one timestamp per line: 10 digits are read as seconds and 13 or more as milliseconds, while blank lines are skipped. Each output line reads "timestamp ⇒ date-time"; unrecognized lines keep the original value and are flagged as invalid. Copy all results with one click.
Which cities are in the timezone table, and why do times differ?
The table lists 11 zones: Beijing/Shanghai, Hong Kong, Tokyo, Singapore, New Delhi, London, Paris, New York, Los Angeles, Sydney and UTC. A timestamp itself is timezone-free, the same instant has the same value worldwide; the zone only decides how it is displayed, e.g. Beijing is 8 hours ahead of UTC.
What do the unit converter and quick offset do?
The converter converts live among milliseconds, seconds, minutes, hours and days, just enter an amount and pick the source unit (fractional results keep up to 4 decimals). Quick offset calculates a date-time before or after the current moment by any number of days, hours or minutes, instantly giving the local date-time and its seconds timestamp.