How can I tell whether a timestamp is in seconds or milliseconds?
Select the unit explicitly. Current Unix timestamps are usually 10 digits in seconds or 13 digits in milliseconds.
Timestamp Converter
v2 secureDeveloper Utility
Unix Timestamp Converter - Convert Epoch Time to Date
Convert Unix timestamps to local time, UTC, and ISO 8601, or convert a date and time to Unix seconds and milliseconds.
Current Unix timestamp
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Negative values represent dates before January 1, 1970. Decimal seconds are accepted and rounded down to millisecond precision.
Convert Unix epoch timestamps in seconds or milliseconds into local time, UTC, and ISO 8601, or select a date and time to get both timestamp units.
Date and time inputs can be interpreted in your browser's local timezone or UTC. Conversion happens locally in your browser.
How to Use This Tool
- Choose Timestamp to date or Date to timestamp.
- Enter a timestamp and select seconds or milliseconds, or choose a date and time.
- For date inputs, choose whether to interpret the value in local time or UTC.
- Review local, UTC, ISO 8601, and Unix timestamp results, then copy individual values or all results.
Unix Timestamp Seconds and Milliseconds
A Unix timestamp is the number of elapsed seconds from January 1, 1970 at 00:00:00 UTC. Many programming APIs use milliseconds instead, so select the unit to avoid interpreting the date at the wrong scale.
This converter displays both seconds and milliseconds for each date. Negative timestamps represent dates before the Unix epoch, and sub-millisecond precision is discarded.
Local Time, UTC, and ISO 8601
The same instant can appear as different wall-clock times in different timezones. Local output uses the timezone configured by your browser; UTC output is normalized to Coordinated Universal Time.
ISO 8601 output includes the UTC designator (Z), making it unambiguous when shared between systems. Date inputs allow either local timezone or UTC interpretation, and nonexistent local times during daylight-saving changes are rejected.
Frequently Asked Questions
Does local time use my computer's timezone?
Yes. Local output and local date input use the timezone configured in your browser. You can also interpret date input as UTC.
What is the ISO 8601 result?
It is an unambiguous UTC date-time string ending in Z, for example 2023-11-14T22:13:20.000Z.
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