How do I know if my timestamp is in seconds or milliseconds?

Ten-digit numbers (around 1.7 billion) are seconds; thirteen-digit numbers are milliseconds. The auto-detect option applies this rule automatically, and the tool shows a note explaining the distinction.

What is the 2038 problem?

Classic 32-bit signed timestamps overflow on 19 January 2038. Modern 64-bit systems and JavaScript's number-based timestamps are unaffected, but the tool flags dates near this boundary as a reminder for legacy systems.

Can I convert a batch of timestamps at once?

Yes, switch to batch mode, paste one timestamp per line, and download all conversions together as a CSV file.

Does it handle timezones correctly?

Yes — pick separate timezones for reading the input and formatting the output, from UTC, your local zone, or a list of major IANA time zones.

Can I calculate the difference between two dates?

Yes, enter two timestamps and the tool shows the difference broken down into years, months, days, hours, minutes and seconds.

ToolMano

Unix timestamp converter

Convert Unix timestamps to dates and back, in any timezone.

No uploadNo signupWorks offline

Timestamp input

Live current timestamp (ticking)

Quick presets

Input unit

Output timezone

Output format

Batch modeLive tick

Enter a Unix timestamp above to see the converted date.

Note: seconds and milliseconds are shown alongside the formatted date. All computation happens locally in your browser using the Intl API for timezones — no network requests are made.

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About unix timestamp converter

Unix timestamp converter turns epoch timestamps into human-readable dates and back, supporting seconds, milliseconds, microseconds and nanoseconds with auto-detection of the unit.

Pick a timezone for input and output from a list of major IANA zones, and get results in ISO 8601, RFC 2822/3339, HTTP date, SQL datetime, relative time ("3 hours ago") or a fully custom pattern.

Beyond simple conversion it includes date arithmetic, a difference calculator with a full breakdown, batch conversion for many timestamps at once, a live ticking clock, and notes on the 2038 problem and detecting seconds vs milliseconds.

How to use Unix timestamp converter

1Paste a Unix timestamp, or pick a date, or use the live 'now' value.
2Choose the input unit and timezone.
3Pick the output format and timezone you need.
4Use date arithmetic or the difference calculator if comparing two moments.
5Copy the result or download a batch of conversions as CSV.

What it does

Seconds / milliseconds / microseconds / nanoseconds, with auto-detection
Timezone picker with major IANA zones plus UTC and local
ISO 8601, RFC 2822, RFC 3339, HTTP date, SQL datetime and custom-pattern output
12/24-hour format, week number, day of year and quarter
Leap-year flag and 2038-problem note
Epoch presets: now, today/tomorrow/week/month/quarter/year start & end
Date arithmetic: add or subtract years, months, weeks, days, hours, minutes, seconds
Difference between two timestamps with a full unit breakdown
Batch conversion, one timestamp per line, with CSV export
Live ticking current timestamp display

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