A timestamp is the number of seconds (or milliseconds) since 1970-01-01 00:00:00 UTC, uniquely marking a moment. Unix timestamps ignore leap seconds.

How do I tell seconds from milliseconds?

A 10-digit value is usually seconds, a 13-digit value is milliseconds. Milliseconds are roughly 1000x larger.

Why do different tools show different results?

Usually a timezone mismatch. A timestamp itself is timezone-free; a timezone offset must be applied to display it as local time.

Online Timestamp Converter

Simple & fast Unix timestamp converter · seconds / milliseconds · batch conversion · days between dates

Local Time

Unix Timestamp (seconds)

Unix Timestamp (ms)

⤵ Timestamp → Date & Time

Enter a timestamp (auto-detects seconds / milliseconds); the live clock above updates to match

Enter Timestamp

Supports seconds (10-digit) or milliseconds (13-digit), auto-detected

Result

⤴ Date & Time → Timestamp

Pick a date & time to get its second and millisecond timestamps

Pick date & time

Parsed in your local timezone

Result

📋 Common Date Formats

Enter a timestamp or use the current time to view common formats

± Offset Calculation

Add or subtract a value from the current time to get the target timestamp

Value

Unit

Direction

Result

≡ Batch Timestamp Conversion

One timestamp per line, mixed seconds / milliseconds supported, auto-detected

Enter Timestamps (one per line)

Seconds or milliseconds supported, auto-detected

Tip

Conversion Preview

Original	Converted (local time)	Status

◎ Days Between Dates

Calculate the number of days between two dates (natural days, ignoring time)

Start date

End date

Result

Days between--

Including both end days--

⌘ Get Timestamp by Language

How to get the current Unix timestamp in different languages

? What is a Timestamp?

A timestamp is data that proves a piece of information existed at or before a particular point in time. It is usually a character sequence that uniquely marks a moment.

The Unix timestamp (Unix epoch / Unix time / POSIX time) is the number of seconds since 1970-01-01 00:00:00 UTC, ignoring leap seconds. 1 hour = 3600 seconds, 1 day = 86400 seconds.

Timestamps are widely used for storing dates in code, API signatures, caching & rate limiting, ordering and indexing - a universal time-exchange format between frontend and backend.

🕒 Timezone & DST Notes

This tool converts using your browser's local timezone (defaults to Beijing time, UTC+08:00).

DST history: China observed daylight saving for six periods from 1986 to 1991, each year from 2:00 on the 2nd Sunday of April to 2:00 on the 2nd Sunday of September (Beijing time). It was discontinued in 1992. Keep this in mind when converting historical timestamps.

Timezone rules change from time to time; programs rely on the tzdata database to sense these changes. When comparing historical times across systems, use the same tzdata version.

✋ FAQ

A timestamp is the count of seconds (or ms) since 1970-01-01 00:00:00 UTC - a machine-readable time. A date-time is human-readable text. The two convert into each other.

Usually a 10-digit number is seconds and a 13-digit number is milliseconds. Milliseconds are roughly 1000x larger. Divide by 1000 to check if it still looks like a valid time.

Usually a timezone mismatch. A timestamp itself is timezone-free (always based on UTC); when displayed as local time, a timezone offset must be applied. Make sure the timezone is the same.

Best practice: always store UTC timestamps and convert to local time only in the presentation layer. When exchanging historical times across systems, use the same tzdata version to avoid DST differences.