Explained with a live converter, reference tables, charts, and a step-by-step guide.
Enter a Unix timestamp (seconds since 1970-01-01 UTC) to see the matching calendar date and time in UTC.
A Unix timestamp counts the seconds since the Unix epoch: January 1, 1970 at 00:00:00 UTC. The value carries no time zone — it is always expressed in UTC. For local time, shift the result by your UTC offset.
Leap seconds are not counted in Unix time, so every day is exactly 86,400 seconds. Older systems store the value as a signed 32-bit integer, which overflows in January 2038.
| Timestamp | Date (UTC) | Note |
|---|---|---|
| 0 | 1970-01-01 00:00:00 UTC | The Unix epoch |
| 1000000000 | 2001-09-09 01:46:40 UTC | One billion seconds |
| 1700000000 | 2023-11-14 22:13:20 UTC | Example timestamp |
| 2147483647 | 2038-01-19 03:14:07 UTC | 32-bit signed limit |
For quick reference: every whole hour in 24-hour and 12-hour format.
| Military time | Standard time |
|---|---|
| 0000 | 12:00 AM |
| 0100 | 1:00 AM |
| 0200 | 2:00 AM |
| 0300 | 3:00 AM |
| 0400 | 4:00 AM |
| 0500 | 5:00 AM |
| 0600 | 6:00 AM |
| 0700 | 7:00 AM |
| 0800 | 8:00 AM |
| 0900 | 9:00 AM |
| 1000 | 10:00 AM |
| 1100 | 11:00 AM |
| 1200 | 12:00 PM |
| 1300 | 1:00 PM |
| 1400 | 2:00 PM |
| 1500 | 3:00 PM |
| 1600 | 4:00 PM |
| 1700 | 5:00 PM |
| 1800 | 6:00 PM |
| 1900 | 7:00 PM |
| 2000 | 8:00 PM |
| 2100 | 9:00 PM |
| 2200 | 10:00 PM |
| 2300 | 11:00 PM |
A time format only decides how a moment is written — not when it happens. Military time, standard time, Unix timestamps, and decimal time are different notations for the same information.
Converting between them is therefore exact and never changes. The only rounding is in decimal time, where seconds are rounded to whole minutes.
Military time is used by the military, aviation, hospitals, and emergency services because it is unambiguous. Unix timestamps live in databases, log files, and APIs. Decimal time appears on timesheets and in payroll.
Enter a Unix timestamp (seconds since 1970-01-01 UTC) to see the matching calendar date and time in UTC.
The Unix epoch is the zero point of the count: January 1, 1970 at 00:00:00 UTC. A Unix timestamp is the number of seconds that have elapsed since then.
A Unix timestamp is always UTC — it carries no time zone. For local time, shift the result by your UTC offset. Leap seconds are not counted in Unix time.
Yes. Converting between time formats is a pure notation change — the same moment, just written differently. There is no rounding except minute-rounding for decimal time.
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The time format converter covers military time, Unix timestamps, and decimal time with tables and charts.