Date.now().Z.+10:00.All four describe the same instant. Only the wall-clock display changes.
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Anyone with this link can read the values it contains. Do not use it for sensitive data.
A Unix timestamp (also called epoch time) is the number of seconds since 1970-01-01 00:00:00 UTC. It's compact and timezone-free, which makes it ideal for storing and comparing moments in code and databases.
ISO 8601 is the human-and-machine-friendly text format for the same instant. It reads YYYY-MM-DDThh:mm:ssZ, where the trailing Z means UTC and an offset like +05:30 shifts it into a local timezone. For example, epoch 1700000000 is 2023-11-14T22:13:20Z in ISO 8601.
| Unix timestamp | ISO 8601 (UTC) | What it is |
|---|---|---|
| 0 | 1970-01-01T00:00:00Z | The Unix epoch (time zero) |
| 1000000000 | 2001-09-09T01:46:40Z | One billion seconds |
| 2147483647 | 2038-01-19T03:14:07Z | The 32-bit "Year 2038" limit |
Pick an IANA timezone to see the same instant in local time. Common ones: Asia/Kolkata for IST, America/New_York for Eastern, America/Los_Angeles for Pacific, Europe/London for GMT/BST, and UTC itself. The zoned ISO output carries the correct offset, including daylight saving where it applies.