Base64 Encoder / Decoder
Encode UTF-8 text to Base64 or decode Base64 back to text, locally.
DeveloperProcessed locally
Unix Timestamp Converter
Convert Unix timestamps in seconds or milliseconds to UTC dates, and timezone-stamped ISO dates back.
Processed on this page. No uploads. Your input is not saved.
How timestamp units work
Unix timestamps count time from 1970-01-01 UTC. Seconds and milliseconds differ by a factor of 1,000; choose the unit explicitly. Results include a UTC ISO date and both timestamp units.
Why must the date include a timezone?
A local clock time can refer to different instants in different timezones. Enter an ISO 8601 date and time ending in Z or an explicit offset such as +08:00. This tool does not guess your device timezone or handle leap seconds.
Convert a log timestamp to a UTC date
Paste the integer timestamp, select seconds or milliseconds, then convert. To go the other way, enter an ISO date and time with Z or an explicit offset such as +08:00.
Example and expected result
1700000000 seconds is 2023-11-14T22:13:20.000Z. The ISO value 2023-11-15T06:13:20+08:00 converts back to 1700000000 seconds and 1700000000000 milliseconds. A local date without a timezone is rejected rather than guessed.