Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and times, and vice versa.
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How to use this calculator
- 1
Choose the conversion direction.
- 2
Enter a Unix timestamp (like 1700000000) or a date string (like 2023-11-14T22:13:20).
- 3
The converted value appears immediately.
- 4
Use "Current timestamp" to get the exact current Unix time.
Frequently asked questions
What is a Unix timestamp?
A Unix timestamp is the number of seconds (or milliseconds) since January 1, 1970 00:00:00 UTC (the Unix epoch). It is timezone-independent and used universally in programming for date/time storage.
How do I know if a timestamp is in seconds or milliseconds?
Timestamps in seconds are typically 10 digits (e.g. 1700000000). Millisecond timestamps are 13 digits (e.g. 1700000000000). The converter auto-detects which you entered.
What is the Year 2038 problem?
Traditional Unix timestamps stored as 32-bit signed integers overflow on January 19, 2038 (timestamp 2147483648). Modern systems use 64-bit integers which will not overflow for billions of years.
Unix timestamps: the universal language of time in computing
Why timestamps instead of dates?
Timestamps are timezone-independent integers — easy to store, compare, and sort. "2023-11-14T22:13:20+05:30" vs "2023-11-14T16:43:20Z" both equal timestamp 1700000000. Databases, APIs, and logs all benefit from using a single numeric reference point.
ISO 8601 format
ISO 8601 is the international standard for date/time strings: YYYY-MM-DDTHH:MM:SSZ. The Z suffix means UTC. +05:30 means 5 hours 30 minutes ahead of UTC. This format sorts correctly as a string and is unambiguous across locales.
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