Epoch Timestamp To Date
Convert an epoch / Unix timestamp into a human readable date and vice-versa. Displays the current epoch time in seconds, milliseconds and microseconds.
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Epoch and Unix timestamps explained
What is the Unix epoch?
The Unix epoch is the instant January 1, 1970 at 00:00:00 UTC. A Unix timestamp is the number of seconds elapsed since that instant, not counting leap seconds.
Seconds, milliseconds, microseconds or nanoseconds?
JavaScript's Date.now() and most JSON APIs return milliseconds (13 digits). A timestamp in the wrong unit is off by a factor of 1,000.
The year 2038 problem
Systems that store the timestamp as a signed 32-bit integer can only count up to 2,147,483,647 seconds, which corresponds to 2038-01-19 03:14:07 UTC. Modern systems use 64-bit integers.
How to get the current epoch time
| Language | Seconds | Milliseconds |
|---|---|---|
| JavaScript | Math.floor(Date.now() / 1000) |
Date.now() |
| Python | import time; int(time.time()) |
time.time_ns() // 1_000_000 |
| PHP | time() |
(int) round(microtime(true) * 1000) |
| Java | Instant.now().getEpochSecond() |
System.currentTimeMillis() |
| Bash | date +%s |
date +%s%3N |