Epoch Calculator

Seconds, milliseconds, microseconds or nanoseconds since 1970-01-01T00:00:00Z. Negative values are dates before 1970.
Used when converting a date and time into a timestamp.
Accepts 13:45, 1:45 pm or 13:45:30.
0 treats the date and time as UTC. -5 reads it as US Eastern Standard Time. A fixed offset only - no daylight-saving rule is applied.
UTC date and time (RFC 3339)
2023-11-14T22:13:20Z
Epoch and Unix Timestamp Converter
Unix timestamp (seconds)
1,700,000,000 s
Unix timestamp (milliseconds)
1,700,000,000,000 ms
Unix timestamp (microseconds)
1,700,000,000,000,000
UTC date
2023-11-14
UTC time
22:13:20
Weekday (UTC)
Tuesday
Day of the year (UTC)
318
ISO week (UTC)
2023-W46
Date and time at the chosen offset
2023-11-14T22:13:20Z
Date at the chosen offset
2023-11-14
Time at the chosen offset
22:13:20
Timestamp unit used
seconds
Whole days since the epoch
19,675 days
Summary
Timestamp 1700000000 seconds since the epoch = 2023-11-14T22:13:20Z (Tuesday).
Worked out from IEEE Std 1003.1-2017 (POSIX.1-2017), Base Definitions ยง4.16, Seconds Since the Epoch and 3 other sources.

How this is worked out

3 steps
  1. 1700000000 has magnitude 1.70e+9, which falls in the seconds band, so it is read as 1700000000 seconds since the epoch.
  2. floor(1700000000 / 86400) = 19675 whole days, remainder 80000 s = 22:13:20.
  3. Day 19675 after 1970-01-01 is 2023-11-14, a Tuesday.

Results are general information, not financial, tax, legal, medical or engineering advice.