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Unix Timestamp Calculator

Convert a date and time into a Unix timestamp.

About Unix Timestamp Calculator

A Unix timestamp counts seconds since the epoch in UTC, which makes it unambiguous across time zones. Signed 32-bit storage overflows in January 2038, which is why 64-bit timestamps are now standard. Storing times as timestamps rather than local strings eliminates an entire class of time zone and daylight saving bugs.

Formula

Unix Timestamp

Timestamp = days since 1 January 1970 × 86,400 + seconds within the day

Unix epoch
Midnight UTC on 1 January 1970
year 2038 problem
A signed 32-bit timestamp overflows in January 2038

Worked example

With the default values below, Unix Timestamp Calculator returns Unix Timestamp of 1,749,997,800. Change any input above and every figure here is recalculated in your browser.

Inputs used

Date yearaccepts 1,970–2,200
2,025
Date monthaccepts 1–12
6
Date dayaccepts 1–31
15
Hour in UTCaccepts 0–23 h
14 h
Minuteaccepts 0–59 min
30 min

Results

Unix Timestamp
1,749,997,800 s
Unix Timestamp in Milliseconds
1,749,997,800,000 ms
Days Since the Epoch
20,254 days
Day of the Week
Sunday
Years Until the 32-Bit Overflow
12.60 years

Step by step

  1. 1Values used
  2. 2Unix Timestamp
  3. 3Unix Timestamp= 1,749,997,800 s
  4. 4Unix Timestamp in Milliseconds= 1,749,997,800,000 ms
  5. 5Days Since the Epoch= 20,254 days
  6. 6Day of the Week= Sunday
  7. 7Years Until the 32-Bit Overflow= 12.60 years

Assumptions and limits

  • The result is derived only from the 5 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Unix Timestamp calculated?

Timestamp = days since 1 January 1970 × 86,400 + seconds within the day A Unix timestamp counts seconds since the epoch in UTC, which makes it unambiguous across time zones. Signed 32-bit storage overflows in January 2038, which is why 64-bit timestamps are now standard.

Why does Unix Timestamp matter?

Storing times as timestamps rather than local strings eliminates an entire class of time zone and daylight saving bugs.

What values do I need to enter?

This calculator takes 5 inputs: Date year, Date month, Date day, Hour in UTC, Minute. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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