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Milliseconds to Date

Convert 13-digit epoch milliseconds into readable dates.

Milliseconds → date & time

13 digits is typical today; fractional values are rounded to the nearest millisecond.

How it works

  1. Epoch milliseconds count milliseconds since 1970-01-01T00:00:00Z, the unit used by Java, JavaScript, .NET and most web APIs. A current value has 13 digits (≈ 1.7 × 10¹²).
  2. The value is rounded to the nearest whole millisecond when it has a fraction (JavaScript Date precision is 1 ms), then decoded to an exact UTC instant.
  3. The same instant is shown in UTC and your local zone, plus the equivalent 10-digit epoch seconds for cross-checking.

Good to know

  • This page always reads input as milliseconds. A 10-digit value like 1700000000 is seconds; feeding it here produces a 1970-era date. Use the Unix Timestamp Converter when the unit is uncertain.
  • UTC and local dates can differ by a day around midnight; both are shown to make that visible instead of surprising.
  • The full JavaScript Date range (±8.64×10¹⁵ ms) is supported; beyond it the value is rejected with an explanation.
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Frequently asked questions

Which systems use millisecond timestamps?
Java, JavaScript, .NET, and most web APIs and log formats. If your value has 13 digits and is around 1.7 trillion, it is almost certainly milliseconds.
Can I enter fractional milliseconds?
You can enter decimals, and the tool rounds to whole milliseconds explicitly. JavaScript Date precision is one millisecond, so finer detail cannot be represented.
Why is the result a day off from my log’s date?
Log viewers often show UTC while you expect local time (or vice versa). The converter shows both UTC and your local zone so the discrepancy is visible instead of confusing.