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Millisecondes vers date

Convertissez les timestamps à 13 chiffres exprimés en millisecondes en dates compréhensibles.

Milliseconds → date & time

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

Comment ça marche

  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.

Bon à savoir

  • 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.
Outils d’horodatage

Horodatage Unix vers date

Convertissez des horodatages numériques en dates claires avec affichage UTC et local.

Ouvrir l’outil
Outils d’horodatageEn vedette

Convertisseur d’horodatage Unix

Convertissez les timestamps Unix en dates lisibles et les dates en horodatages en secondes ou millisecondes.

Ouvrir l’outil
Outils d’horodatage

Convertisseur ISO 8601

Convertissez dates et horodatages en chaînes conformes à la norme ISO 8601.

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Outils d’horodatage

Convertisseur d’horodatage UTC

Convertissez les timestamps directement en dates et heures au format UTC pur.

Ouvrir l’outil

Foire aux 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.