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Horodatage Unix vers date

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

Timestamp → date & time

10 digits = seconds · 13 digits = milliseconds (auto-detect explains which it used).

Comment ça marche

  1. A timestamp marks one exact instant; the unit (seconds or milliseconds) tells how finely it counts since 1970-01-01T00:00:00Z.
  2. Auto-detect labels its choice: values under 100,000,000,000 are read as seconds, larger values as milliseconds, and the note under the result tells you which was applied.
  3. The decoded instant is rendered in UTC and in your browser’s local zone, so an instant near midnight is never mistaken for “the wrong day”.

Bon à savoir

  • Negative values decode normally; -1 is one second before the epoch (1969-12-31 23:59:59 UTC).
  • Range limit: ±8,640,000,000,000,000 ms (the JavaScript Date limits, about years −271,821 to 275,760). Values outside are rejected, not wrapped.
  • Fractional seconds are rounded to the nearest millisecond, and the note says so.
Outils d’horodatageEn vedette

Convertisseur d’horodatage Unix

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

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Outils d’horodatage

Millisecondes vers date

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

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Outils d’horodatage

Convertisseur d’horodatage UTC

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

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Outils d’horodatage

Convertisseur ISO 8601

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

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Foire aux questions

How do I know if my timestamp is seconds or milliseconds?
Count the digits: 10 digits (e.g. 1700000000) is seconds; 13 digits (1700000000000) is milliseconds. Auto-detect states which unit it applied, without silent guessing.
Why does the UTC date differ from the local date?
A timestamp is one instant; local calendars slice it differently. An instant near midnight UTC can be “yesterday” in New York and “tomorrow” in Tokyo. Both views are shown together.
Are negative timestamps supported?
Yes, pre-1970 instants are negative and decode normally; for example, −1 is one second before the epoch (1969-12-31 23:59:59 UTC).