Il timestamp è in secondi o millisecondi?

Dipende dal sistema che lo genera: Unix/Linux e molti database usano i secondi, mentre JavaScript usa i millisecondi. Lo strumento supporta entrambi i formati per evitare errori di conversione.

Come faccio a convertire una data specifica in timestamp?

Puoi inserire data e ora nel formato richiesto e lo strumento calcola immediatamente il timestamp Unix corrispondente, gestendo anche il fuso orario selezionato.

Lo strumento supporta il formato ISO 8601?

Sì, oltre alla conversione classica in data leggibile, lo strumento supporta anche l'output e l'input nel formato ISO 8601, comune in molte API e sistemi di log.

Free Online Unix Timestamp Converter

What is a Unix timestamp?

The Unix timestamp (or Epoch time) is the number of seconds elapsed since January 1, 1970 00:00:00 UTC. JavaScript uses milliseconds (Date.now()), Firebase RTDB uses milliseconds, while many APIs use seconds. Knowing which unit you're using is key to avoiding 1000x bugs.

To recognize the format: a 10-digit timestamp is in seconds (e.g. 1750000000), a 13-digit one is in milliseconds (1750000000000). This converter automatically detects the format.

How does Firebase handle timestamps?

Firebase RTDB and Firestore use different approaches. RTDB uses firebase.database.ServerValue.TIMESTAMP which stores Unix milliseconds. Firestore uses firebase.firestore.FieldValue.serverTimestamp() which produces a Timestamp object with .toDate() and .toMillis() methods.

When to use a Unix timestamp converter

This tool converts a Unix timestamp to a readable date and back, in real time, supporting milliseconds, time zones, and ISO 8601 format — useful for debugging and development.

When to use it

You need to read a Unix timestamp found in a log, a database, or an API response, converting it to a readable date.

You need to generate a Unix timestamp from a specific date to use in code or a query.

You need to check whether a timestamp is expressed in seconds or milliseconds, a common source of errors.

When NOT to use it

You need to run complex calculations across many dates (differences, recurrences): for batch processing, a programming language with a date library is better suited than a single conversion.

Alternatives

Native functions in your programming language (e.g. new Date() in JavaScript, datetime in Python) when the conversion is needed inside code, not as a manual check.

Our time zone converter when you need to compare the same moment across several locations, not just convert a single timestamp.

Common mistakes

Confusing timestamps in seconds with timestamps in milliseconds: JavaScript uses milliseconds, many Unix/Linux systems use seconds, causing dates that are off by orders of magnitude if not converted correctly.

Not accounting for time zone when converting a timestamp, wrongly assuming it always matches your device's local time.

Frequently asked questions about timestamp conversion

It depends on the system that generates it: Unix/Linux and many databases use seconds, while JavaScript uses milliseconds. The tool supports both formats to avoid conversion errors.

You can enter the date and time in the required format and the tool immediately calculates the corresponding Unix timestamp, also handling the selected time zone.

Yes, in addition to standard conversion to a readable date, the tool also supports ISO 8601 as both output and input, common in many APIs and logging systems.

⏱️ Timestamp Converter