ISO 8601 Date to Unix Timestamp – Convert UTC Date Online

Local only

Convert an explicit UTC ISO 8601 date into Unix time.

Multi-row timestamp converter

Compare timestamps and ISO 8601 dates. Inputs without an offset use UTC.

Row 1Date -> Timestamp
1705321845
Milliseconds: 1705321845000Timezone: UTC (Z)ISO: 2024-01-15T12:30:45.000Z

ISO 8601 conversion

How do I convert an ISO date to a Unix timestamp?

An ISO 8601 date ending in Z identifies a UTC instant explicitly. Date to Timestamp converts that instant to integer Unix seconds and also shows milliseconds for systems that use the longer unit. This tool is free to use. No account or payment is required.

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What you can do here

  • Unix seconds and milliseconds conversion
  • ISO 8601 parsing
  • Explicit timezone interpretation
  • Fractional and negative Unix timestamps
  • Browser-local processing

Steps

  1. Choose Date to Timestamp.
  2. Paste the ISO 8601 value ending in Z.
  3. Copy the Unix-seconds output or the Milliseconds detail required by your target system.

Z makes the timezone explicit

The Z suffix means UTC. The normalized ISO detail therefore represents exactly the same clock time in UTC.

UTC ISO date conversion

The converter returns Unix seconds and exposes milliseconds separately.

ISO date

2024-01-15T12:30:45Z

Unix seconds

1705321845

Common questions

Frequently asked questions

Does the output use seconds or milliseconds?

The main Date to Timestamp output is Unix seconds. Milliseconds are shown in the details.

What does Z mean?

Z identifies UTC, also called the zero timezone offset.

Recommended next steps

Timestamp Timezone OffsetSee how an explicit ISO timezone offset changes the resulting Unix timestamp.10-Digit Unix TimestampInterpret common 10-digit Unix values as seconds and confirm the ISO date.Unix Timestamp Converter OnlineConvert Unix seconds, milliseconds, ISO 8601 dates, and timezone-aware values locally.

Debugging a specific Timestamp issue? Browse Timestamp troubleshooting.