GPS Time Converter

Convert GPS week and seconds to UTC or GPS-scale date/time. Resolve truncated week numbers with an explicit rollover cycle.

Starts with an editable example. Replace the dates and rules with your own.

Your calculation

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Choose your dates.

Select your counting rules and calculate.

How to use this calculator

Select full week or 10-bit week plus cycle, enter seconds of week, and choose UTC or continuous GPS time. Reverse conversion accepts milliseconds.

UTC conversion uses the bundled leap-second table and is limited to January 6, 1980 through December 31, 2026. GPS-scale dates extend through 2100. Known leap-second labels are handled explicitly; a 10-bit week never chooses its cycle automatically.

A worked example

GPS week 2443, second 304218 converts to November 4, 2026 at 12:30:00 UTC, using an 18-second GPS-minus-UTC offset.

Why does UTC conversion stop at the end of 2026?

Future leap-second decisions are external data. The fixed coverage boundary prevents silently extending the current offset beyond the reviewed period.

Which calendar and years are supported?

Each result states its calendar, time scale, precision and supported range. Batch converters accept up to 100 nonempty input lines and retain invalid rows. Copy, CSV and print include the calculation rules. Calendar downloads appear when a result contains dated events. Calculations run in your browser; no reminders or jobs are scheduled.

What happens to my dates?

Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.