Purpose and scope
What this technical calculator produces
Convert UTC time into GPS week and seconds-of-week using an entered offset.
The GPS Week and Time-of-Week Converter models a readable value from UTC timestamp and GPS−UTC offset seconds; Hold GPS−UTC offset seconds beside the copied output.
Instructions
How to use this calculator
Establish UTC timestamp and GPS−UTC offset seconds from the GPS Week and Time-of-Week Converter entered scenario, then cross-check GPS−UTC offset seconds with the required technical convention.
- Establish UTC timestamp and GPS−UTC offset seconds exactly as supplied by the entered scenario.
- Model the GPS Week and Time-of-Week Converter conversion and cross-check GPS−UTC offset seconds with the copyable output.
Calculation
Method used
The entered offset is added to elapsed UTC seconds since the GPS epoch before week division.
The GPS Week and Time-of-Week Converter relates UTC timestamp and GPS−UTC offset seconds to the converted value; hold the GPS−UTC offset seconds precision or unit convention.
Calculation method last reviewed: June 21, 2026.
Worked scenario
Example calculation
Cross-check the GPS Week and Time-of-Week Converter worked value with GPS−UTC offset seconds, then validate its precision and format.
Interpretation
Validating the generated output
The entered offset is essential because GPS time does not insert UTC leap seconds.
Validate the GPS Week and Time-of-Week Converter output against GPS−UTC offset seconds before sending its unit, epoch, or syntax elsewhere.
For a separate check, the Julian Date and Modified Julian Date Converter is designed to convert a UTC timestamp into Julian Date and Modified Julian Date.
Boundaries
Important edge cases and limitations
The GPS−UTC offset changes after leap seconds; rollover interpretation and receiver behavior are outside the conversion.
Refresh the GPS Week and Time-of-Week Converter convention when GPS−UTC offset seconds uses another epoch, precision, or syntax rule.
Input audit
Checklist for this calculation
- Validate the GPS Week and Time-of-Week Converter unit or epoch in UTC timestamp and GPS−UTC offset seconds.
- Cross-check GPS−UTC offset seconds with the GPS Week and Time-of-Week Converter copyable output.
Questions
Frequently asked questions
Why is GPS time ahead of UTC?
GPS time runs continuously while UTC occasionally inserts leap seconds.
Which inputs make a gps week and time-of-week converter result reproducible?
Another reviewer needs UTC timestamp and GPS−UTC offset seconds and GPS−UTC offset seconds to recreate the GPS Week and Time-of-Week Converter. Store those values with their units and generation date.
What event should trigger another gps week and time-of-week converter calculation?
Reconsider the GPS Week and Time-of-Week Converter when GPS−UTC offset seconds no longer matches the source used for UTC timestamp. A new calculation keeps the cases separate.