BeiDou, GLONASS & Galileo Time Converter

Q: What is BeiDou time (BDT)?

Continuous time since **2006-01-01 00:00:00 UTC**, counting weeks and seconds. BDT = UTC + 4 s (2026), ignoring leap seconds.

Q: What is GLONASS time?

Based on **UTC+3 (Moscow)** and synchronized with UTC via a 3-hour offset: GLONASS ≈ UTC + 3 h. It uses a 2-digit year and day-of-year encoding.

Q: What is Galileo system time (GST)?

Continuous since **1999-08-22**, aligned to TAI: GST = TAI. GST = UTC + 37 s (2026). It uses week numbers modulo 4096.

Each satellite navigation system runs its own time scale: BeiDou (BDT, since 2006-01-01), GLONASS (GLONASS time since 1996, linked to UTC+3), and Galileo (GST, since 1999-08-22, aligned to TAI). Interoperability requires converting between them.

This converter renders your date-time in each GNSS system time — week counts, seconds, and the offset from UTC — for receiver development and test vectors.

Timezone:

Enter a date-time above to see the conversion results.

BeiDou, GLONASS & Galileo Time Converter Quick Reference

Format	Pattern / Description	Example 1	Example 2
BeiDou Time	Seconds since 2006	1786620600	1767214800
GLONASS Time	Moscow Time	1786620600	1767214800
Galileo System Time	Seconds since 1999	851351400	831945600

* Examples are rendered in UTC for the fixed sample instants above.

When to Use BeiDou, GLONASS & Galileo Time

GNSS receiver development

Generate BeiDou week/TOW and Galileo GST values as test vectors for multi-constellation receivers.

PVT algorithm testing

Convert UTC to each system time when validating position/velocity/time solutions across constellations.

Time offset studies

Compute BDT/GST offsets from UTC for interoperability analysis.

Frequently Asked Questions

What is BeiDou time (BDT)?

Continuous time since 2006-01-01 00:00:00 UTC, counting weeks and seconds. BDT = UTC + 4 s (2026), ignoring leap seconds.

What is GLONASS time?

Based on UTC+3 (Moscow) and synchronized with UTC via a 3-hour offset: GLONASS ≈ UTC + 3 h. It uses a 2-digit year and day-of-year encoding.

What is Galileo system time (GST)?

Continuous since 1999-08-22, aligned to TAI: GST = TAI. GST = UTC + 37 s (2026). It uses week numbers modulo 4096.

How are GNSS times converted to UTC?

Add the constellation's offset: GST/BDT add the current TAI−UTC difference (+37 s), GLONASS subtracts 3 h then applies leap-second corrections from the message.

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