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NMEA0183
14.7.7
ZDA - Time & Date
The ZDA message contains UTC, the day, the month, the year and the
local time zone.
$GPZDA,hhmmss.ss,xx,xx,xxxx,,*hh<CR><LF>
Table B.11
ZDA - Time & Date Message Parameters
Field #
Description
1
UTC (when UTC offset has been decoded by the receiver)
2
Day (01 to 31)
3
Month (01 to 12)
4
Year
5
unused
6
unused
hh
Checksum
Note – Fields #5 and #6 are null fields in the Copernicus GPS Receiver
output. A GPS receiver cannot independently identify the local time zone
offsets.
Warning – If UTC offset is not available, time output will be in GPS time until
the UTC offset value is collected from the GPS satellites. When the offset
becomes available, the time will jump to UTC time.
Note – The time can be used as a timetag for the 1PPS. The ZDA message
comes out 100-500 msec after the PPS.
Copernicus GPS Receiver Reference Manual 179