What is GMT/UTC time?

The time is indicated on maps as "DATE HHgmt", representing the Greenwich (Universal) time zone.
Danish local time is GMT time plus 1 hour (winter).
Danish daylight saving time is GMT time plus 2 hours (summer).

Examples:
13gmt = 14 danish time (winter)
13gmt = 15 danish time (summer)

GMT is an abbreviation of Greenwich Mean Time, and is also called UTC (Universal Time, Coordinated) or Z (Zulu Time).