Unified Extensible Firmware Interface
UEFI provides time services. Time services include support for someone's time zone and daylight saving fields, which allow the hardware's real-time clock to be set to local time or UTC. On machines using a PC-AT real-time clock, by default the hardware clock still has to be set to local time for compatibility with BIOS-based Windows, unless using recent versions and an entry in the Windows registry is set to indicate the use of UTC.