How should the Time Zone Offset from UTC handle daylight savings time?
NOTE: This guidance was rescinded on March 10, 2022, and is no longer in effect. Please see revised guidance FMCSA-HOS-ELD-TECH-395-FAQ26(2022-03-10).
Frequently Asked Questions: Electronic Logging Devices and Hours of Service – Technical Specifications
Question: How should the Time Zone Offset from UTC handle daylight savings time?
Guidance: The rule calls for storing date/time information using UTC and transmitting data in the data file using the UTC offset in effect at the carrier’s home terminal. This means that when daylight saving’s time is in effect at the home terminal, it should be included in the UTC offset. It would not be included in the UTC offset if daylight savings time is not in effect at the home terminal.