No Daylight Saving Time in UTCĭaylight Saving Time (DST) is not used for UTC as it is a time standard for all time zones. The National Institute of Standards and Technology - Time and Frequency Division maintains the standard for frequency and time interval for the United States, provides official time to the United States, and carries out a broad program of research and service activities in time and frequency metrology. However, many time zone boundaries are distorted by geographical and political factors.

In theory, the UTC offsets countries use should reflect the local mean solar time. Two time components are added together to translate mean solar time to Coordinated Universal Time (UTC): International Atomic Time (TAI) measured by atomic clocks and Universal Time (UT1), the actual length of a day on Earth. For every 15 degrees of longitude east or west, mean solar time changes by 1 hour. Primarily, UTC is based on mean solar time at the prime meridian running through Greenwich, UK. The offset is expressed as either UTC- or UTC+ and the number of hours and minutes. All time zones are defined by their offset from UTC. The time zones in the contiguous United States are often referred to by their generic name, without making a difference between standard time and DST designations. UTC-Coordinated Universal Time-is the 24-hour time standard used as a basis for civil time today. UTC-4 is a fixed time zone that never observes Daylight Saving Time.

The graph above shows that there is no clock change in UTC during 2023. Time/General Time Zone DST Changes 05:19:07 UTC-4. They will become active again after the next clock change as Daylight Saving Time begins or ends. Business Date to Date (exclude holidays) The above time zones are used during other parts of the year.

Current utc time zone