Daylight Saving Time Begins (at 2 a.m.)

For jurisdictions that adopt Daylight Saving Time (DST), clocks should be set forward by one hour at 2 a.m. local time on Sunday, March 9. For stargazers, the time change, and the fact that sunsets occur 1 minute later each day near the March equinox, will mean that dark-sky observing cannot commence until much later in the evening – possibly after the bedtime of junior astronomers. The difference from local time to Greenwich Mean Time (GMT) and the astronomers’ Universal Time (UT) decreases by one hour when DST is in effect. Daylight Saving Time will end on November 2, 2025.