https://dateandtimetoday.com/blog/Articles on daylight saving time, leap years, ISO week numbers, Unix time and atomic clocks.enhttps://dateandtimetoday.com/blog/the-meeting-that-moved/https://dateandtimetoday.com/blog/the-meeting-that-moved/A London–New York call is usually five hours apart. For a few weeks, it isn’t. Here is how to stop a calendar surprise.Tue, 29 Sep 2026 00:00:00 GMThttps://dateandtimetoday.com/blog/the-23-hour-day/https://dateandtimetoday.com/blog/the-23-hour-day/Tomorrow is one date away. That does not always mean 86,400 seconds. The difference matters in code, travel, and everyday counting.Tue, 29 Sep 2026 00:00:00 GMThttps://dateandtimetoday.com/blog/week-53/https://dateandtimetoday.com/blog/week-53/Week 53 is not a glitch. ISO week dates use a second kind of year, with its own boundary near New Year.Tue, 29 Sep 2026 00:00:00 GMThttps://dateandtimetoday.com/blog/the-century-without-a-leap-day/https://dateandtimetoday.com/blog/the-century-without-a-leap-day/The exception to the exception explains February’s missing day—and why repeating the calendar every four years does not quite work.Tue, 29 Sep 2026 00:00:00 GMThttps://dateandtimetoday.com/blog/a-date-is-not-an-instant/https://dateandtimetoday.com/blog/a-date-is-not-an-instant/A date, a local time, and an instant are three different things. Mixing them is how a harmless form loses a day.Tue, 29 Sep 2026 00:00:00 GMThttps://dateandtimetoday.com/blog/flight-arrives-before-departure/https://dateandtimetoday.com/blog/flight-arrives-before-departure/An arrival time earlier than departure is not time travel. It is two local clocks telling one story.Tue, 29 Sep 2026 00:00:00 GMThttps://dateandtimetoday.com/blog/the-2038-boundary/https://dateandtimetoday.com/blog/the-2038-boundary/Time does not stop. One particular way of storing it reaches its largest positive number.Tue, 29 Sep 2026 00:00:00 GMThttps://dateandtimetoday.com/blog/atomic-second/https://dateandtimetoday.com/blog/atomic-second/The second is defined through an atom. Getting that definition onto your laptop is a different—and fascinating—problem.Tue, 29 Sep 2026 00:00:00 GMT