Monday lasts 48 hours. A Summary of the International Standard Date and Time Notation - a good overview of the ISO 8601 notation for dates. All Time Zone Calculator - Find the time in cities around the globe. Pre plan your sleep requirements. Time - Displayed in a variety of useful formats.
Site is a front-end to U.S. government atomic clocks.
Daylight Saving Time - History of Daylight Saving Time and how we use it to save energy. Daylight Saving Time begins for most of the United States at 2 a.m. on the first Sunday of April. Time reverts to standard time at 2 a.m. on the last Sunday of October. Global Metric Time Service - Displays the current time in user selected time zones. This site is an organized collection of links to about 3000 links to horological websites globally.