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6.4.3.1. ...daylight savings time?

In many parts of the world, daylight savings time , or summer time , shifts the local time by one hour through the spring and summer months. In most jurisdictions in North America, the local time jumps from 2:00 a.m. to 3:00 a.m. during the spring time change and from 3:00 a.m. to 2:00 a.m. during the autumn time change. The spring time change has been held on the first Sunday in April, but that will change (experimentally) to the second Sunday in March in 2007. The fall time change has been held on the last Sunday in October, which will change to the first Sunday in November in 2007. If the changes do not result in significant energy savings, governments may revert to the traditional dates.

This means that there is no 2:30 a.m. local time on the day of the spring time change, and that 1:30 a.m. local time happens twice on the day of the fall time change.

crond was written to take this issue into account. Jobs scheduled to run between 2:00 and 3:00 a.m. during the spring time change will execute as soon as the time change occurs, and jobs scheduled to run between 1:00 and 2:00 a.m. during the autumn time change will be executed only once.


6.4.2. How Does It Work? | Fedora Linux | 6.4.3.2. ...using an editor other than vi to edit the crontab?