How to determine DST time changes

Date : February 1, 2008

Here’s how to determine the dates when the Daylight Savings Time changes for a given year (I keep forgetting how to do this.):

zdump -v /etc/localtime|grep 2008 /etc/localtime Sun Mar 9 06:59:59 2008 UTC = Sun Mar 9 01:59:59 2008 EST isdst=0 gmtoff=-18000 /etc/localtime Sun Mar 9 07:00:00 2008 UTC = Sun Mar 9 03:00:00 2008 EDT isdst=1 gmtoff=-14400 /etc/localtime Sun Nov 2 05:59:59 2008 UTC = Sun Nov 2 01:59:59 2008 EDT isdst=1 gmtoff=-14400 /etc/localtime Sun Nov 2 06:00:00 2008 UTC = Sun Nov 2 01:00:00 2008 EST isdst=0 gmtoff=-18000

 

Obviously, change 2008 to whatever year you want.