If you don't want to miss television shows, Don't want to miss appointments and don't want to go in mental block of one hour less sleep, then depending on where you live, you will need to move the clock forward or backward by one hour. In US, 2009 Daylight Saving Time begins on Sunday, March 8 at 2 AM and ends on Sunday, November 1 at 2 AM as well. Time moves ahead one hour in March while it moves back one hour in November (hence the saying "Spring forward, Fall back").

US Daylight Saving Time begins on the second Sunday of March and ends on the first Sunday of November. In many western European countries Daylight Saving Time begins on the last Sunday of March and concludes in October on the last Sunday of that month. check out daylight savings time, summer time 2009, day light savings time 2009, daylight savings time schedule

Year DST Begins 2 a.m.
(Second Sunday in March)
DST Ends 2 a.m.
(First Sunday in November)
2007 March 11 November 4
2008 March 9 November 2
2009 March 8 November 1
2010 March 14 November 7
2011 March 13 November 6
2012 March 11 November 4
2013 March 10 November 3
2014 March 9 November 2
2015 March 8 November 1

Table :- Daylight Saving Time Schedule USA for 2007 - 2015

Daylight saving time (DST; also, summer time in British English; is the convention of advancing clocks so that afternoons have more daylight and mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn. Here is Daylight saving time around the world.
MAP Countries / Territories Observing DayLight
Savings Time [DST] http://www.worldtimezone.com/daylight.html
Plus Countries / Territories That Do Not Use DST
While UTC Remains a 'Constant' World Wide Standard Time 24/7 "Everywhere"
This is one of the good link to show current Day light