Summer time, or daylight savings time (DST), begins on different dates around the world. Much of the northern hemisphere enters summer in either March or April, whereas the southern hemisphere enters summers in October or November.
The change usually happens late at night, but the exact time varies - anything between 10pm and 3am is common.
In 2009, DST in the northern hemisphere begins on these dates:
- February 15th at midnight (first location to enter DST)
- United States and Canada
- March 8th
- Argentina and Chile
- March 15th
- United Kingdom and much of Europe
- March 29th
- June 1st (last location to enter DST)