Clocks back and clocks forward change time fall and spring it really should be called Summer Daylight Hour Extention (SDHE) for clarity as Daylight Savings Time makes the clocks go forward in the spring thus giving more daylight in evenings whereas if this was not done in summer the mornings would get light way too early
UNITED STATES and Canada for 2020
Begins on Sunday 8 March at 2am
Set your clocks AHEAD one hour before bed time Saturday night on March 7th
Ends on Sunday 1 November at 2am
Set your clocks BACK one hour before bed time on Saturday night October 31st which will be once in a blue moon where the blue moon is full on Halloween a very very rare event!
Includes most of most of Canada and some nearby islands and countries south such as Cuba, The Bahamas, Bermuda, and parts of Mexico (Baja California, Chihuahua, Tamaulipas, Nuevo Leon), Haiti, Greenland (Thule Air Base)
Areas within those regions that do not observe daylight savings: Arizona and the Navajo Nation in Arizona, and Hawaii; some areas in Canada, most of Saskatchewan, some regions of British Columbia, small region of Nunavut, small region of Quebec, small region of Ontario.
United Kingdom / Europe for 2020
Begins on Sunday 31 March early morning at 1am GMT
Set your clocks AHEAD one hour before that time on Saturday the 30th
Ends on Sunday 27 October early morning at 1am GMT
Set your clocks BACK one hour before that time on Saturday the 26th
this applies to almost all of the United Kingdom
Mexico (most areas) for 2020
Begins on Sunday March 8 2020 early morning at 2am
Set your clocks AHEAD one hour before that time on Saturday the 4th
Ends on Sunday 1 November 2020 early morning at 2am
Set your clocks BACK one hour before that time on Saturday October 31th which is once in a blue moon as it's also Halloween that night when the 2nd full moon of October will be howling!
Adjust the clock and date on your Windows 10 system
Settings > date and time