Daylight saving is introduced to save the daylight in the non-tropical regions of the world.
It is done by turning the clock one-hour ahead when summer approaches so that darkness falls later each day according to the clock.
The clocks are again set one-hour back to standard time when winter approaches so that the morning lights can be saved. Winter brings very early nights in cold countries.
Only a minority of the World's population uses DST. Most areas in Europe and North America and some part of South America and Australia observe daylight saving.
Asia and Africa do not observe as they fall near the equator where sunrise times do not vary.
The dates of DST may be different according to regions. For ex. In most of North America, clocks are set forward one hour on the second Sunday in March and back on the first Sunday in November. This varies in other countries.
The clock shifts complicate and confuse things most of the time like it can disrupt travel, record keeping, scheduling and synchronization problems in the operating systems in DST countries and any system in different country that interact with them.
To address this issue, Microsoft and other software makers issued Daylight Saving Time Patch. It is a modular piece of code created to update systems, devices, and programs for compatibility with the new start and end dates for Daylight Saving Time in the United States, Canada, and Bermuda.
Computer software often adjust clocks automatically but devices like wall clock, clocks in automobiles, etc., needs manual help.