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World time information on Asia - Dhaka

Generally the borders run north-south and there are about 24 zones, but there are many exceptions where the borders follow national boundaries and a few half-hour or quarter-hour zones exist.
Time zones often lie west of their idealized boundaries, resulting in year-round DST.
Western China, Iceland, and other areas skew time zones westward, in effect observing DST year-round without complications from clock shifts
For example, Saskatoon, Saskatchewan, is at 106° 39' W longitude, slightly west of center of the idealized Mountain Time Zone (105° W), but the time in Saskatchewan is Central Standard Time (90° W) year-round, so Saskatoon is always about 67 minutes ahead of mean solar time.
Western France, Spain, and other areas skew time zones and shift clocks, in effect observing DST in winter with an extra hour in summer
For example, Nome, Alaska, is at 165° 24' W longitude, which is just west of center of the idealized Samoa Time Zone (165° W), but Nome observes Alaska Time (135° W) with DST, so it is slightly more than two hours ahead of the sun in winter and three in summer.
DST is generally not observed near the equator, where sunrise times do not vary enough to justify it
Some countries observe it only in some regions; for example, southern Brazil observes it while equatorial Brazil does not.
Only a minority of the world's population uses DST because Asia and Africa generally do not observe it.
A standing man in three-piece suit, facing camera
He is about 60 and is bald with a mustache
His left hand is in his pants pocket, and his right hand is in front of his chest, holding his pocket watch.
William Willett independently proposed DST in 1907 and advocated it tirelessly.
Willett's 1907 proposal argued that DST increases opportunities for outdoor leisure activities during afternoon sunlight hours
The longer days nearer the summer solstice in high latitudes offer more room to shift daylight from morning to evening so that early morning daylight is not wasted.
General agreement about the day's layout confers so many advantages that a standard DST schedule usually outranks ad hoc efforts to get up earlier, even for people who personally dislike the DST schedule.
DST's potential to save energy comes primarily from its effects on residential lighting, which consumes about 3.5% of electricity in the U.S. and Canada.
Delaying the nominal time of sunset and sunrise reduces the use of artificial light in the evening and increases it in the morning
As Franklin's 1784 satire pointed out, lighting costs are reduced if the evening reduction outweighs the morning increase, as in high-latitude summer when most people wake up well after sunrise
An early goal of DST was to reduce evening usage of incandescent lighting, formerly a primary use of electricity.