Us time zones code#

In the United States, Daylight Saving Time commences at 2:00 a.m. In spring, clocks spring forward from 12:59 a.m. In spring, clocks spring forward from 1:59 a.m. Daylight Shifting Time would be better, and Daylight Time Shifting more accurate, but neither is politically desirable. Daylight Savings Time is also in common usage, and can be found in dictionaries.Īdding to the confusion is that the phrase Daylight Saving Time is inaccurate, since no daylight is actually saved. Nevertheless, many people feel the word savings (with an 's') flows more mellifluously off the tongue. Saving is used in the same way as saving a ball game, rather than as a savings account. Similar examples would be a mind-expanding book or a man-eating tiger. Because of this, it would be more accurate to refer to DST as daylight-saving time. It modifies time and tells us more about its nature namely, that it is characterized by the activity of saving daylight. Saving is used here as a verbal adjective (a participle). The official spelling is Daylight Saving Time, not Daylight Saving S Time.

See more information about elsewhere in the world.ĭuring DST, clocks are turned forward an hour, effectively moving an hour of daylight from the morning to the evening. In the EU, all time zones change at the same moment. It begins the last Sunday in March and ends the last Sunday in October. In the European Union, Summer Time begins and ends at 1:00 a.m. In the U.S., each time zone switches at a different time. on the second Sunday in March and reverts to standard time on the first Sunday in November. Var june2 = new Date(temp.substring(0, temp.Most of the United States begins Daylight Saving Time at 2:00 a.m. var june1 = new Date(rightNow.getFullYear(), 6, 1, 0, 0, 0, 0) If the offsets are the same, then we know that the location DOES NOT observe DST. If the offsets are different, then we know that the location observes DST. Since DST is always observed during the summer, we can compare the time offset between two dates in January, to the time offset between two dates in June. The second thing that you need to know is whether the location observes daylight savings time (DST) or not. Var jan2 = new Date(temp.substring(0, temp.lastIndexOf(' ')-1)) Var jan1 = new Date(rightNow.getFullYear(), 0, 1, 0, 0, 0, 0) Josh Fraser has a nice write up on it here var rightNow = new Date() If you want, you can also get a feel for the timezone by asking the browser If it's absolutely necessary to pay a subscription to a service in order to do this, then it will not be worth it and we will just have to ask users explicitly.Īlthough language isn't particularly relevant as I can probably convert things however needed, we're using PHP and MySQL.

Us time zones code#

I've found a lot of zip code databases, and so far only a few contain time zone information, but those that do are not free, such as this one. I realize zip codes won't help with figuring out the time zone outside the US, but in that case we'd have to manually ask anyway, and we deal predominantly with the US regardless. They will be able to manually set the time zone later if our best guess is wrong. We are trying to minimize the amount of data we explicitly have to ask them for. What would be the best way to determine a good potential guess of their time zone from this zip code? When users register with our app, we are able to infer their zip code when we validate them against a national database.