utc

This question already has an answer here: Does Python's time.time() return the local or UTC timestamp? 7 answers I need to generate a UNIX timestamp in UTC time so I'm using time.time() to produce it. Do I need to do anything else or is the timestamp automatically in UTC? Technically, time.time() doesn't specify, and practically, at least in CPython, it returns a timestamp in whatever format is used by the underlying standard C library's time function. The C standard (which isn't freely available) doesn't say whether this is GMT, and neither does the POSIX standard . It just says: The time()

GMT、UTC、CTS： UTC时间：世界协调时间（UTC）是世界上不同国家用来调节时钟和时间的主要时间标准，也就是零时区的时间。UTC是以原子时秒长为基础，在时刻上尽量接近于GMT的一种时间计量系统。为确保UTC与GMT相差不会超过0.9秒，在有需要的情况下会在UTC内加上正或负闰秒。UTC现在作为世界标准时间使用。 GMT：即格林尼治标准时间，也就是世界时。GMT的正午是指当太阳横穿格林尼治子午线（本初子午线）时的时间。但由于地球自转不均匀不规则，导致GMT不精确，现在已经不再作为世界标准时间使用。所以，UTC与GMT基本上等同，误差不超过0.9秒。 CST时间：中央标准时间 Central Standard Time (USA) UT-6:00（美国cst时间：零区时减6个小时） Central Standard Time (Australia) UT+9:30（澳大利亚cst：加9个半小时） China Standard Time UT+8:00（中国cst:加8个小时） Cuba Standard Time UT-4:00 （古巴cst:减4个小时） 如：当UTC时间为0点时，中国CST时间为8点，因为零时区和中国北京时区相差8个时区。 时区： 地球自西向东旋转，东边比西边先看到太阳，东边的时间也比西边的早。为了统一世界的时间

Is there a method in C# that returns the UTC (GMT) time zone? Not based on the system's time. Basically I want to get the correct UTC time even if my system time is not right. Instead of calling DateTime.Now.ToUniversalTime() you can call DateTime.UtcNow Same thing but shorter :) Documentation here . Not based on the system's time? You'd need to make a call to a network time service or something similar. You could write an NTP client, or just screenscrape World Clock ;) I don't believe .NET has an NTP client built in, but there are quite a few available . Nicki I use this from UNITY //Get a

What's the easiest way to get the UTC offset in PHP, relative to the current (system) timezone? date('Z'); returns the UTC offset in seconds. Tuhin Bepari // will output something like +02:00 or -04:00 echo date('P'); timezone_offset_get() $this_tz_str = date_default_timezone_get(); $this_tz = new DateTimeZone($this_tz_str); $now = new DateTime("now", $this_tz); $offset = $this_tz->getOffset($now); Untested, but should work I did a slightly modified version of what Oscar did. date_default_timezone_set('America/New_York'); $utc_offset = date('Z') / 3600; This gave me the offset from my timezone

How would I convert a preexisting datetime to UTC time without changing the actual time. Example: DateTime dateTime = GetSomeDateTime(); // dateTime here is 3pm dateTime.ToUtcDateTime() // datetime should still be 3pm 6/1/2011 4:08:40 PM Local 6/1/2011 4:08:40 PM Utc from DateTime dt = DateTime.Now; Console.WriteLine("{0} {1}", dt, dt.Kind); DateTime ut = DateTime.SpecifyKind(dt, DateTimeKind.Utc); Console.WriteLine("{0} {1}", ut, ut.Kind); Use the DateTime.SpecifyKind static method. Creates a new DateTime object that has the same number of ticks as the specified DateTime, but is designated as

I have recently updated my system to record date/times as UTC as previously they were storing as local time. I now need to convert all the local stored date/times to UTC. I was wondering if there is any built in function, similar to .NET's ConvertTime method? I am trying to avoid having to write a utility app to do this for me. Any suggestions? If they're all local to you, then here's the offset: SELECT GETDATE() AS CurrentTime, GETUTCDATE() AS UTCTime and you should be able to update all the data using: UPDATE SomeTable SET DateTimeStamp = DATEADD(hh, DATEDIFF(hh, GETDATE(), GETUTCDATE()),

I'm using Dapper to map my entities to SQL Server CE. If I save a DateTime with Kind=Utc , when I read it back I get a DateTime with Kind=Unspecified , which leads to all kind of problems. Example: var f = new Foo { Id = 42, ModificationDate = DateTime.UtcNow }; Console.WriteLine("{0} ({1})", f.ModificationDate, f.ModificationDate.Kind); connection.Execute("insert into Foo(Id, ModificationDate) values(@Id, @ModificationDate)", f); var f2 = connection.Query<Foo>("select * from Foo where Id = @Id", f).Single(); Console.WriteLine("{0} ({1})", f2.ModificationDate, f2.ModificationDate.Kind); This

How do I query a mysql db to return all records with a datetime older than 1 week ago. Note that the datetime table stores everything in UTC, and i should be comparing it in that itself... Jusst to be clear - I'm looking for a pure mysql query SELECT * FROM tbl WHERE datetime < NOW() - INTERVAL 1 WEEK If your table stores datetimes in different timezone than what NOW() returns, you can use UTC_TIMESTAMP() instead to get the timestamp in UTC. SELECT * FROM table WHERE DATEDIFF(NOW(),colname) > 7; Michael Pakhantsov SELECT SUBDATE('2008-01-02', 7); OR SELECT SUBDATE(now(), INTERVAL 1 week);