utc | 易学教程

Getting current date in milliseconds (UTC) (NO use of strings)

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问题 Well, you might think that this question has already been asked, but I think it has not. The solutions I've read about all had this "jigsaw puzzle" technique (like getUTCMonth() + getUTCMinutes + ... ). But as I only want to compare the elapsed seconds between two UTC (!) dates, this does not apply. As everybody knows, you can get the current (non-UTC) date by: var d = new Date(); var t_millis = d.getTime(); But this is NOT what I want. I'd like to have the current system date in UTC and in

How is timezone handled in the lifecycle of an ADO.NET + SQL Server DateTime column?

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Using SQL Server 2008. This is a really junior question and I could really use some elaborate information, but the information on Google seems to dance around the topic quite a bit and it would be nice if there was some detailed elaboration on how this works... Let's say I have a datetime column and in ADO.NET I set it to DateTime.UtcNow. 1) Does SQL Server store DateTime.UtcNow accordingly, or does it offset it again based on the timezone of where the server is installed, and then return it offset-reversed when queried? I think I know that the answer is "of course it stores it without

Latest possible FILETIME

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问题 I'm creating a mock object to test my application so that it works at the boundary conditions of time. I'm using FILETIME in the Windows SDK. The link shows the earliest time which is January 1, 1601 (I'm assuming midnight 00:00:00 and both dwLowDateTime and dwHighDateTime are 0x00000000 ), so I have that. What is the latest possible FILETIME? My first instinct is to set dwLowDateTime and dwHighDateTime to 0xFFFFFFFF , but then I questioned if that really is a valid time that I need to test,

Remove time from GMT time format

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问题 I am getting a date that comes in GMT format, Fri, 18 Oct 2013 11:38:23 GMT. The problem is that the time is messing up the timeline that I am using. How can I strip out everything except for the actual date? 回答1: Like this: var dateString = 'Mon Jan 12 00:00:00 GMT 2015'; dateString = new Date(dateString).toUTCString(); dateString = dateString.split(' ').slice(0, 4).join(' '); console.log(dateString); 回答2: If you want to keep using Date and not String you could do this: var d=new Date(); /

解决ubuntu和windows双系统下,ubuntu时间与WINDOWS不同步的问题

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在安装完Windows和Ubuntu双系统之后，经常会遇到时间不同步的问题。如果在ubuntu中更改了系统时间，Windows下的系统时间就不正确了，这个问题如何解决呢？原因：Ubuntu（我不太清楚其它linux发行版是否一样）默认BIOS中存储的时间格式为UTC时间，即是协调世界时，而中国大陆采用ISO 8601-1988的《数据元和交换格式信息交换日期和时间表示法》（GB/T 7408-1994）称之为国际协调时间。因此中国大陆、中国香港、中国澳门、中国台湾、蒙古国、新加坡、马来西亚、菲律宾、西澳大利亚州的时间与UTC的时差均为+8，也就是UTC+8。当采取两种不同策略读时，即Windows认为BIOS中的时间为本地时间，而UBUNTU认为BIOS中存的是0区时间，UBUNTU中得到本地时间之前先要经过转换变成本地时间。解决办法：二者区别也就在于上述原因，解决办法自然是一目了然。Windows和Ubuntu中选择性地修改一个即可。下面是修改Ubuntu的办法： sudo gedit /etc/default/rcS 将其中UTC＝yes改成UTC=no 来源： oschina 链接： https://my.oschina.net/u/811979/blog/665518

UTC vs. GMT - Java vs. .Net

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In .Net UTC and GMT are not the same Difference between UTC and GMT Standard Time in .NET Is it the same with Java? Does Java has the notion that GMT has DST changes while UTC doesnt? Thanks! Daylight Saving Time and GMT is different. GMT is GMT, wherever and whenever. GMT+0 is standard British Time GMT+1 is BST (British Summer Time) As the documentation explains , GMT is equivalent to UT and the difference between UT and UTC is "is an invisibly fine hair to split". As Codemwnci explained, GMT will never have DST applied to it. GMT and UTC will never have "Daylight Savings" or "Summer Time"

centos 将显示时间由UTC更改为CST的方法

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只需要在/etc/profile末尾添加一行 export TZ='CST-8' 然后执行 source /etc/profile 使文件生效即可成功更改 export TZ='CST-8' 然后执行 source /etc/profile 使文件生效即可成功更改来源： https://www.cnblogs.com/aldshengdeng/p/11912476.html

What is the best way to store dates of birth in MongoDB?

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I've read a lot about how to store simple dates (without time) in MongoDB, but I still can't find an answer. Some say to store theme like MongoDate (date + utc time), some say to store theme like a YYYYMMDD string, and some like other funny ways. The rightest way seems to be MongoDate, but why should I store a date of birth as a date with UTC time? Plus, the date of birth "1990-05-21" is stored as "1990-05-20T23:00:00Z" (the day before): this date shouldn't change depending on timezone, but remain the same world wide. I'm still wondering why MongoDB doesn't provide a simple "date" type, as all

uint64 UTC time

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问题 I have a UTC date time without the formatting stored in a uint64, ie: 20090520145024798 I need to get the hours, minutes, seconds and milliseconds out of this time. I can do this very easily by converting it to a string and using substring. However, this code needs to be very fast so I would like to avoid string manipulations. Is there faster way, perhaps using bit manipulation to do this? Oh by the way this needs to be done in C++ on Linux. 回答1: uint64 u = 20090520145024798; unsigned long w

ASP.NET: Get milliseconds since 1/1/1970

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I have an ASP.NET, VB.NET Date, and I'm trying to get the number of milliseconds since January 1st, 1970. I tried looking for a method in MSDN, but I couldn't find anything. Does anyone know how to do this? Sanjeevakumar Hiremath You can subtract any two DateTime instances and get TimeSpan and TotalMilliseconds would give you total milliseconds. Sample below. DateTime dt1970 = new DateTime(1970, 1, 1); DateTime current = DateTime.Now;//DateTime.UtcNow for unix timestamp TimeSpan span = current - dt1970; Console.WriteLine(span.TotalMilliseconds.ToString()); one liner //DateTime.MinValue is 01