javascript 使用javascript从日期时间中提取时间

extract time from datetime using javascript

提问by Psl

how can i extract time from datetime format.

如何从日期时间格式中提取时间。

my datetime format is given below.

我的日期时间格式如下。

var datetime =2000-01-01 01:00:00 UTC;

I only want to get the time 01.00as 01

我只想要得到的时间01.00为01

回答by Andrew

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleTimeString

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleTimeString

Date.prototype.toLocaleTimeString() Returns a string with a locality sensitive representation of the time portion of this date based on system settings.

Date.prototype.toLocaleTimeString() 根据系统设置返回一个字符串，该字符串具有该日期时间部分的位置敏感表示。

var time = datetime.toLocaleTimeString();

Update:

更新：

The new locales and options arguments let applications specify the language whose formatting conventions should be used and customize the behavior of the function. In older implementations, which ignore the locales and options arguments, the locale used and the form of the string returned are entirely implementation dependent.

新的语言环境和选项参数让应用程序指定应使用其格式约定的语言并自定义函数的行为。在忽略语言环境和选项参数的旧实现中，使用的语言环境和返回的字符串形式完全取决于实现。

// Depending on timezone, your results will vary
var event = new Date('August 19, 1975 23:15:30 GMT+00:00');

console.log(event.toLocaleTimeString('en-US'));
// expected output: 1:15:30 AM

console.log(event.toLocaleTimeString('it-IT'));
// expected output: 01:15:30

回答by subodh

What about these methods

这些方法呢

new Date().getHours()

新日期().getHours()

new Date().getMinutes()

新日期().getMinutes()

For example:

例如：

 var d = new Date();
 var n = d.getHours();

Edited

已编辑

Return the hour, according to universal time:

根据世界时间返回小时：

new Date().getUTCHours()

新日期().getUTCHours()

Example:

例子：

var d = new Date();
var n = d.getUTCHours(); 

回答by Mark Walters

As an alternative if you want to get the time from a string -

作为替代，如果您想从字符串中获取时间 -

var datetime ="2000-01-01 01:00:00 UTC";
var myTime = datetime.substr(11, 2);
alert(myTime) //01

回答by George Moik

with the moment.js library it works in this way:

使用moment.j库，它以这种方式工作：

var result = moment().format('hh');
alert(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.1/moment.min.js"></script>

回答by Anujith

var datetime = ("2000-01-01 01:00:00 UTC");
var d1 = new Date(datetime);
var minute = d1.getUTCMinutes();
var hour = d1.getUTCHours();
if(minute > 0)  
     alert(hour+"."+minute);
else
     alert(hour);

Demo

演示

回答by chungtinhlakho

var date1 = new Date(1945,10,20, 17,30)
var date2 = new Date(1970,1,8, 12,00)

console.log(date1.getHours() - 8 + (date1.getMinutes()/60))

console.log(date2.getHours() - 8 + (date2.getMinutes()/60))

回答by Bergi

Assuming you have a Dateobjectlike

假设你有一个Date对象像

var datetime = new Date("2000-01-01 01:00:00 UTC"); // might not parse correctly in every engine
// or
var datetime = new Date(Date.UTC(2000, 0, 1, 1, 0, 0));

then use the getUTCHoursmethod:

然后使用getUTCHours方法：

datetime.getUTCHours(); // 1

回答by Code L?ver

Use the following code:

使用以下代码：

var datetime = "2000-01-01 01:00:00 UTC";

var dt = new Date(datetime);
var hr = dt.getUTCHours();
if(hr > 12) {
   hr -= 12;
}
alert(hr);

refer this link also.

也参考这个链接。