Javascript 如何用moment.js减去2次，然后减去一些分钟
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How to subtract 2 times with moment.js, then subtract some minutes
提问by HerrimanCoder
I need to subtract 2 times with moment.js (get the difference), and then with that result, subtract some additional minutes (simple int). It's for calculating timesheets. A few examples:
我需要用 moment.js 减去 2 次（得到差值），然后用这个结果减去一些额外的分钟（简单整数）。它用于计算时间表。几个例子：
Example #1:
Start time: 10:00 AM (represented in js as "10:00")
End time: 2:00 PM (represented in js as "14:00")
Lunch: 30 minutes ("30")
Expected result: "3:30" (10am - 2pm is 4 hours, minus 30 minutes for lunch = 3hrs 30 mins -- and I need it output as "3:30")
Example #2:
Start time: 6:15 AM (represented in js as "6:15")
End time: 4:45 PM (represented in js as "16:45")
Lunch: 0 minutes ("0")
Expected result: "10:30"
I know moment.js can do this but I'm struggling to get expected results. I've been trying this:
我知道 moment.js 可以做到这一点，但我正在努力获得预期的结果。我一直在尝试这个：
function getTimeInterval(startTime, endTime){
return moment(moment(startTime,"hh:mm").diff(moment(endTime,"hh:mm"))).format("hh:mm");
}
The formatting seems right, but I'm getting incorrect values. For example, the result returned for my example #2 is "6:30" instead of "10:30" And then how do I subtract off int minutes for lunch?
格式似乎正确，但我得到的值不正确。例如，我的示例#2 返回的结果是“6:30”而不是“10:30”然后我如何减去午餐的 int 分钟？
Any help is much appreciated.
任何帮助深表感谢。
回答by Matt Johnson-Pint
// parse time using 24-hour clock and use UTC to prevent DST issues
var start = moment.utc(startTime, "HH:mm");
var end = moment.utc(endTime, "HH:mm");
// account for crossing over to midnight the next day
if (end.isBefore(start)) end.add(1, 'day');
// calculate the duration
var d = moment.duration(end.diff(start));
// subtract the lunch break
d.subtract(30, 'minutes');
// format a string result
var s = moment.utc(+d).format('H:mm');
Pay close attention to the casing of the formats. You were using hhwhich is for a 12-hour clock.
密切注意格式的外壳。您使用的hh是 12 小时制。
See also: Get the time difference between two datetimes
另请参阅： 获取两个日期时间之间的时差
回答by VincenzoC
You can use the diffmethod to calculate the difference between two dates and the subtractmethod to subtract time. In your case:
您可以使用该diff方法来计算两个日期之间的差异和subtract减去时间的方法。在你的情况下：
function getTimeInterval(startTime, endTime, lunchTime){
var start = moment(startTime, "HH:mm");
var end = moment(endTime, "HH:mm");
var minutes = end.diff(start, 'minutes');
var interval = moment().hour(0).minute(minutes);
interval.subtract(lunchTime, 'minutes');
return interval.format("HH:mm");
}
