js calculation time difference code [including calculation, day, hour, minute, second]

var begintime_ms = Date.parse(new Date(begintime.replace(/-/g, "/"))); //begintime is the start time

var endtime_ms = Date.parse(new Date(endtime.replace(/-/g, "/"))); // endtime is the end time

The result is milliseconds, and the time can be judged based on the size of milliseconds.

Of course, according to the number of milliseconds, you can find the difference of days or hours, etc. according to their difference.

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The above is the number of milliseconds to obtain the user input time

var date1=new Date(); //Start time

var date2=new Date(); //End time

var date3=date2.getTime()-date1.getTime() //The number of milliseconds of the time difference

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//Calculate the number of days of difference

var days=Math.floor(date3/(24*3600*1000))

//Calculate the number of hours

var leave1=date3%(24*3600*1000) //The number of milliseconds remaining after counting the number of days

var hours=Math.floor(leave1/(3600*1000))

//Calculate the number of minutes of phase difference

var leave2=leave1%(3600*1000) //The number of milliseconds remaining after calculating the number of hours

var minutes=Math.floor(leave2/(60*1000))

//Calculate the phase difference seconds

var leave3=leave2%(60*1000) //The number of milliseconds remaining after counting the number of minutes

var seconds=Math.round(leave3/1000)

alert(" difference"+days+"days"+hours+"hours+" minutes+" minutes"+seconds+" seconds")

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