How to add 30 minutes to time as hours and minutes

问题

I Have a time variable which is f.ex 5:21 . I want to add 30 minutes to it, then whatever result is, I want to add 30 minutes to it. How can I do this in javascript?
Ie. I want the interval of 30 min to the time I have.

var time = valgraph.datetime; // it's a dynamic time
var times = time.replace('Z', '');
var res = times.substr(11, 5); // time AS 5:20

回答1:

Try this way to add minutes to your time string.

function addMinutesToTime(time, minsAdd) {
  function z(n){ 
     return (n<10? '0':'') + n;
    };
  var bits = time.split(':');
  var mins = bits[0]*60 + +bits[1] + +minsAdd;
  return z(mins%(24*60)/60 | 0) + ':' + z(mins%60);  
} 

result=addMinutesToTime('5:31',30);
alert(result);

SEE FIDDLE

回答2:

try this...

 // dateTime is the variable having your own date
     var d = new Date(dateTime);
     d.setMinutes(d.getMinutes() + 30);

来源：https://stackoverflow.com/questions/28912116/how-to-add-30-minutes-to-time-as-hours-and-minutes