Convert string to time and add some minutes

Question

I have a form and one button to plus some minutes to a time(hh:MM), but the time is a span tag.

At Firefox works well, but when I tested at Chrome doesn't work the Date(). What happened?

//Botão adicionar horário agenda.
$('.button').click(function() {
  var $duration_schedule = $('#duration');
  var duration = $duration_schedule.val(); // 30
  var hour = $('.time_schedule_form').text(); // 10:00
  var new_time = self.Plus_minutes(hour, duration);
  alert(new_time); // 10:30
});


Plus_minutes: function(hour, duration) {
    var time, new_hour, hours = '';
    time     = new Date("T"+hour); // Erro at Chrome
    time.setTime(time.getTime() + duration*60000);
    hours     = time.getHours().toString();
    minutes   = time.getMinutes().toString();
    if (minutes.length > 1) {
        new_hour = hours + ':' + minutes;
    } else {
        new_hour = hours + ':0' + minutes;
    }

    return new_hour;
},

score 1 · Accepted Answer · edited May 23 '17 at 12:18

I suppose that it is happening because of constructor's input! In case of time you should put numbers in milliseconds. The Data Object have those constructors bellow:

new Date();
new Date(value);
new Date(dateString);
new Date(year, month[, date[, hours[, minutes[, seconds[,milliseconds]]]]]);

you can take at look at Developer.mozilla then you can check a better explanation about formats.

Maybe the Firefox are converting to including something in that part of code. I found out other explanation about Data input formats, you can take a look too at: Convert String to Date

score 0 · Answer 2 · answered May 03 '17 at 12:14

0

The correct format for UTC would be like 2013-02-27T17:00:00Z (Z is for Zulu Time). Append Z if not present to get correct UTC datetime string.

answered May 03 '17 at 12:14

Waqas Ahmed

185
2
11

score 0 · Answer 3 · answered May 03 '17 at 12:19

0

You could achieve this using setMinutes to update using getMinutes.

newdate.setMinutes(newdate.getMinutes() + 10);

answered May 03 '17 at 12:19

Davor Mlinaric

1,989
1
19
26

My real problem occours when I convert the string to Date. time = new Date("T"+hour); that doesn't work at Chrome. – Matheus Hahn May 03 '17 at 12:20

Convert string to time and add some minutes

3 Answers3