how to add hours and minute

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my code is

C#

Date.prototype.addMinutes = function (m) {
           this.setHours(this.getHours() + m);
           return this;
       };

Posted 17-Feb-15 2:15am

sanjaysgh

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ZurdoDev 17-Feb-15 8:47am

Wouldn't you divide m by 60?

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enhzflep · Answer 1 · 2015-02-17T03:26:00

Hints:
1. The javascript date object has a method .getTime() that allows you to get an integer that represents the number of milliseconds since an arbitrary date*.

2. You can use a number in the same format passed as a parameter when creating/setting a date object.

Note: The arbitrary date is actually "Thu Jan 01 1970 11:00:00 GMT+1100 (AUS Eastern Daylight Time)" over here. - if you use the value of 0 in a call to .setTime you can see this reflected in the resultant date).

With that in mind, consider the following snippet:

JavaScript

var now = new Date();
var hourLater dayLater = new Date();

hourLater dayLater.setTime( now.getTime() + (24 * 60 * 60 * 1000) );

We simply create two date objects and initialize them with the current time.
Next, we get the current time as the number of ms since 1/1/1970 and finally add the number of milliseconds in 24 hours, before using this value to set the second date object.

Finally, punching now and ~~hourLater~~ dayLater into the console gives the following:

> now
< Wed Feb 18 2015 01:09:36 GMT+1100 (AUS Eastern Daylight Time)
> ~~hourLater~~ dayLater
< Thu Feb 19 2015 01:09:36 GMT+1100 (AUS Eastern Daylight Time)

Lastly: Chrome will autosuggest the available members of an object when typing in the console. I.e, if you open it up (Ctrl-Shift-I) and type "var test = new Date();" you'll get a response that says "undefined". If you then type "test.", Chrome will show a drop-down list of available members of the Date object.