calculate differences between two time in minutes

Question

How to calculate differences between two time eg(server time=04:30 pm and <p id="orderTime">02:30 pm</p>) and return it in minutes such as 90 minutes using jquery and javascript. The server time and order time is in 12 hour format not in 24h.

How is the server time returned? A string? A JSON formatted datetime? Is it stored in a variable? Can you show the code that retrieves it? — pete, Jun 25 '13 at 02:27
the time is in HH:mm am/pm format and it should return in minutes 00:60 / 60 minutes — gjman2, Jun 25 '13 at 02:27
Matt Johnson, I want the time in 12 hours format not in 24 hours — gjman2, Jun 25 '13 at 02:29
The server time I simply use the var CurrentDate=new Date(); — gjman2, Jun 25 '13 at 02:30

score 1 · Accepted Answer · edited Jun 25 '13 at 02:57

1

If you can guarantee they always will be of that format, then here is a straightforward solution:

function humanReadableToMinutes(time)
{
    var parts = time.split(/ |:/);

    return (parts[2] == 'pm' * 12 * 60) 
        + parseInt(parts[0], 10) * 60 
        + parseInt(parts[1], 10);
}

http://jsfiddle.net/aYwux/2/

Explanation:

By var parts = time.split(/ |:/); we're splitting 02:30 pm into 3 parts: 02, 30, pm.

return (parts[2] == 'pm' * 12 * 60) + parseInt(parts[0], 10) * 60 + parseInt(parts[1], 10); contains of 3 operands:

* (parts[2] == 'pm' * 12 * 60) --- adds additional 12 hours if it's "pm"
* parseInt(parts[0], 10) * 60 - takes hours fraction extracted and converts it to minutes
* parseInt(parts[1], 10) - minutes fraction

PS: this solution doesn't take care of 12am and 12pm accurately, so it's a homework for the OP

edited Jun 25 '13 at 02:57

Lee Taylor

7,761
16
33
49

answered Jun 25 '13 at 02:32

zerkms

249,484
69
436
539

Can you please explain me about your codes. Because I like to try to understand it – gjman2 Jun 25 '13 at 02:35
1

Btw, I'd like to hear the criticism from the downvoter :-) – zerkms Jun 25 '13 at 02:40
1

@gjman2: is it clear enough now? – zerkms Jun 25 '13 at 02:41
@gjman2: see the PS part :-) – zerkms Jun 25 '13 at 02:45

calculate differences between two time in minutes

1 Answers1