Question

I have a .net 2.0 ascx control with a start time and end time textboxes. The data is as follows:

txtStart.Text = 09/19/2008 07:00:00

txtEnd.Text = 09/19/2008 05:00:00

I would like to calculate the total time (hours and minutes) in JavaScript then display it in a textbox on the page.

Answer 1

Once your textbox date formats are known in advance, you can use Matt Kruse’s Date functions in Javascript to convert the two to a timestamp, subtract and then write to the resulting text box.

Equally the JQuery Date Input code for stringToDate could be adapted for your purposes – the below takes a string in the format ‘YYYY-MM-DD’ and converts it to a date object. The timestamp (getTime()) of these objects could be used for your calculations.

stringToDate: function(string) {     var matches;     if (matches = string.match(/^(\d{4,4})-(\d{2,2})-(\d{2,2})$/)) {        return new Date(matches[1], matches[2] - 1, matches[3]);     } else {        return null;     }; }