JavaScript Date Compare

I quite often need to compare a date selected on a form to the current date. Usually because I wish to prohibit the form user from selecting a due date in the past. I came up with this JavaScript function to accomplish this check:

/* Function:     DateGEToday Parameters:   dateToCompare, a date string to compare against Returns:      True, if dateToCompare is greater than or equal to today */ function DateGEToday(dateToCompare) {     // By default, set our compare result to false     var result = false;     // Convert the passed date to a date data type     var comp = new Date(dateToCompare);     // Create a data data type for the current date/time     var now = new Date();     // Create a new due date that does not include the time     var dueDate = new Date(comp.getFullYear(), comp.getMonth(), comp.getDate());     // Create a new current date that does not include the time     var today = new Date(now.getFullYear(), now.GetMonth(), now.getDate());     // Compare the two date only variables     if (dueDate >= today) {         result = true;     }     // Return the boolean result     return result; }

Caveat: I am a JavaScript novice, so I welcome constructive comments. I don't doubt this code could be reduced and/or simplified, but it works and it makes sense to me.

The call to this script in a form validation checker might look like this...

var dueDate = document.getElementById('<%= dtcDateTime.Controls[0].ClientID %>'); if (!DateGEToday(dueDate.value)) {     document.getElementById('<%= dtcDateTime.Controls[0].ClientID %>').focus();     alert('Due date must be today or future date!'); }