Question

It seems I can’t compare 2 date values with time.

When I compare just date part – year, month and day – everything works fine. But when I add comparing times everything breaks down and not even month fits.

So what’s some basic algorithm for comparing 2 dates? I mean generally, I can’t juse use dateTime1.CompareTo(dateTime2). Preferably in pseudocoude. Thanks.

Edit: Now I found out that it only compares with last comparision. So if last is day comparing it is compared by days and doesn’t take into account year or month.

I just need basic algorithm for comparing 2 dates. I believe it must be simple…

Answer 1

The following format should work pretty well:

DateTime a
DateTime b
if a.year != b.year
    return a.year < b.year
else if a.month != b.month
    return a.month < b.month
else if a.day != b.day
    return a.day < b.day
else if a.hour != b.hour
    return a.hour < b.hour
else if a.minute != b.minute
    return a.minute < b.minute
else
    // Dates are same