Understanding DateInterval

General
1

A very stupid question today: How do I use DateInterval? I want to do a countdown. If I use

dim d as new DateInterval(0, 0, 0, 1, 0, 0, 0) d.Minutes = d.Minutes - 1

I get a DateInterval of

hours = 1 minutes = -1

instead of 59 minutes. Is the DateInterval meant to be used this way?

2

i believe you can add/sub a interval to a datetime.

3

You can use any value, 1 hour and - 1 minutes, 59 minute, 60 minutes and -60 seconds…
dateTime will be used with the right order and as the value is the same the result will be the same

4

I don’t have a DateTime, just the DateInterval because I want to do a countdown. Something like xx hours and yy minutes.

So I make a DateTime of my max countdown value and do the difference with a DateInterval of -1 minute?

5

If you want to show how much time you have to a final date you can:
dim d as dateInterval = finalDate - datetime.now
where final date is your target datetime

now using the dateInterval props you can show to the user xx hours and yy minutes

6

Thanks, Antonio, that makes sense. Still thinking that DateInterval should be immutable.