Re^3: Round time to nearest 15 or 30 minutes

[DrHyde]

If you want the nearest 15 minute boundary, then the code is wrong. It will give you the previous 15 minute boundary.

You need to:

• add $interval/2 minutes to the time;
• subtract the remainder you'd get when dividing by $interval minutes.

Note that the modulus operator % only works with integers. In practice, you can probably ignore the fraction of a minute that gets thrown away. If you can't, then you'll need to write your own remainder function.