I have my code running as a K8 pod. The pod can get bounced etc. I have a requirement that say I have a scheduler that wakes up every 15 minutes and runs business logic which is diff for

1. 15 minute boundary
2. 30 minute boundary
3. 60 minute boundary
4. Midnight. The midnight is say always UTC midnight.

If pod scheduler starts operating at say 13:03, the next boundary will fall at 13:08, and so on and so forth. How do I round this thing in the easiest way without worrying about too many if-else checks?