# DST-safe recurring classes
> Harmony keeps a "4:00 PM Monday" class at 4:00 PM through daylight-saving changes by storing the weekly pattern in the studio timezone.

## Short answer
Recurring classes are anchored to the studio timezone and expanded with timezone-aware math so wall-clock times stay correct across DST.

## FAQ
### Do Harmony class times shift when daylight saving starts or ends?

No. Recurring classes are stored in the studio's timezone and expanded with timezone-aware math, so a "4:00 PM Monday" class stays at 4:00 PM local wall-clock time through DST changes.

### Whose timezone does Harmony use?

The studio timezone is the scheduling anchor for every series. Members may view times in their own zone in the app, but the stored pattern stays on the studio clock.

### What happens to a class that falls on a DST transition day?

Harmony expands the weekly pattern with the studio zone's rules for that calendar date, so the occurrence keeps the intended local start time instead of drifting by an hour.

HTML: https://harmonyscheduling.com/guides/dst-recurring-classes