Volcano time frame differs from overworld time frame. This has happened to me many times on console(a year or so ago) and once on pc(as of today). I've had it vary from 3 days difference on pc and up to 40+ days difference on console.
Steps to Reproduce
Entered volcano. Stayed on volcano for roughly 7 days. exited volcano on day 72 and time frame changed to day 65 in overworld but stays on day 72 when changing between volcano and overworld.
Entered volcano. Stayed on volcano for roughly 7 days. exited volcano on day 72 and time frame changed to day 65 in overworld but stays on day 72 when changing between volcano and overworld.