How can i fix my swatch if it is changing the day at 1:30 am instead of 12 am

I'm not sure if your swatch is simply clicking over at 1:30am, or if it is actually starting to switch over much earlier, and then completing the switch at 1:30.

the latter is how most watches work...especially my beloved seiko SKX diver automatic. the switchover begins prior to midnight, and ends after midnight...sometimes starting the slow turnover as early as 11:30pm in some watches and ending at as late as 1:30.

however, if this is not the case with you, and it's just flipping over late, i don't know what can be done with something like a swatch. you don't mention if it's an automatic or quartz, but literally most swatches are NOT built to be repaired. they were conceived as a throwaway watch when done with, and the cases are not made to be opened for repairs.

they have become such a cult item that if you look ******* google you can find companies or people who have learned how to open a swatch without destroying it, can source parts, and can fix/repair the watch. but it's not an easy slam dunk deal. it's different with each model.

so, with a timepiece like a swatch, with its unique character of having an endlife, kind of like a replicant from Blade Runner, you will need to likely accept what you have bought with its limitations, and the one you've mentioned is minor compared to the watch just breaking and needing to be thrown out or put in a drawer.

the swatch definitely has limits set out by its very concept. and to go back to the movies, as Dirty Harry once said: 'A man's got to know his limitations'.

that goes for watches too.

cheers.