I don't know where the Base Time is coming from, but it is not is ISO 8601 format.
2023-10-02-06:30 - Your Current Value
2023-10-02T06:30 - ISO 8601 Format
The dash '-' in your current format is not correct, it should have a 'T' to represent time.
You will need to change that source time so that it has a 'T' in place of the dash '-' before it can be converted by timezone.
After re-reading, I see that the one in the first is actually working in the yyyy-MM-dd-hh:mm format.
Hmmmmm let me look closer