dgd-contributor opened a new pull request #32666:
URL: https://github.com/apache/spark/pull/32666
### What changes were proposed in this pull request?
Before this patch, fromUTCtime and toUTCtime produced wrong result on
Daylight Saving Time changes days
For example, in LA in 1960, timezone switch from UTC-7h to UTC-8h at 2AM
in 1960-09-25 but previous version have the cutoff at 8AM
### Why are the changes needed?
correctness
### Does this PR introduce _any_ user-facing change?
yes, as correct the result produced by those two functions
### How was this patch tested?
Add test
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