Used this solution and just subtract only 12 hours instead of 24 hours. works with only 1 hour subtraction too.
If you use a 1 hour subtraction, you'll be back here in half a year when it fails because of a DST change in the other direction.

In reply to Re^3: Yesterdays date while daylight saving time change by JavaFan
in thread Yesterdays date while daylight saving time change by Schaelle

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