diff -up suite3270-4.5/Common/mkversion.py.orig suite3270-4.5/Common/mkversion.py
--- suite3270-4.5/Common/mkversion.py.orig	2026-02-23 17:23:54.155112220 +0100
+++ suite3270-4.5/Common/mkversion.py	2026-02-23 17:24:19.943983520 +0100
@@ -111,7 +111,7 @@ def mkversion(outfile_name: str, program
 
     # Get the date.
     if 'SOURCE_DATE_EPOCH' in os.environ:
-        now = datetime.fromtimestamp(int(os.environ['SOURCE_DATE_EPOCH'])).replace(tzinfo=timezone.utc)
+        now = datetime.utcfromtimestamp(int(os.environ['SOURCE_DATE_EPOCH']))
     else:
         now = datetime.now(timezone.utc)
     builddate = datetime.strftime(now, '%a %b %d %H:%M:%S %Z %Y')