slightly more robust time validity check

common/time_helpers.py

@@ -1,15 +1,15 @@
 import datetime
 from pathlib import Path
 
-_MIN_DATE = datetime.datetime(year=2024, month=8, day=26)
+MIN_DATE = datetime.datetime(year=2025, month=2, day=21)
 
 def min_date():
   # on systemd systems, the default time is the systemd build time
   systemd_path = Path("/lib/systemd/systemd")
   if systemd_path.exists():
     d = datetime.datetime.fromtimestamp(systemd_path.stat().st_mtime)
-    return d + datetime.timedelta(days=1)
+    return max(MIN_DATE, d + datetime.timedelta(days=1))
-  return _MIN_DATE
+  return MIN_DATE
 
 def system_time_valid():
   return datetime.datetime.now() > min_date()