timed: set valid flag (#32061)

* timed: set valid flag

* oops
old-commit-hash: 43832335b8e44e40683ffe6afa226a2d2de0d6ff

common/time.py

@@ -1,6 +1,15 @@
 import datetime
+from pathlib import Path
 
-MIN_DATE = datetime.datetime(year=2024, month=1, day=28)
+_MIN_DATE = datetime.datetime(year=2024, month=3, day=30)
+
+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 _MIN_DATE
 
 def system_time_valid():
-  return datetime.datetime.now() > MIN_DATE
+  return datetime.datetime.now() > min_date()