diff --git a/acme.sh b/acme.sh
index a55ee41cfa..2791325d7c 100755
--- a/acme.sh
+++ b/acme.sh
@@ -1811,11 +1811,11 @@ _date2time() {
     return
   fi
   #Omnios
-  if python3 -c "import datetime; print(int(datetime.datetime.strptime(\"$1\", \"%Y-%m-%d %H:%M:%S\").timestamp()))" 2>/dev/null; then
+  if python3 -c "import datetime; print(int(datetime.datetime.strptime(\"$1\", \"%Y-%m-%d %H:%M:%S\").replace(tzinfo=datetime.timezone.utc).timestamp()))" 2>/dev/null; then
     return
   fi
   #Omnios
-  if python3 -c "import datetime; print(int(datetime.datetime.strptime(\"$1\", \"%Y-%m-%dT%H:%M:%SZ\").timestamp()))" 2>/dev/null; then
+  if python3 -c "import datetime; print(int(datetime.datetime.strptime(\"$1\", \"%Y-%m-%dT%H:%M:%SZ\").replace(tzinfo=datetime.timezone.utc).timestamp()))" 2>/dev/null; then
     return
   fi
   _err "Cannot parse _date2time $1"