fix for DragonflyBSD

just move "date -u -j -f" before the linux branch.

acme.sh

@@ -1811,6 +1811,10 @@ _time() {
 #    2022-04-01 08:10:33   to   1648800633
 #or  2022-04-01T08:10:33Z  to   1648800633
 _date2time() {
+  #Mac/BSD
+  if date -u -j -f "%Y-%m-%d %H:%M:%S" "$(echo "$1" | tr -d "Z" | tr "T" ' ')" +"%s" 2>/dev/null; then
+    return
+  fi
   #Linux
   if date -u -d "$(echo "$1" | tr -d "Z" | tr "T" ' ')" +"%s" 2>/dev/null; then
     return
@@ -1820,10 +1824,6 @@ _date2time() {
   if gdate -u -d "$(echo "$1" | tr -d "Z" | tr "T" ' ')" +"%s" 2>/dev/null; then
     return
   fi
-  #Mac/BSD
-  if date -u -j -f "%Y-%m-%d %H:%M:%S" "$(echo "$1" | tr -d "Z" | tr "T" ' ')" +"%s" 2>/dev/null; then
-    return
-  fi
   #Omnios
   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