Parse timestamps with '@' before any other checks

nilmdb/utils/time.py

@@ -65,6 +65,14 @@ def parse_time(toparse):
     if toparse == "max":
         return max_timestamp
 
+    # If it starts with @, treat it as a NILM timestamp
+    # (integer microseconds since epoch)
+    try:
+        if toparse[0] == '@':
+            return int(toparse[1:])
+    except (ValueError, KeyError):
+        pass
+
     # If string isn't "now" and doesn't contain at least 4 digits,
     # consider it invalid.  smartparse might otherwise accept
     # empty strings and strings with just separators.
@@ -78,14 +86,6 @@ def parse_time(toparse):
     except (ValueError, OverflowError):
         pass
 
-    # If it starts with @, treat it as a NILM timestamp
-    # (integer microseconds since epoch)
-    try:
-        if toparse[0] == '@':
-            return int(toparse[1:])
-    except (ValueError, KeyError):
-        pass
-
     # If it's parseable as a float, treat it as a Unix or NILM
     # timestamp based on its range.
     try: