added some helpers around timestamps

EagleEyev3/__init__.py

@@ -36,6 +36,7 @@ class EagleEyev3():
         self.switches = []
         self.users = []
         self.accounts = []
+        self.user_tz_obj = None
 
         self.lazy_login = True
 
@@ -77,6 +78,21 @@ class EagleEyev3():
         self.get_base_url(cascade=True)
 
 
+    def time_now(self):
+        return datetime.now(tz=self.user_tz_obj).isoformat(timespec='milliseconds')
+
+
+    def time_before(self, ts=None, hours=6):
+        if ts == None:
+            ts = datetime.now(tz=self.user_tz_obj)
+
+        if type(ts) == str:
+            ts = datetime.fromisoformat(ts)
+
+        return (ts - timedelta(hours=hours)).isoformat(timespec='milliseconds')
+
+
+
     def login_tokens(self, code=None, cascade=True):
         """
         Obtains login tokens using the authorization code.