Implemented setting datetime. (#17)

* Implemented setting datetime. Note the specifics w.r.t. urlencoding and no leading zeros

(cherry picked from commit 3a3b152)

* make pylint happy

* making pylint even happier

daikinapi.py

@@ -1,7 +1,7 @@
 """
 Python module to get metrics from and control Daikin airconditioners
 """
-
+import datetime
 import logging
 import urllib.parse
 
@@ -194,10 +194,28 @@ def _get_datetime(self):
         """
         Example:
         ret=OK,sta=1,cur=2022/12/01 22:01:02,reg=eu,dst=1,zone=10
-        :return:
+        :return: dict
         """
         return self._get("/common/get_datetime")
 
+    def _set_datetime(self, date_time=None):
+        """
+        Example:
+        ret=OK
+        :return: None
+        """
+        if date_time is None:
+            date_time = datetime.datetime.now()
+        date_time = date_time.astimezone(tz=datetime.timezone.utc)
+        data = {
+            'lpw': '',
+            'date': f'{date_time.year:d}/{date_time.month:d}/{date_time.day:d}',
+            'zone': 'GMT',
+            'time': f'{date_time.hour:d}:{date_time.minute:d}:{date_time.second:d}',
+        }
+        data = urllib.parse.urlencode(data)
+        return self._set("/common/notify_date_time", data)
+
     def _do_reboot(self):
         return self._get("/common/reboot")
 
@@ -284,8 +302,8 @@ def datetime(self):
         :return: string of datetime on the device (yyyy/mm/dd HH:MM:SS),
             or None if not retrievable
         """
-        datetime = self._get_datetime()["cur"]
-        return datetime if datetime != "-" else None
+        date_time = self._get_datetime()["cur"]
+        return date_time if date_time != "-" else None
 
     @power.setter
     def power(self, value):
@@ -316,6 +334,10 @@ def wifi_settings(self, value):
         ssid, key = value
         self._set_wifi(ssid, key)
 
+    @datetime.setter
+    def datetime(self, value):
+        self._set_datetime(date_time=value)
+
     def _control_set(self, key, value):
         """
         set a get_control() item via one of the property.setters