added am_pm fixes (#1810)

Author: reidStarzl

kivymd/uix/pickers/timepicker/timepicker.py

@@ -694,26 +694,44 @@ def __init__(self, **kwargs):
             am_pm=self._set_current_time,
         )
         Clock.schedule_once(
-            lambda x: self.set_time(
-                datetime.time(hour=int(self.hour), minute=int(self.minute))
-            )
+                lambda x: self._set_time_init()
         )  # default time
 
+    def _set_time_init(self):
+        """Sets time dialog to current hour/minute/am_pm values at init"""
+
+        if int(self.hour) > 12:
+            self.am_pm = 'pm'
+            self.hour = str(int(self.hour) - 12)
+        elif int(self.hour) == 0: 
+            self.am_pm = 'am'
+            self.hour = '12'
+
+        self._set_time_input(self.hour, self.minute)
+        self._set_dial_time(self.hour, self.minute)
+        self._set_am_pm(self.am_pm)
+        self._set_current_time()
+
     def set_time(self, time_obj: datetime.time) -> None:
         """Manually set time dialog with the specified time."""
-
+         
         hour = time_obj.hour
         minute = time_obj.minute
-
-        if hour > 12:
-            hour -= 12
-            mode = "pm"
+        
+        self._set_time_input(hour, minute)
+        
+        if hour < 12:
+            mode = 'am'
         else:
-            mode = "am"
+            mode = 'pm'
+        
+        if hour == 0:
+            hour = 12
+        elif hour > 12:
+            hour -= 12
 
         hour = str(hour)
         minute = str(minute)
-        self._set_time_input(hour, minute)
         self._set_dial_time(hour, minute)
         self._set_am_pm(mode)
         self._set_current_time()