Add optional timezone offset for NTP.set_time()

Author: theelectricmayhem

adafruit_ntp.py

@@ -48,7 +48,7 @@
 
 class NTP:
     """Network Time Protocol (NTP) helper module for CircuitPython.
-    This module does not handle daylight savings or local time.
+    This module does not handle daylight savings time.
 
     :param adafruit_esp32spi esp: ESP32SPI object.
     """
@@ -61,13 +61,16 @@ def __init__(self, esp):
             raise TypeError("Provided object is not an ESP_SPIcontrol object.")
         self.valid_time = False
 
-    def set_time(self):
+    def set_time(self, tz_offset=0):
         """Fetches and sets the microcontroller's current time
-        in seconds since since Jan 1, 1970.
+        in seconds since since Jan 1, 1970.  Optionally offsets
+        the current time to that of the requested timezone.
+        
+        :param int tz_offset: Timezone offset from GMT in hours
         """
         try:
             now = self._esp.get_time()
-            now = time.localtime(now[0])
+            now = time.localtime(now[0]+ (tz_offset * 3600))   # 3600 seconds in an hour
             rtc.RTC().datetime = now
             self.valid_time = True
         except ValueError: