Wordclock - Update to handle different timezones

examples/word_clock.py

@@ -20,6 +20,8 @@
 
 # Length of time between updates in minutes.
 UPDATE_INTERVAL = 15
+# Offset in hours from UTC, ie -5 for NY (UTC - 5), 1 for Paris
+UTC_OFFSET = 0
 
 rtc = machine.RTC()
 time_string = None
@@ -32,6 +34,27 @@
 # Set the correct time using the NTP service.
 ntptime.settime()
 
+# adjust utc time by offset hours
+def adjust_to_timezone(rtc_datetime, offset_hours):
+
+    # extract the time components from our tuple
+    year, month, day, _, hours, minutes, seconds, _ = rtc_datetime
+
+    # convert the current datetime tuple to a timestamp
+    utc_timestamp = time.mktime((year, month, day, hours, minutes, seconds, 0, 0))
+
+    # apply the timezone offset in seconds
+    adjusted_timestamp = utc_timestamp + (offset_hours * 3600)
+
+    # convert the adjusted timestamp back to a local datetime tuple
+    adjusted_time = time.localtime(adjusted_timestamp)
+
+    # extract adjusted values
+    hours, minutes = (adjusted_time[3], adjusted_time[4])
+
+    return hours, minutes
+
+
 def approx_time(hours, minutes):
     nums = {0: "twelve", 1: "one", 2: "two",
             3: "three", 4: "four", 5: "five", 6: "six",
@@ -61,7 +84,10 @@ def update():
         print("Unable to contact NTP server")
 
     current_t = rtc.datetime()
-    time_string = approx_time(current_t[4] - 12 if current_t[4] > 12 else current_t[4], current_t[5])
+    # perform timezone adjustment here (relative to UTC)
+    adjusted_hr, adjusted_min = adjust_to_timezone(current_t, UTC_OFFSET)
+
+    time_string = approx_time(adjusted_hr - 12 if adjusted_hr > 12 else adjusted_hr, adjusted_min)
 
     # Splits the string into an array of words for displaying later
     time_string = time_string.split()