1. class SystemTime(ctypes.Structure):
2.     # typedef struct _SYSTEMTIME {
3.     #     WORD wYear;
4.     #     WORD wMonth;
5.     #     WORD wDayOfWeek;
6.     #     WORD wDay;
7.     #     WORD wHour;
8.     #     WORD wMinute;
9.     #     WORD wSecond;
10.     #     WORD wMilliseconds;
11.     # } SYSTEMTIME, *PSYSTEMTIME;
12.     _fields_ = [('Year', ctypes.c_uint16), ('Month', ctypes.c_uint16),
13.                 ('DayOfWeek', ctypes.c_uint16), ('Day', ctypes.c_uint16),
14.                 ('Hour', ctypes.c_uint16), ('Minute', ctypes.c_uint16),
15.                 ('Second', ctypes.c_uint16),
16.                 ('Milliseconds', ctypes.c_uint16)]
17.  
18. def settime(dt):
19.     time = SystemTime()
20.     time.Year = dt.year
21.     time.Month = dt.month
22.     time.DayOfWeek = dt.isoweekday()
23.     time.Day = dt.day
24.     time.Hour = dt.hour
25.     time.Minute = dt.minute
26.     time.Second = dt.second
27.     time.Milliseconds = dt.microsecond // 1000
28.     # BOOL WINAPI SetSystemTime(_In_  const SYSTEMTIME *lpSystemTime);
29.     ctypes.windll.kernel32.SetSystemTime(ctypes.byref(time))
30.  
31. def getntptime(server='pool.ntp.org'):
32.     # Unix epoch is 1.1.1970, NTP is 1.1.1900
33.     system_epoch = datetime.date(*time.gmtime(0)[0:3])
34.     ntp_epoch = datetime.date(1900, 1, 1)
35.     epoch_diff = (system_epoch - ntp_epoch).days * 24 * 3600
36.     client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
37.     data = b'\x1b' + (47 * b'\0')
38.     client.sendto(data, (server, 123))
39.     data, address = client.recvfrom(1024)
40.     if data:
41.         # network (big-endian), 12 * unsigned int, 11th value
42.         epoch = struct.unpack('!12I', data)[10]
43.         print(epoch)
44.         epoch -= epoch_diff
45.         print(epoch)
46.         dt = datetime.datetime.utcfromtimestamp(epoch)
47.         return dt
48.     return False
49.  
50. def main():
51.     settime(getntptime())