ntplib based time checker

checker.py

# /// script
# requires-python = ">=3.10"
# dependencies = [
#     "ntplib",
# ]
# ///

import time,ntplib
from datetime import datetime
import sys

def main() -> None:
    if len(sys.argv) < 2:
        print("Usage: ntp_check.py [server]")
        sys.exit(1)
    server = sys.argv[1]
    ntp_client = ntplib.NTPClient()
    current = datetime.now().timestamp()
    response = ntp_client.request(server)
    time_str = response.tx_time
    ntp_date = time.strftime('%Y-%m-%d',time.localtime(time_str)) 
    ntp_time = time.strftime('%X',time.localtime(time_str))
    date = time.strftime('%Y-%m-%d',time.localtime(current))
    c_time = time.strftime('%X',time.localtime(current))
    print("Current system time:", date, c_time)
    print("NTP server time:", ntp_date, ntp_time)
    offset = response.offset
    print("diff: {:.3f} mintues".format(offset))
    # os.system('date {} && time {}'.format(ntp_date,ntp_time))
    print("try faketime with")
    if offset > 0:
        offset = "+" + str(offset)
    print("faketime -f '{}' command ".format(offset))

if __name__ == "__main__":
    main()