NTP,Clock

soodar1# show clock 
               Local time: Thu 2020-09-24 06:44:30 UTC
           Universal time: Thu 2020-09-24 06:44:30 UTC
                 RTC time: Thu 2020-09-24 06:43:47
                Time zone: UTC (UTC, +0000)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

n1(config)# clock timezone Asia/Tehran
n1(config)# do sh clock 
               Local time: Thu 2020-09-24 10:15:19 +0330
           Universal time: Thu 2020-09-24 06:45:19 UTC
                 RTC time: Thu 2020-09-24 06:44:36
                Time zone: Asia/Tehran (+0330, +0330)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

n1(config)# ntp server ir.pool.ntp.org
n1(config)# do sh ntp server status 
       Server: 77.104.70.70 (ir.pool.ntp.org)
Poll interval: 32s (min: 32s; max 34min 8s)
         Leap: normal
      Version: 4
      Stratum: 3
    Reference: C2E19619
    Precision: 1us (-21)
Root distance: 74.980ms (max: 5s)
       Offset: +42.555603s
        Delay: 53.354ms
       Jitter: 0
 Packet count: 1
    Frequency: +0.000ppm

soodar(config)# clock set 10:40:45 2 23 2020
Failed to set time: Automatic time synchronization is enabled
Failed to set time: Automatic time synchronization is enabled

n1(config)# no ntp 

n1(config)# clock set 12:12:12 
  (1-12)  Month of the year
n1(config)# clock set 12:12:12 12 
  (1-31)  Day of the month
n1(config)# clock set 12:12:12 12 12 
  (2000-4192)  Year( no abbreviation)
n1(config)# clock set 12:12:12 12 12 2020
n1(config)# do sh clock 
               Local time: Sat 2020-12-12 12:12:14 +0330
           Universal time: Sat 2020-12-12 08:42:14 UTC
                 RTC time: Sat 2020-12-12 08:42:15
                Time zone: Asia/Tehran (+0330, +0330)
System clock synchronized: no
              NTP service: inactive
          RTC in local TZ: no