Current status:
c3750# sh clock detail
12:02:37.640 UTC Wed Sep 26 2018
Time source is user configuration
Set time zone and DST:
c3750(config)# clock timezone EST 2 # Kyiv, Ukraine
c3750(config)# clock summer-time EET recurring last Sat Mar 3:00 last Sat Oct 4:00
Set NTP server address:
c3750(config)# ntp server 172.22.80.11 prefer
Check results:
c3750# sh clock detail
.12:22:19.560 EET Wed Sep 26 2018
Time source is NTP
Summer time starts 03:00:00 EST Sat Mar 31 2018
Summer time ends 04:00:00 EET Sat Oct 27 201
c3750# show ntp status
Clock is unsynchronized, stratum 16, no reference clock
nominal freq is 119.2092 Hz, actual freq is 119.2093 Hz, precision is 2**18
reference time is DF55CC99.24F3E418 (12:15:05.144 EET Wed Sep 26 2018)
clock offset is -6.2347 msec, root delay is 46.11 msec
root dispersion is 59.42 msec, peer dispersion is 7.84 msec
c3750# show ntp associations
address ref clock st when poll reach delay offset disp
~172.22.80.11 0.0.0.0 16 - 64 0 0.0 0.00 16000.
* master (synced), # master (unsynced), + selected, - candidate, ~ configured