To customize time, enable NTP or set the date from the Junos OS CLI.
Enable NTP.
[edit]
security-administrator@hostname:fips# set system ntp server 10.1.1..1 key 1
security-administrator@hostname:fips# set system ntp authentication-key 1 type [sha256] value 12345678
security-administrator@hostname:fips# set system ntp trusted-key 1
security-administrator@hostname:fips# commit
If you do not use NTP, set the date and time from the CLI. Date and time format is
YYYYMMDDHHMM.ss
security-administrator@hostname:fips> set date 201803202034.00
security-administrator@hostname:fips> set cli timestamp