Setting Daylight Savings Time on a Cisco MDS switch

I recently ran into a log time difference at a customer’s site so I want to repeat my blog from last year (Configuring the timezone and NTP). It’s slightly different on Cisco LAN / Routing equipment, but on Cisco MDS SAN switches the DST configuration is set by using the following commands:

config t
clock summer-time CEST 5 Sun Mar 02:00 5 Sun Oct 03:00 60
exit
copy run start

  • CEST means Central Europe Summer Time (you can use your timezone name instead if you like)
  • the first 5, followed by “Sun” means that the DST will become active on the LAST (5th, sometimes the 4th) Sunday of the month following the day you just named (March)
  • 02:00 is the time of day when the DST will become active (time will go forward)
  • the second 5, followed by “Sun” means that the DST will become active on the LAST (5th, sometimes the 4th) Sunday of the month following the day you just named (October)
  • 03:00 is the time of day when the DST will end (time will go back to normal, backwards, so from 03:00 in my example the clock will go back to 02:00)

You can check the date, time and timezone by typing “show clock”.

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