VMAX Storage availability

Hello,

Using the below command I can get the power-on time of the Symmetrix.

symcfg list -v -sid

If my system was  down for a certain period and gets back online after some time. I s there any way we can measure  the time between when Symmetrix was Powered Off, and the next time it is powered on? Is there any CLI command which can provide me this information?

Also, please help me understand the difference between the below two lines, which time does it show?

Symmetrix Last IPL Time (Cold)
Symmetrix Last Fast IPL Time (Hot)