Any impacts by changing the OS system time.

Document ID : KB000123514
Last Modified Date : 22/12/2018
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We are considering the summer time and may adopt it in near future. So, I want to know any impacts on the CA products.
If we adopt the summer time, we will change the OS system date/time with the summer time. (We will add the summer time to the time zone.)
Are there any impacts on the Easytrieve if the OS system time is changed?
MF, z/OS, IBM, Fuhitsu, MSP, HITACHI, VOS3
The Easytrieve gets the date/time by using the IBM TIME macro (SVC 11) which will return the local time. . So, there is no impact if the OS system time is changed. It is that just the gotten date/time are changed based on the system time.