When we add new dates to a calendar, all the start times for the jobs using that calendar are recalculated. Is this a normal behavior ?
Workload Automation AE (any release)
Yes, this is a normal behavior. It is documented in "WA AE Release 11.3.6 Reference Guide", page 69 :
"When you update a calendar, CA Workload Automation AE recalculates the starting times for all jobs that use the updated calendar."
To avoid any side effects, the recommended solution is to update a calendar only when there are No jobs running that references the calendar.