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The way day/date attributes are used has changed.  Recall  day/date with time attributes:

Here the day/date act like a guard over time. Hence the time is not considered until the day/date is free.

task t1      # run on Monday @ 10:00
  day monday
  time 10:00
task t1   # run on Monday @ 10:00
   date 05.08.2019
   time 10:00

The definition below in ecflow 4.X.X can produce an unexpected run of task t1, on Monday at  00:00

ecflow 4.X. Day/Date in hierarchy does not guard time attributes in children
...
family f1
   day monday     
   task t1       # runs Monday@00:00 and Monday@10.00
      time 10:00 # time was set free on Sunday

In ecflow 5.X.X the day/date act like a guard over any other time attribute.

Hence the time is not considered until the day is free.

ecflow 5.0
...
family f1
   day monday     # Guards the time, until day/date is free
   task t1
      time 10:00  # runs on Monday@10.00

However, both behave the same way for the following definition.

...
family f1
   time 10:00    # set free on the sunday
   task t1
      day monday # runs Monday@00:00 and Monday@10.00

Repeat with day/date

The behavior of day/date attribute under a repeat has changed from ecflow 4.0.

In ecflow 4.X, if task t1 took longer than 1-hour task t2 would not run.

In ecflow 5.X, once the day monday is free on family f1, it stays free until the automatic re-queue caused by the parent repeat. The net effect being that task t2 will still run, even if we have strayed into Tuesday.

suite s1
  family f
    repeat integer rep 0 1
    family f1
       day monday  
       task t1
            time 23:00 
       task t2
 ...