The start time could vary anyyhing = greater than 22:30
But your example
29Apr18 01:00:00. 30Apr18 08:00:00
I much less than 22:30. Was that a typo of some flavor.
30Apr18 01:00:00. 30Apr18 08:00:00
Which would likely mean that your rule is "any time after 22:30 on one day gets advanced to 08:00 the next day
and any time prior to 08:00 gets set to 08:00 for the same day".
Example of the above rule:
data want; input starttime datetime.; format starttime datetime.; if timepart(starttime) ge '22:30't then wanttime=dhms(datepart(starttime)+1,8,0,0); else if timepart(starttime) < '08:00't then wanttime=dhms(datepart(starttime),8,0,0); else wanttime=starttime; format wanttime datetime.; datalines; 29Apr18:22:30:00 30Apr18:01:00:00 30Apr18:12:00:00 ; run;
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