How to add hours to a time value to get a new time

[Vergriffenego]

Hello,

I am working on a dataset that need to calculate a new time. For example, I slept at 00:00 (so) and slept for 6.5 (half) hours, so I got up at 06:00 (new).

id	so (hh:mm)	half (hrs)	new (hh:mm)
7	1:30	3.32
26	1:00	3.73
31	0:00	3.94
68	3:00	3.32
87	0:50	3.23

How can I calculate the "new" variable?

I tried simply to add " so+half" then I got seconds.

[Kurt_Bremser · Accepted solution]

Time values in SAS are counts of seconds, so you need to expand your hours to this:

new = so + (half * 3600);
format new time5.;

The brackets are just there for clarification, mathematically they're not needed (multiplication is done before addition).

[Vergriffenego]

 This worked. Thank you very much!

[s_lassen]

Assuming your input data looks like this (it is better to present is as a data step):

data have;                                                                                                                              
input id so : time. half;                                                                                                               
format so time5.;                                                                                                                       
cards;                                                                                                                                  
7      1:30      3.32                                                                                                                   
26      1:00      3.73                                                                                                                  
31      0:00      3.94                                                                                                                  
68      3:00      3.32                                                                                                                  
87      0:50      3.23                                                                                                                  
;run;   

You can simply convert the hours to seconds (60*60=3600 seconds/hour) and add to get the new time:

data want;                                                                                                                              
  set have;                                                                                                                             
  new=so+half*3600;                                                                                                                     
  format new time5.;                                                                                                                    
run;   

[Vergriffenego]

Thank you for your reply! The solution worked well!