Dear Group,

Can you help me solve the problem with calculating Time Post dose using date
time fomat?  Here is information for subject 1 and I appreciate your help
for code to generate time post dose from the first dose in each individual.


Thank you in advance.

Regards,
Ayyappa

           ID DATE  TIME  1 2/25/2010 14:51  1 2/26/2010 20:26  1 2/27/2010
9:00  1 2/27/2010 21:34  1 2/28/2010 8:18  1 2/28/2010 21:00  1 3/1/2010
9:00  1 3/1/2010 9:20

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