/*********************************************************************

Goal:
Both SAS and C store datetimes as the number of seconds since some date.
Unfortunately, we use different starting dates.  SAS uses 01Jan1960 and
C uses 01Jan1970 as the starting date.  The goal is to convert C datetime
values to SAS datetime values.


Strategy:
Find the offset, using a datetime constant, and use this offset to make the
conversion.


Documentation: 
"SAS Language, Reference, Version 6, First Edition", pages 115-6, 128-131
**********************************************************************/

/*
'01jan1970:00:00'dt is a SAS datetime constant.  This is the number
of seconds between 01jan1960 and 01jan1970.  Now, just add this number
to the C datetime value.  We now have the number of seconds since
01jan1960, a SAS datetime value.    
*/

data test;
  input cdatetme;
  sasdate = cdatetme + '01jan1970:00:00'dt;
  put sasdate= datetime16.;
cards;
728865000
728865020
728865040
728865050
;
run;