Do you know what the correct date or date-time value is, which this value represents? If it is a millisecond timestamp, is it number of milliseconds since what zero point?
If it's number of milliseconds, you could convert it to number of seconds, but you need to know the zero point. If the 0 is Jan 1, 1960, then it would represent 24Apr2015 at 4:00am:
18 data a ;
19 x=1.7454672E12 ;
20 x=x/1000 ;
21 format x datetime19. ;
22 put x= ;
23 run ;
x=24APR2015:04:00:00
NOTE: The data set WORK.A has 1 observations and 1 variables.
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