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st: ntimeofday-- format and calculation problems with date and time


From   Alison McCarthy <statslearner@live.com>
To   stata <statalist@hsphsun2.harvard.edu>
Subject   st: ntimeofday-- format and calculation problems with date and time
Date   Sun, 20 Feb 2011 14:54:18 +1100

Dear statalist
I have imported dates and time from excel and wish to convert these into a format suitable for analysis. My variables read as follows:

ID	arrivaltime		       Outcome3	19/02/2011 22:20       injury	
My end-goal is to do a survival analysis, but to do this,  I believe I need to convert variables into the stata date/time formats.
The program that seems to handle the above best if Nick Cox's  "ntimeofday"
The variable I generate using this formulation is:
ntimeofday arrivaltime, gen(ARRIVED) s (dmy h min) n(day) cend(2050).
I have then tried to format the new variable into:
dd-mm-yyyy  hh-mm
However, I cannot seem to make this work. If anyone could tell me what I am doing wrong I would be most grateful.Best wishesAllison 		 	   		  
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