st: FW: working with date & time variables when time refers to 01jan1960

["Mendoza Aldana, Dr Jorge Antonio (WPRO)" <MendozaAldanaj@wpro.who.int>]

Dear Statalist,
I've received a dataset containing date (date1 and date2) and time (time1 and time2) variables; time1 is the time on date1 when an event happened; the same for time2 and date2. 
I need to compute the difference in minutes between date1_time1 to date2_time2. But, the format of time1 and time2 is e.g. "01Jan1960 10:20:00". 

the data looks like below,

date1       time1               date2      time2
05may2010   01jan1960 10:00:00  05may2010  01jan1960 10:40:00
10may2011   01jan1960 23:50:00  11may2011  01jan1960 00:30:00

So, I need to find a way to calculate the difference in minutes, which in the examples above is 40 minutes.
I am using Stata 11 on Windows XP.
I would appreciate ideas or links to references on how to solve this.
Jorge





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