batch file - Cmd window unexpectedly closes -

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i have windows bach program im writing log computer time , down time.

im kinda new coding, have found how math time, dates here , @ robvanderwoude.com.

there found batch file that, using command line:

datediff [date1] [date2]

to days past when run program shuts-down after information gathered.

how program continue working? 

    @echo off     %%a in (%date%) set today=%%a     ::test information     set lastdayran= 03/25/2015     datediff %today% %lastdayran%     pause

the script closing because aren't using call run datediff.bat. when run script without using call, flow transfers second script , stays there. if use call, script flow returns original script once second script completes.

@echo off %%a in (%date%) set today=%%a ::test information set lastdayran= 03/25/2015 call datediff %today% %lastdayran% pause

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