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How to calculate the date of a given day?

 
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dejunzhu

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Joined: 08 May 2008
Posts: 390
Location: China

PostPosted: Thu Mar 15, 2012 9:46 am    Post subject: How to calculate the date of a given day?
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given a day ,say ' 20130405' , how can I know which day is it within a week? MONDAY? TUESDAY? WEDNESDAY?THURSDAY? FRIDAY? SATURDAY? OR SUNDAY?
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Gnanas N

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Joined: 06 Sep 2007
Posts: 785
Location: Chennai, India

PostPosted: Thu Mar 15, 2012 11:53 am    Post subject:
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http://www.ibmmainframes.com/about36879.html
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Peter cobolskolan

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Joined: 06 Feb 2012
Posts: 104
Location: Sweden

PostPosted: Thu Mar 15, 2012 12:13 pm    Post subject: Reply to: How to calculate the date of a given day?
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There is nothing than programming that solves the problem.
I recommend You read about COBOL Intrinsic Functions and date-functions.
Here is a small program example:
Code:
       Identification Division.
       Program-ID.  DAYNAME.
       Data Division.

       Working-Storage Section.
      * Change to your date
       01 TheDate        Pic 9(08) Value 20120315.
       77 TheDay         Pic 9(01) Binary.

       01 TheTable.
          05 TheDays.
             10 Pic X(09) Value 'Monday'.
             10 Pic X(09) Value 'Tuesday'.
             10 Pic X(09) Value 'Wednesday'.
             10 Pic X(09) Value 'Thursday'.
             10 Pic X(09) Value 'Friday'.
             10 Pic X(09) Value 'Saturday'.
             10 Pic X(09) Value 'Sunday'.
          02 TheDaytab Redefines TheDays.
             05 TheDayName Pic X(09) Occurs 7.

       Procedure Division.
           Compute
               TheDay =
               Function Rem(Function Integer-Of-Date(TheDate), 7)
           End-Compute
           If TheDate = 0
              Move 7 to TheDay
           End-If
           Display 'The name of the day is: ' TheDayName(TheDay)
           GoBack
           .
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