chkdate.h

A check date valid program interface and implementation

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** 1. PARM-DATE : DATE FOR CHECKING                           
** 2. PARM-TYPE : KIND OF DATE                                
**    2.1  'YMD' - YY/MM/DD                                   
**    2.2  'MDY' - MM/DD/YY                                   
**    2.3  'DMY' - DD/MM/YY                                   
** 3. PARM-WE   :  ﹁じ