REAL FUNCTION  YR2DAY( YYYY )
        INTEGER, INTENT(IN   ) :: YYYY
#if __hpux || _AIX
#define   YR2DAY yr2day_
#elif  __sgi || __sun || __osf__ || __mips__
#define   YR2DAY yr2day_
#endif
    float YR2DAY( const int *yy )
    USE M3UTILIO
    
    ...
    ...
    INTEGER   YR2DAY
    ...
    WRITE (*,* ) YR2DAY( 1980 )	!  is 1.0 / 366.0
    WRITE (*,* ) YR2DAY( 1981 )	!  is 1.0 / 365.0
    ...
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