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boolean DateCalc_check_date(Z_int year, Z_int month, Z_int day)
{
...
            return(true);
    return(false);
}

boolean DateCalc_leap_year(Z_int year)
{
...
    { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
    { 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
};