isDoubledMonth static method
CHECK IF IT IS DOUBLE MONTH OR NOT
Implementation
static isDoubledMonth(int tYear, int month) {
var mp = 12 * (tYear - YEAR_DIFF - YEAR0) + month;
return (2 * mp) % 65 == BETA % 65 || (2 * mp) % 65 == (BETA + 1) % 65;
}