sundatepicker/src/main/java/com/alirezaafkar/sundatepicker/components/JDF.java
public void previousDay() {
        JDN--;
        JDNToIranian();
        JDNToJulian();
        JDNToGregorian();
    }
/**
     * previousDay: Go to previous julian day number (JDN) and adjusts the otehr
     * dates.
     */
Go to previous julian day number (JDN) and adjusts the otehr
dates.
Go to previous julian day number ( JDN ) and adjusts the otehr dates .
public void previousDay() {
        JDN--;
        JDNToIranian();
        JDNToJulian();
        JDNToGregorian();
    }
public void previousDay ( ) { JDN -- ; JDNToIranian ( ) ; JDNToJulian ( ) ; JDNToGregorian ( ) ; }
previousDay: Go to previous julian day number (JDN) and adjusts the otehr
 dates.
previousDay : Go to previous julian day number ( JDN ) and adjusts the otehr dates .