Java/android calculates tomorrow, today, yesterday, and the day after

java/android Calculate today, tomorrow, the day after, yesterday, the day before last method, the key is to know the time zone, if it is Beijing, the time zone East 8 area,

The system initial time is 1970-01-01 80:00:00, note is starting from eight o'clock, calculate the time to add back

Get the time zone method as follows:

Calendar.getinstance (). getTimeZone (). Getrawoffset ();

The calculation method is as follows:

-2: The day before yesterday,-1: Yesterday, 0: Today, 1: Tomorrow, 2: the day after

public static String Gettodayoryesterday (long date) {//date is a stored timestamp
        //time zone 8, the system initial time is 1970-01-01 80:00:00, note is starting from eight o'clock, Add it back to the calculation.
        int offSet = Calendar.getinstance (). getTimeZone (). Getrawoffset ();
        Long today = (System.currenttimemillis () +offset)/86400000;
        Long start = (date+offset)/86400000;
        Long intervaltime = Start-today;
        -2: The day before yesterday,-1: Yesterday, 0: Today, 1: Tomorrow, 2: The acquired
        String strdes= "";
        if (intervaltime==0) {
            strdes= getcontext (). Getresources (). getString (R.string.today);//Today
        }else if ( Intervaltime==-1) {
            strdes= getcontext (). Getresources (). getString (R.string.yesterday);//Yesterday
        }else{
            strdes=getformatdate (date);//Show Time directly
        }
        return strdes;
    }

Address: http://blog.csdn.net/jason_996/article/details/51314214