Convert Date in Millisecond to Today, Yesterday, Last 7 Days, Last 30 Days in Java

Question

I have some documents and its created time is in milliseconds. I need to separate them as Today, Yesterday, Last 7 Days, Last 30 Days, More than 30 Days.

I used the following code:convertSimpleDayFormat(1347022979786);

public static String convertSimpleDayFormat(Long val) {


            long displayTime = System.currentTimeMillis() - val;
            displayTime = displayTime/86400000;
            String displayTimeVal = "";
            if(displayTime <1)
            {
                    displayTimeVal = "today";  
            }
            else if(displayTime<2)
            {
                    displayTimeVal = "yesterday";
            } 
            else if(displayTime<7)
            {
                    displayTimeVal = "last7days";
            } 
            else if(displayTime<30)
            {
                    displayTimeVal = "last30days";
            }
            else
            {
                    displayTimeVal = "morethan30days";
            }
            return displayTimeVal;
    }

I am subtracting the current time and passing the milliseconds and converting to one day.

But the issue I'm facing is, I couldn't calculate the exact time for the date in milliseconds.

I want to calculate for Today as: From Midnight 00:00 to Midnight 24:00. (Exactly for 24 hours.)

Similarly I want to exactly convert the Milliseconds into Today, Yesterday, Last 7 days, Last 30 Days and More than 30 Days.

Answer 1

private static Calendar clearTimes(Calendar c) {
    c.set(Calendar.HOUR_OF_DAY,0);
    c.set(Calendar.MINUTE,0);
    c.set(Calendar.SECOND,0);
    c.set(Calendar.MILLISECOND,0);
    return c;
}

public static String convertSimpleDayFormat(long val) {
    Calendar today=Calendar.getInstance();
    today=clearTimes(today);

    Calendar yesterday=Calendar.getInstance();
    yesterday.add(Calendar.DAY_OF_YEAR,-1);
    yesterday=clearTimes(yesterday);

    Calendar last7days=Calendar.getInstance();
    last7days.add(Calendar.DAY_OF_YEAR,-7);
    last7days=clearTimes(last7days);

    Calendar last30days=Calendar.getInstance();
    last30days.add(Calendar.DAY_OF_YEAR,-30);
    last30days=clearTimes(last30days);


    if(val >today.getTimeInMillis())
    {
            return "today";  
    }
    else if(val>yesterday.getTimeInMillis())
    {
        return "yesterday";
    } 
    else if(val>last7days.getTimeInMillis())
    {
        return "last7days";
    } 
    else if(val>last30days.getTimeInMillis())
    {
        return "last30days";
    }
    else
    {
        return "morethan30days";
    }
}