If I have a specific date of a day, how do I get the date of that day in the previous week?

Question

SEE ANSWER FROM @Basil Bourque for most up to date answer

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For example, if I have a \"Date\" variable \"date1\" with a value of (dd/mm/yyy) 03/07/2011, which is a S

Answer 1

You should use Calendar:

    Calendar date = new GregorianCalendar(2011, Calendar.JULY, 3);
    date.add(Calendar.DAY_OF_MONTH, -7);
    System.out.println(date.getTime());

You can create a calendar from date too:

    Date date1 = new Date(111, Calendar.JULY, 3);//the year field adds 1900 on to it.
    Calendar date = new GregorianCalendar();
    date.setTime(date1);
    date.add(Calendar.DAY_OF_MONTH, -7);
    date2 = date.getTime();

Be aware that:

• Java uses 0 to represent January !
• Date(year, month, day) is deprecated since JDK version 1.1 !

See the GregorianCalendar JavaDoc:

Constructs a GregorianCalendar with the given date set in the default time zone with the default locale. Parameters: year the value used to set the YEAR calendar field in the calendar. month the value used to set the MONTH calendar field in the calendar. Month value is 0-based. e.g., 0 for January. dayOfMonth the value used to set the DAY_OF_MONTH calendar field in the calendar.