CODEWITHSUNDEEP
javadatecalendar
user2020899
user2020899

Reputation: 47

calendar month and year before

I have to put a date one week before and then 1 month before. If i try with the days one week before is working but if the day es 5 and it has to change the month is not working, it changes me the year instead. About the month it changes me the year tring addUrl = "";

    SimpleDateFormat sdf = new SimpleDateFormat("dd.mm.yyyy");
    // surround below line with try catch block as below code throws checked
    // exception
    Date endDate = sdf.parse(request.getParameter(field.getId()));
    Calendar cal = DateToCalendar(endDate);
    cal.setTime(endDate);

    SimpleDateFormat formatToSend = new SimpleDateFormat("yyy-mm-dd");

    case "day":
        cal.add(Calendar.DATE, -1);

        addUrl = "startDate=" + formatToSend.format(cal.getTime()) + "&endDate=" + endDateString;
        break;

    case "week":
        cal.add(Calendar.DATE, -6); // number of days to add
        addUrl = "startDate=" + formatToSend.format(cal.getTime()) + "&endDate=" + endDateString;
        break;

    default:
        cal.add(Calendar.MONTH, -1); // number of days to add
        addUrl = "startDate=" + formatToSend.format(cal.getTime()) + "&endDate=" + endDateString;

    }

How i can do that?

Thanks

Upvotes: 0

Views: 157

Answers (3)

Basil Bourque
Basil Bourque

Reputation: 339342

java.time

Never use the terribly-flawed legacy date-time classes such as Date, Calendar, SimpleDateFormat, etc.

Use only java.time classes. For a date only value, without time-of-day, and without time zone, use LocalDate.

Specify your starting date.

LocalDate start = LocalDate.parse( "2025-01-23" ) ;

Calculate yesterday.

LocalDate yesterday = start.minusDays( 1 ) ;

Determine the date a week ago.

LocalDate weekPrior = start.minusWeeks( 1 ) ;

Determine a month ago.

LocalDate monthPrior = start.minusMonths( 1 ) ;

Upvotes: 1

BrendanM
BrendanM

Reputation: 383

Im not sure do i fully understand the question however one potential problem is in your date format

m = Minute in hour

M = Month in year <- maybe the one you want?

See here for more examples.

https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html

Upvotes: 0

Jesper
Jesper

Reputation: 206896

In your SimpleDateFormat objects, you should use MM for months and not mm, because mm means minutes, not months.

SimpleDateFormat sdf = new SimpleDateFormat("dd.MM.yyyy");

SimpleDateFormat formatToSend = new SimpleDateFormat("yyyy-MM-dd");

See the API documentation of java.text.SimpleDateFormat.

Upvotes: 2

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