Set Calendar to first week of a month in Java

Question

i'm trying to set Calendar object -> today to a particular day of first week of a month.

    Calendar today = Calendar.getInstance();

    today.set(Calendar.HOUR_OF_DAY, 0); // ! clear would not reset the hour of day !
    today.clear(Calendar.MINUTE);
    today.clear(Calendar.SECOND);
    today.clear(Calendar.MILLISECOND);
    today.getTime();

    today.set(Calendar.YEAR,year);
    today.set(Calendar.MONTH, month);
    today.set(Calendar.WEEK_OF_MONTH,today.getActualMinimum(Calendar.WEEK_OF_MONTH));
    today.set(Calendar.DAY_OF_WEEK, getDay()+1);

    Log.d(TAG, "Test : "+getName()+", time : "+ today.getTime()+"  ,year : "+year+"   ,month : "+ month);

problem is, the calendar is returning the date of day set of current week.

score 3 · Answer 1 · answered Feb 28 '17 at 13:39

3

Use below code:

public static String getEightWeeksDateString() {
    DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-01 00:00:00");
    Calendar cal = Calendar.getInstance();
    cal.add(Calendar.DATE, 0);
    return dateFormat.format(cal.getTime());
}

This return Date in string format, then you should convert it into what u want

answered Feb 28 '17 at 13:39

Pranay Kumbhalkar

701
6
18

the above method returns string of first date of month, but i want to set `today ` to one particular day of first week. – Manthri Anvesh Feb 28 '17 at 13:44
just change return statement and convert into date directoly – Pranay Kumbhalkar Feb 28 '17 at 13:48
sorry, i dnt get you. i would appreciate if you explain by code. – Manthri Anvesh Feb 28 '17 at 13:51
public static Date getEightWeeksDateString() throws ParseException { DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-01 00:00:00"); Calendar cal = Calendar.getInstance(); cal.add(Calendar.DATE, 0); String str=dateFormat.format(cal.getTime()); return new SimpleDateFormat("yyyy-MM-01 00:00:00").parse(str); } – Pranay Kumbhalkar Feb 28 '17 at 13:55
try this and modify date pattern if u want – Pranay Kumbhalkar Feb 28 '17 at 13:56

score 0 · Answer 2 · answered Feb 28 '17 at 13:13

0

 Calendar c = Calendar.getInstance();   // this takes current date
    c.set(Calendar.DAY_OF_MONTH, 1);

answered Feb 28 '17 at 13:13

theendcomplete

69
10

i put the line, but still it returned the same – Manthri Anvesh Feb 28 '17 at 13:18
http://stackoverflow.com/questions/14241836/get-first-date-of-current-month-in-java Calendar c = Calendar.getInstance(); // this takes current date c.set(Calendar.DAY_OF_MONTH, 1); System.out.println(c.getTime()); // this returns java.util.Date – theendcomplete Feb 28 '17 at 13:20
i want to set the day of week to `day`, and week to first week of month. – Manthri Anvesh Feb 28 '17 at 13:26

score 0 · Answer 3 · answered Feb 28 '17 at 13:18

0

There is a DAY_OF_MONTH field in class calendar, which you are required to change if you want to accomplish your goal. Look in documentation. You just need to use set method :

today.set(Calendar.DAY_OF_MONTH, 1);

answered Feb 28 '17 at 13:18

Wiktor Sznyra

30
1
7

1

still it returns the same. – Manthri Anvesh Feb 28 '17 at 13:22

score 0 · Answer 4 · answered Feb 28 '17 at 14:10

You can use the below code. It will return the date as same day as of today but for first week of month.

public String getDayFromFirstWeek() {
    DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy",Locale.getDefault());

    Calendar date = Calendar.getInstance(Locale.getDefault());
    date.set(Calendar.DAY_OF_MONTH, 1);
    date.add(Calendar.DAY_OF_YEAR, (date.get(Calendar.DAY_OF_WEEK)+ Calendar.getInstance().get(Calendar.DAY_OF_WEEK) - 1) % 7);
    return formatter.format(date.getTime());
}

Set Calendar to first week of a month in Java

4 Answers4