How to Add One Month to Current Date in Java

How to reduce one month from current date and stored in date variable using java?

Use Calendar:

Calendar cal = Calendar.getInstance();
cal.add(Calendar.MONTH, -1);
Date result = cal.getTime();

How to add one month to a date and get the same day

If you want get 3rd monday of month, then use
set instead of add
date.set(Calendar.DAY_OF_WEEK_IN_MONTH, 3);

if you want add one month to current date, use

date.add(Calendar.MONTH, 1);

EDIT

final Calendar date = Calendar.getInstance();
date.set(2012, Calendar.SEPTEMBER, 17);

int prevDayOfWeekInMonth = date.get(Calendar.DAY_OF_WEEK_IN_MONTH);
int prevDayOfWeek = date.get(Calendar.DAY_OF_WEEK);

date.add(Calendar.MONTH, 1);
date.set(Calendar.DAY_OF_WEEK, prevDayOfWeek);
date.set(Calendar.DAY_OF_WEEK_IN_MONTH, prevDayOfWeekInMonth);

add 1 month from current date using java.sql.Date

The problem with your solution is that you are not doing the calculations in long.

You have to replace 31*24*60*60*1000 with 31l*24l*60l*60l*1000l.

Here is the corrected code snippet:

public static void main (String[] args)
{
    Date kini = new Date();
    java.sql.Date jadwalPengobatan = new java.sql.Date(kini.getTime() + 31l*24l*60l*60l*1000l);
    System.out.println(jadwalPengobatan);
}

Please note that this will only fix your calculation where you are adding 31 days to the current date. If you are looking to add a month which can be of 30, 28 or 29 days also then perhaps you should make use of Calendar.

Today's Date:

2016-02-27

Output:

2016-03-29

How add 30 days in current date?

You need to use

c1.add(Calendar.DAY_OF_YEAR, 30);

instead of

c1.add(Calendar.DATE, 30);

Try this

    Date date = new Date();
    SimpleDateFormat df  = new SimpleDateFormat("YYYY-MM-dd");
    Calendar c1 = Calendar.getInstance();
    String currentDate = df.format(date);// get current date here

    // now add 30 day in Calendar instance 
    c1.add(Calendar.DAY_OF_YEAR, 30);
    df = new SimpleDateFormat("yyyy-MM-dd");
    Date resultDate = c1.getTime();
    String     dueDate = df.format(resultDate);

    // print the result
    Utils.printLog("DATE_DATE :-> "+currentDate);
    Utils.printLog("DUE_DATE :-> "+dueDate);

OUTPUT

2019-06-04 14:43:02.438 E/XXX_XXXX: DATE_DATE :-> 2019-06-04
2019-06-04 14:43:02.438 E/XXX_XXXX: DUE_DATE :-> 2019-07-04

Easiest way to add a month to a java DATE type without using Calendar or Joda?

Given that you have Date imported by default, you can add a number of months to the date object by the following:

public void addMonths(Date date, int numMonths){
    date.setMonth((date.getMonth() - 1 + numMonths) % 12 + 1);
}

NOTE

You can use external classes from Java SE by using their full package name. i.e., even if you cannot add import java.util.Calendar; to the top of you .java file, you can still create a calendar object by executing java.util.Calendar cal = java.util.Calendar.getInstance();

Add some month to current date using java

As a starter: you should use prepared statements instead of concatenating variables in the query string, which is error-prone, unsafe and inefficient.

When it comes to doing date computation: you can do the arithmetics directly in the database. This is somewhat simpler than performing it in your application code.

In MySQL, if you want the current date plus 1 month, just do: current_date + interval 1 month.

Here is an example of your statement, assuming that you want the new date in column date_fin:

INSERT INTO `jardin`.`abonnement` (
    `id`,
    `enf_id`,
    `data_debut`,
    `date_fin`,
    `type`,
    `description`, 
    `statu`, 
    `statu_paiment`
) VALUES (
    ?,
    ?,
    ?,
    current_date + interval 1 month,
    ?,
    ?,
    ?,
    ?
)

Alternatively, if you want to add one month to a date given as parameter:

INSERT INTO `jardin`.`abonnement` (
    `id`,
    `enf_id`,
    `data_debut`,
    `date_fin`,
    `type`,
    `description`, 
    `statu`, 
    `statu_paiment`
) VALUES (
    ?,
    ?,
    ?,
    ? + interval 1 month,
    ?,
    ?,
    ?,
    ?
)

PS: date parameters should be given in format YYYY-MM-DD, with an optional time part (YYYY-MM-DD HH:MI:SS).

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