Java Month Day getFirstDayOfMonth(Calendar c)

Here you can find the source of getFirstDayOfMonth(Calendar c)

Description

get First Day Of Month

License

Apache License

Declaration

public static Date getFirstDayOfMonth(Calendar c) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class Main {
    public static SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");

    public static Date getFirstDayOfMonth(Calendar c) {
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = 1;
        c.set(year, month, day, 0, 0, 0);
        return c.getTime();
    }/*from  w  w w.  jav a  2 s  .  co  m*/

    public static int get(int field, Date date) {
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        return c.get(field);
    }

    /**
     * Sets the specified field to a date returning a new object.  
     * This does not use a lenient calendar.
     * The original date object is unchanged.
     *
     * @param date  the date, not null
     * @param calendarField  the calendar field to set the amount to
     * @param amount the amount to set
     * @return a new Date object set with the specified value
     * @throws IllegalArgumentException if the date is null
     * @since 2.4
     */
    private static Date set(Date date, int calendarField, int amount) {
        if (date == null) {
            throw new IllegalArgumentException("The date must not be null");
        }
        // getInstance() returns a new object, so this method is thread safe.
        Calendar c = Calendar.getInstance();
        c.setLenient(false);
        c.setTime(date);
        c.set(calendarField, amount);
        return c.getTime();
    }

    public static String getTime(String pattern) {
        return new SimpleDateFormat(pattern).format(new Date());
    }
}

Related

  1. getFirstday_Month(Date date, int months)
  2. getFirstDayOfCurMonth()
  3. getFirstDayOfCurrentMonth()
  4. getFirstDayOfLastMonth()
  5. getfirstDayOfMonth()
  6. getFirstDayOfMonth(Date date)
  7. getFirstDayOfMonth(Date date)
  8. getFirstDayOfMonth(Date date)
  9. getFirstDayOfMonth(Date date)