add Day to date - Android java.util

Android examples for java.util:Day

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Description

add Day to date

Demo Code

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

public class Main{
  public static final String YEAR = "yyyy";
  public static final String MONTH = "MM";
  public static final String DAY = "dd";
  public static final String FULL_TIME = "HH:mm:ss";
  public static final String YEAR_MONTH = YEAR + "-" + MONTH;
  public static final String FULL_DATE = YEAR_MONTH + "-" + DAY;
  public static final String FULL_DATE_TIME = FULL_DATE + " " + FULL_TIME;
  public static final String FULL_TIME_ZONE = FULL_DATE + "'T'"
          + FULL_TIME + "'Z'";

  /**//from w w w. j  a v a 2s  .  com
   * <br>
   * Convert date format
   * @param format
   * @param date
   * @return String
   */
  private static String format(String format, Date date) {
      SimpleDateFormat f = new SimpleDateFormat(format);
      return f.format(date);
  }

  /**
   * <br>
   * From now to a few days ago or after few days
   * @param move
   * @return yyyy-MM-dd
   */
  public static String addDay(int $add) {
      Calendar calendar = Calendar.getInstance();
      return addDay(format(FULL_DATE, calendar.getTime()), $add,
              FULL_DATE);
  }
  /**
   * <br>
   * From now to a few days ago or after few days
   * @param $add
   * @param $format ?? ? format? ??? format? ??? ?
   * @return format
   */
  public static String addDay(int $add, String $format) {
      Calendar calendar = Calendar.getInstance();
      return addDay(format($format, calendar.getTime()), $add, $format);
  }
  /**
   * <br>
   * From 'dateStr' to a few days ago or after few days
   * @param dateStr
   * @param move days
   * @return yyyy-MM-dd
   */
  public static String addDay(String $dateStr, int moveDays) {
      return addDay($dateStr, moveDays, FULL_DATE);
  }
  /**
   * <br>
   * From 'dateStr' to a few days ago or after few days
   * @param $dateStr
   * @param move days
   * @param $format
   * @return $format
   */
  public static String addDay(String dateStr, int moveDays, String format) {
      return addDay(dateStr, moveDays, format, format);
  }
  /**
   * $dateStr? ?? $add ? ? <br>
   * @param $dateStr
   * @param $add
   * @param $inFormat ?? ? format
   * @param $outFormat ??? format
   * @return
   */
  public static String addDay(String $dateStr, int $add,
          String $inFormat, String $outFormat) {
      try {
          Date date = new SimpleDateFormat($inFormat).parse($dateStr);

          Calendar calendar = Calendar.getInstance();
          calendar.setTime(date);
          calendar.set(Calendar.DAY_OF_MONTH,
                  calendar.get(Calendar.DAY_OF_MONTH) + $add);
          return format($outFormat, calendar.getTime());
      } catch (ParseException e) {
          return $dateStr;
      }
  }
}

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