Java时间日期工具类

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老是忘，还是记录下 -_-||
package zjhuiwan.cn.helper;

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

/**

• Created by on 2019/4/17.
  */
  public class WeekMonthUtil {

  /**

  • leftDate是否在rightDate之前或相等
  • @param leftDate
  • @param rightDate
  • @return
    */
    public static Boolean beforeOrEquals(Date leftDate, Date rightDate) {
    return leftDate.before(rightDate) || leftDate.equals(rightDate);
    }

  /**

  • leftDate是否在rightDate之后或相等
  • @param leftDate
  • @param rightDate
  • @return
    */
    public static Boolean afterOrEquals(Date leftDate, Date rightDate) {
    return leftDate.after(rightDate) || leftDate.equals(rightDate);
    }

  /**

  • 获取传入时间的当天0点
  • @param date
  • @return
    */
    public static Date getDateZero(Date date) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    calendar.set(Calendar.HOUR_OF_DAY, 0);
    calendar.set(Calendar.MINUTE, 0);
    calendar.set(Calendar.SECOND, 0);
    return calendar.getTime();
    }

  /**

  • 获取传入时间的当天最后一秒
  • @param date
  • @return
    */
    public static Date getDateLast(Date date) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(getDateZero(date));
    calendar.add(Calendar.DAY_OF_MONTH, 1); // 一天后的时间
    calendar.add(Calendar.SECOND, -1);
    return calendar.getTime();
    }

  /**

  • 格式化日期为字符串
  • @param date
  • @return
    */
    public static String getDateStr(Date date, String fmt) {
    SimpleDateFormat sdf = new SimpleDateFormat(fmt);
    return sdf.format(date);
    }

  /**

  • 格式化字符串为日期
  • @param date
  • @return
    */
    public static Date getDateLast(String date, String fmt) {
    SimpleDateFormat sdf = new SimpleDateFormat(fmt);
    Date dateSdf = null;
    try {
    dateSdf = sdf.parse(date);
    } catch (ParseException e) {
    e.printStackTrace();
    }
    return dateSdf;
    }

  /**

  • 获得本周一与当前日期相差的天数
  • @param date
  • @return
    */
    public static int getMondayPlus(Date date) {
    Calendar cd = Calendar.getInstance();
    cd.setTime(date);
    int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK);
    if (dayOfWeek == 1) {
    return -6;
    } else {
    return 2 - dayOfWeek;
    }
    }

  /**

  • 获得当前周的周一
  • @param date
  • @return
    */
    public static Date getCurrentMonday(Date date) {
    int mondayPlus = getMondayPlus(date);
    GregorianCalendar currentDate = new GregorianCalendar();
    currentDate.add(GregorianCalendar.DATE, mondayPlus);
    Date monday = currentDate.getTime();
    return monday;
    }

  /**

  • 获得当前周的周日
  • @param date
  • @return
    */
    public static Date getPreviousSunday(Date date) {
    int mondayPlus = getMondayPlus(date);
    GregorianCalendar currentDate = new GregorianCalendar();
    currentDate.add(GregorianCalendar.DATE, mondayPlus + 6);
    Date monday = currentDate.getTime();
    return monday;
    }

  /**

  • 获得当前月的开始日期
  • @param date
  • @return
    */
    public static Date getMinMonthDate(Date date) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
    return calendar.getTime();
    }

  /**

  • 获得当前月的结束日期
  • @param date
  • @return
    */
    public static Date getMaxMonthDate(Date date) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
    return calendar.getTime();
    }

  /**

  • 获取上N个月
  • @return
    */
    public static Date getPreMonth(Date date, int n) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    calendar.add(Calendar.MONTH, -1 * n);
    return calendar.getTime();
    }

  /**

  • 获取下N个月.
  • @return
    */
    public static Date getNextMonth(Date date, int n) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    calendar.add(Calendar.MONTH, n);
    return calendar.getTime();
    }
    }