java中DateUtils时间工具类详解

本文实例为大家分享了DateUtils时间工具类的具体代码，供大家参考，具体内容如下

package com.example.administrator.myapp; 
 
import java.text.ParseException; 
import java.text.SimpleDateFormat; 
import java.util.Calendar; 
import java.util.Date; 
 
 
 
public class DateUtils { 
 
   
  public static Date getDateBefore(Date d, int day) { 
    Calendar now = Calendar.getInstance(); 
    now.setTime(d); 
    now.set(Calendar.DATE, now.get(Calendar.DATE) - day); 
    return now.getTime(); 
  } 
 
   
  public static Date getDateAfter(Date d, int day) { 
    Calendar now = Calendar.getInstance(); 
    now.setTime(d); 
    now.set(Calendar.DATE, now.get(Calendar.DATE) + day); 
    return now.getTime(); 
  } 
 
   
  public static String getCurrTimeStamp() { 
    long time = System.currentTimeMillis(); 
    String t = String.valueOf(time / 1000); 
    return t; 
  } 
 
   
  public static String date2TimeStamp(String date_str, String format) { 
    try { 
      SimpleDateFormat sdf = new SimpleDateFormat(format); 
      return String.valueOf(sdf.parse(date_str).getTime() / 1000); 
    } catch (Exception e) { 
      e.printStackTrace(); 
    } 
    return ""; 
  } 
 
   
  public static String dateTimeStamp(Date date) { 
    return String.valueOf(date.getTime() / 1000); 
  } 
 
   
  public static Date stringToDate(String str, String format) { 
    SimpleDateFormat sdf = new SimpleDateFormat(format);//小写的mm表示的是分钟 
    Date date = null; 
    try { 
      date = sdf.parse(str); 
    } catch (ParseException e) { 
      e.printStackTrace(); 
    } 
    return date; 
  } 
 
  //将String转化为Date 
  public static Date stringToDate(String str) { 
    return stringToDate(str, "yyyy-MM-dd"); 
  } 
 
 
   
  public static String dateToString(Date date, String format) { 
    SimpleDateFormat sdf = new SimpleDateFormat(format); 
    String result = sdf.format(date); 
    return result; 
  } 
 
  //将时间转化为 年-月-日 的格式 
  public static String dateToString(Date date) { 
    return dateToString(date, "yyyy-MM-dd"); 
  } 
} 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。