JAVA / JS 中对于日期、时间的操作

1.常用型日期转换类:

 

import java.sql.Date;
import java.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;

 

public class DateUtil {

 /**
  * 得到系统现在的时间
  * 
  * @param formatString
  *            返回的时间字符串形式 默认为: yyyy-MM-dd HH:mm:ss
  * @return String
  */
 public static String getNowTime(String formatString) {

  if (StringUtil.isEmptyString(formatString))
   formatString = "yyyy-MM-dd HH:mm:ss";
  SimpleDateFormat sdf;

  try {

   Timestamp nowtime = new Timestamp(System.currentTimeMillis());
   sdf = new SimpleDateFormat(formatString);
   return sdf.format(nowtime);
  } catch (Exception e) {

   e.printStackTrace(System.err);
  }
  return "";
 }

 /**
  * 把时间型Object对象转化成秒数
  * 
  * @return long
  * @param strDateTime
  *            需要转化的时间型字符串 如:2006-10-01 00:00:00
  * @param strFormat
  *            需要转化的时间型字符串的格式 如:yyyy-MM-dd HH:mm:ss
  * 
  */
 public static long objectToSeconds(Object strDateTime, String strFormat) {

  if (StringUtil.isEmptyString(strDateTime))
   strDateTime = getNowTime(null);
  if (StringUtil.isEmptyString(strFormat))
   strFormat = "yyyy-MM-dd HH:mm:ss";

  try {

   SimpleDateFormat format = new SimpleDateFormat(strFormat);
   java.util.Date date = format.parse(strDateTime.toString());
   long seconds = (date.getTime() / 1000);
   return seconds;
  } catch (ParseException e) {

  }
  return 0;
 }

 /**
  * 把秒数转化成时间型字符串
  * 
  * @param seconds
  *            需要转化的时间总秒数
  * @param strFormat
  *            返回的时间字符串形式 如:yyyy-MM-dd HH:mm:ss
  * @return String
  */
 public static String formatSeconds(long seconds, String strFormat) {

  if (seconds <= 0)
   return "";
  if (StringUtil.isEmptyString(strFormat))
   strFormat = "yyyy-MM-dd HH:mm:ss";

  try {

   SimpleDateFormat format = new SimpleDateFormat(strFormat);
   Date date = new Date(System.currentTimeMillis());
   date.setTime(seconds * 1000);
   return format.format(date);

  } catch (Exception e) {

   ;
  }
  return "";
 }

 /**
  * 把时间类型的Object对象转化为Timestamp
  * 
  * @param strDateTime
  *            Object
  * @param strFormat
  *            转化的字符串(strDateTime)形式 如:yyyy-MM-dd HH:mm:ss
  * @return Timestamp
  */
 public static Timestamp objectToTimestamp(Object strDateTime,
   String strFormat) {

  if (StringUtil.isEmptyString(strDateTime))
   strDateTime = getNowTime(null);
  if (StringUtil.isEmptyString(strFormat))
   strFormat = "yyyy-MM-dd HH:mm:ss";

  try {

   long Seconds = objectToSeconds(strDateTime, strFormat);
   Timestamp time = new Timestamp(Seconds * 1000);
   return time;
  } catch (Exception e) {

   ;
  }
  return null;
 }

 public static Timestamp objectToTimestamp(Object strDateTime) {

  if (StringUtil.isEmptyString(strDateTime))
   return null;

  try {

   return Timestamp.valueOf(strDateTime.toString());
  } catch (Exception e) {

   ;
  }
  return null;
 }

 /**
  * 把时间类型的Object对象转化为字符串
  * 
  * @param timestamp
  *            Object
  * @param strFormat
  *            转化后的字符串形式 如:yyyy-MM-dd HH:mm:ss
  * @return String
  */
 public static String formatObject(Object timestamp, String strFormat) {

  if (StringUtil.isEmptyString(timestamp))
   return "";
  if (StringUtil.isEmptyString(strFormat))
   strFormat = "yyyy-MM-dd HH:mm:ss";
  SimpleDateFormat sdf;
  try {

   sdf = new SimpleDateFormat(strFormat);
   return sdf.format(timestamp);
  } catch (Exception e) {
   ;
  }

  return "";
 }

 /**
  * 把时间型字符串转化成Date
  * 
  * @return Date java.util.Date
  * @param strDateTime
  *            需要转化的时间型字符串 如:2006-10-01 00:00:00
  * 
  */
 public static java.util.Date stringToDate(Object objDateTime) {

  java.util.Date date = null;
  if (StringUtil.isEmptyString(objDateTime))
   return date;

  try {

   SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
   date = format.parse(objDateTime.toString());

   String tmpDate = format.format(date);
   return Date.valueOf(tmpDate);
  } catch (Exception e) {

   ;
  }
  return date;
 }

 /**
  * 取得当天日期 yyyy-MM-dd
  * 
  * @return Date java.util.Date
  * @param
  * 
  */
 public static String currentDay() {
  try {

   // 获取系统当前时间
   Calendar rightNow = Calendar.getInstance();
   SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
   return fmt.format(rightNow.getTime());
  } catch (Exception e) {
   ;
   return null;
  }
 }
   
 /**
  * 格式化当前日期
  * @param pattern
  * @return
  */
 public static java.util.Date currentDay(String pattern) {
  java.util.Date date = new java.util.Date();
  if (StringUtil.isEmptyString(pattern))
   pattern = "yyyy-MM-dd HH:mm:ss";
  SimpleDateFormat fmt = new SimpleDateFormat(pattern);
  String tmpDate = fmt.format(date);
  return Date.valueOf(tmpDate);

 }

 /**
  * 取得前天日期 yyyy-MM-dd
  * 
  * @return
  */
 public static String yesterday(String pattern) {
  try {
   java.util.Date date = null;
   if (StringUtil.isEmptyString(pattern))
    pattern = "yyyy-MM-dd HH:mm:ss";
   // 获取前天的现在时间
   Calendar c4 = Calendar.getInstance();
   c4.add(Calendar.DATE, -1);
   date = c4.getTime();
   java.text.SimpleDateFormat sf = new SimpleDateFormat(pattern);
   String str = sf.format(date);
   return str;
  } catch (Exception e) {
   return "";
  }
 }

 /**
  * 取得当月第一天, yyyy-MM-dd
  * 
  * @return Date java.util.Date
  * @param
  * 
  */
 public static String firstDayofMonth() {
  try {

   // 获取系统当前时间
   Calendar rightNow = Calendar.getInstance();
   SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");

   // 页面初始化的时候,设置开始时间为当月第一天,设置结束时间为当天
   rightNow.set(Calendar.DAY_OF_MONTH, 1);// 设置为1号,当前日期既为本月第一天
   return fmt.format(rightNow.getTime());

  } catch (Exception e) {
   ;
   return null;
  }
 }

 /**
  * 把秒数转化成时间型HH:mm:ss
  * 
  * @param seconds
  *            需要转化的时间总秒数
  * @return String
  */
 public static String formatSecondstoHour(long seconds) {

  if (seconds <= 0)
   return "00:00:00";

  try {
   long h = seconds / 3600;
   long m = (seconds - h * 3600) / 60;
   long s = (seconds - h * 3600) % 60;

   return h + ":" + m + ":" + s;

  } catch (Exception e) {

   ;
   return "00:00:00";
  }

 }
}

 

 

 

2.日期操作

 a. JS 中转化将日期\时间转换成秒:

     // 将时间转化为秒

    <script type="text/javascript" language="javascript">
      <!--
     
       function timeFormat(dataTime){
          var timeStr = new Array(); 
          timeStr = dataTime.split(/[-\s:]/); 
          var timeStr =(new Date(timeStr[0],timeStr[1]-1,timeStr[2],0,0,0)).valueOf();
          return timeStr;
       }

     //-->
   </script>

 

b. java中的时间推算

// 上周六的时间
Calendar c2 = Calendar.getInstance();
c2.add(Calendar.DATE, 0 - c2.get(Calendar.DAY_OF_WEEK));
String date2 = DateUtil.formatObject(c2.getTime(), "yyyy-MM-dd");

// N周前的时间
Calendar c1 = Calendar.getInstance();
c1.add(Calendar.DATE, 0 - (searchPeriod * 7
+ c1.get(Calendar.DAY_OF_WEEK) - 1));
String date1 = DateUtil.formatObject(c1.getTime(), "yyyy-MM-dd");

// 上月底时间
Calendar c1 = Calendar.getInstance();
c1.add(Calendar.DATE, 0 - c1.get(Calendar.DAY_OF_MONTH));
Date date = new Date(c1.getTimeInMillis());
String date1 = DateUtil.formatObject(date, "yyyy-MM-dd");

// 推算到前N年的时间
date.setYear(date.getYear()-searchPeriod);
String date2 = DateUtil.formatObject(date, "yyyy-MM-dd");

 

 

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