常用日期操作

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C C++C#XML SQL

1.

import java.math.BigDecimal;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;

public class DateUtil {

    /**
    * 按照给定的模式格式化日期
    * @param date Date
    * @param pattern String 格式化模式,如 "yyyy年MM月dd日 E HH:mm:ss.SSS" 将把日期格式化为 "2008年05月20日星期二 14:21:10.781"
    * @return
    */
    public static String format(Date date, String pattern){
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
        return simpleDateFormat.format(date);
    }

    /**
    * 按照默认格式格式化日期
    * @param date Date
    * @return String
    */
    public static String format(Date date){
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy年MM月dd日 E HH:mm:ss.SSS");
        return simpleDateFormat.format(date);
    }

    public static String format(Calendar date, String pattern){
        if(date == null){
            return "0000-00-00 00:00:00";
        }
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
        return simpleDateFormat.format(date.getTime());
    }

    /**
    * 解析日期文本与format刚好相反
    * @param text String
    * @param pattern String
    * @return Date
    */
    public static Date parse(String text, String pattern){
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
        ParsePosition pos = new ParsePosition(0);
        Date date = simpleDateFormat.parse(text, pos);
        if(pos.getIndex() < text.length()){
            System.out.println("错误索引信息 : " + pos.getErrorIndex());
        }
        return date;
    }

    public static Calendar parse2(String text, String pattern){
        Date date = parse(text, pattern);
        return dateToCalender(date);
    }

    public static java.sql.Date parse3(String text, String pattern){
        Date date = parse(text, pattern);
        return new java.sql.Date(date.getTime());
    }

    public static Calendar dateToCalender(Date date){
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar;
    }

    /**
    * 计算两个日期相差多少天
    * @param d1 Date
    * @param d2 Date
    * @return long
    */
    public static long subtract(Date d1, Date d2){
        BigDecimal timeQuantum = new BigDecimal(0);
        BigDecimal bd1 = new BigDecimal(d1.getTime());
        BigDecimal bd2 = new BigDecimal(d2.getTime());
        BigDecimal day = new BigDecimal(24L * 60 * 60 * 1000);
        timeQuantum = bd1.subtract(bd2).divideToIntegralValue(day);
        return timeQuantum.longValue();
    }

    /**
    * 计算两个日期相差多少小时
    * @param d1 Date
    * @param d2 Date
    * @return long
    */
    public static long subtractHour(Date d1, Date d2){
        BigDecimal timeQuantum = new BigDecimal(0);
        BigDecimal bd1 = new BigDecimal(d1.getTime());
        BigDecimal bd2 = new BigDecimal(d2.getTime());
        BigDecimal hour = new BigDecimal(60L * 60 * 1000);
        timeQuantum = bd1.subtract(bd2).divideToIntegralValue(hour);
        return timeQuantum.longValue();
    }

    /**
    * 计算两个日期相差多少分钟
    * @param d1 Date
    * @param d2 Date
    * @return long
    */
    public static long subtractMinute(Date d1, Date d2){
        BigDecimal timeQuantum = new BigDecimal(0);
        BigDecimal bd1 = new BigDecimal(d1.getTime());
        BigDecimal bd2 = new BigDecimal(d2.getTime());
        BigDecimal minute = new BigDecimal(60L * 1000);
        timeQuantum = bd1.subtract(bd2).divideToIntegralValue(minute);
        return timeQuantum.longValue();
    }

    /**
    * 计算两个日期相差多少秒
    * @param d1 Date
    * @param d2 Date
    * @return long
    */
    public static long subtractSecond(Date d1, Date d2){
        BigDecimal timeQuantum = new BigDecimal(0);
        BigDecimal bd1 = new BigDecimal(d1.getTime());
        BigDecimal bd2 = new BigDecimal(d2.getTime());
        BigDecimal second = new BigDecimal(1000L);
        timeQuantum = bd1.subtract(bd2).divideToIntegralValue(second);
        return timeQuantum.longValue();
    }

    /**
    * 解析一个时间间隔
    * @param quantum long 用毫秒数表示的时间段
    * @return String
    */
    public static String parseTimeQuantum(long quantum){
        long day = 0L;
        long hour = 0;
        long minute = 0;
        long second = 0;
        long millisecond = 0;
        long tmp = 0L;

        if(quantum < 1000){
            millisecond = quantum;
            return millisecond + "毫秒";
        }

        millisecond = quantum%1000L;
        second = quantum/1000L;
        if(second < 60){
            return second + "秒" + millisecond + "毫秒";
        }

        tmp = second;
        second = tmp%60L;
        minute = tmp/60L;
        if(minute < 60){
            return minute + "分钟" + second + "秒" + millisecond + "毫秒";
        }

        tmp = minute;
        minute = tmp % 60L;
        hour = tmp / 60L;
        if(hour < 24){
            return hour + "小时" + minute + "分钟" + second + "秒" + millisecond + "毫秒";
        }

        tmp = hour;
        hour = tmp % 24L;
        day = tmp /24L;

        return day + "天" + hour + "小时" + minute + "分钟" + second + "秒" + millisecond + "毫秒";
    }

    public static String getCurrentDateText(){
        return format(new Date(), "yyyy年MM月dd日 E HH:mm:ss.SSS");
    }

    public static boolean isZero(Date date){
        return date.getTime() == -62170185600000L;
    }

    public static int getCurrentYear(){
        Calendar c = Calendar.getInstance();
        return c.get(Calendar.YEAR);
    }

    public static int getCurrentMonth(){
        Calendar c = Calendar.getInstance();
        return c.get(Calendar.MONTH) + 1;
    }

    public static Date getFirstDayOfCurrentMonth(){
        Calendar c = Calendar.getInstance();
        c.set(Calendar.DAY_OF_MONTH, 1);
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);

        return c.getTime();
    }

    public static Date getPreviousMonthBegin(){
        Calendar c = Calendar.getInstance();
        c.set(Calendar.MONTH, c.get(Calendar.MONTH) - 1);
        c.set(Calendar.DAY_OF_MONTH, 1);
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        return c.getTime();
    }

    public static Date getCurrentMonthBegin(){
        Calendar c = Calendar.getInstance();
        c.set(Calendar.DAY_OF_MONTH, 1);
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        return c.getTime();
    }

    public static XMLGregorianCalendar toXMLCalendar(Date d) throws DatatypeConfigurationException{

        GregorianCalendar gc = new GregorianCalendar();
        gc.setTime(d);
        XMLGregorianCalendar xml = DatatypeFactory.newInstance().newXMLGregorianCalendar();
        xml.setYear(gc.get(Calendar.YEAR));
        xml.setMonth(gc.get(Calendar.MONTH)+1);
        xml.setDay(gc.get(Calendar.DAY_OF_MONTH));
        xml.setHour(gc.get(Calendar.HOUR_OF_DAY));
        xml.setMinute(gc.get(Calendar.MINUTE));
        xml.setSecond(gc.get(Calendar.SECOND));
        return xml;
    }

    public static Date toDate(XMLGregorianCalendar x){
        GregorianCalendar gc = x.toGregorianCalendar();
        Date date = gc.getTime();
        return date;
    }


}

2. 测试

    public static void main(String args[]){
       Date date = DateUtil.parse("2008年05月20日星期二 14:21:10.781", "yyyy年MM月dd日 E HH:mm:ss.SSS");
       System.out.println(DateUtil.format(date, "yyyy年MM月dd日 E HH:mm:ss.SSS"));
        System.out.println(parseTimeQuantum(6970797L));
        System.out.println(DateUtil.format(getPreviousMonthBegin(), "yyyy年MM月dd日 E HH:mm:ss.SSS"));
        System.out.println(DateUtil.format(getCurrentMonthBegin(), "yyyy年MM月dd日 E HH:mm:ss.SSS"));

    }

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