计算时间

清疚 2022-08-27 12:00 171阅读 0赞

import java.util.Calendar;  
import java.util.Date;  
/\*\*  
 \* 功能：计算时间  
 \* 上月开始、上月结束、本月开始、本月结束、上周开始、上周结束、本周开始、本周结束、昨天开始、昨天结束、今天开始、今天结束  
 \* @see  
 \* @version 2007-06-07  
 \*  
 \*/

public class StartAndEndOfDate \{  
    public static enum DateTag \{LAST\_MONTH\_START,LAST\_MONTH\_END,THIS\_MONTH\_START,THIS\_MONTH\_END,LAST\_WEEK\_START,LAST\_WEEK\_END,  
        THIS\_WEEK\_START,THIS\_WEEK\_END,YESTERDAY\_START,YESTERDAY\_END,TODAY\_START,TODAY\_END,NOW\};  
     
    /\*\*  
     \* 功能：计算时间  
     \* 上月开始、上月结束、本月开始、本月结束、上周开始、上周结束、本周开始、本周结束、昨天开始、昨天结束、今天开始、今天结束  
     \* 格式：2007-06-01 00:00:00  2007-06-30 23:59:59  
     \* 本月结束、本周结束、今天结束 都指的是当前日期时间  
     \* 一周按照：星期一至星期天来计算  
     \* @param tag  
     \* @return String  
     \*/  
    public static String getStartAndEndDate(DateTag tag)\{  
        String resultString;  
        Calendar cal = Calendar.getInstance();  
        Date date = new Date();  
        java.text.DateFormat formatFull = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
        String now = formatFull.format(date);  
        java.text.DateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd");  
        switch (tag)\{  
            case LAST\_MONTH\_START://上月开始  
                cal.add(Calendar.MONTH, -1);  
                cal.set(Calendar.DATE, 1);  
                String lastMonthStart = format.format(cal.getTime())+" 00:00:00";//上月开始（上月1号）  
                cal.clear();  
                resultString = lastMonthStart;  
                break;  
            case LAST\_MONTH\_END://上月结束  
                cal=Calendar.getInstance();  
                cal.add(Calendar.MONTH, -1);  
                cal.set(Calendar.DATE,cal.getActualMaximum(Calendar.DAY\_OF\_MONTH));  
                String lastMonthEnd = format.format(cal.getTime())+" 23:59:59";//上月结束（上月最后一天）  
                cal.clear();  
                resultString = lastMonthEnd;  
                break;  
            case THIS\_MONTH\_START://本月开始  
                cal=Calendar.getInstance();  
                cal.add(Calendar.MONDAY,0);  
                cal.set(Calendar.DAY\_OF\_MONTH, 1);  
                String thisMonthStart = format.format(cal.getTime())+" 00:00:00";//本月开始（本月1号）  
                cal.clear();  
                resultString = thisMonthStart;  
                break;  
            case THIS\_MONTH\_END://本月结束  
                String thisMonthEnd = now;//本月结束（即：当前时间）  
                resultString = thisMonthEnd;  
                break;  
            case LAST\_WEEK\_START://上周开始  
                cal=Calendar.getInstance();  
                cal.add(Calendar.WEEK\_OF\_YEAR, -1);  
                cal.set(Calendar.DAY\_OF\_WEEK, Calendar.MONDAY);  
                String lastWeekStart = format.format(cal.getTime())+" 00:00:00";//上周开始（即：上周一）  
                cal.clear();  
                resultString = lastWeekStart;  
                break;  
            case LAST\_WEEK\_END://上周结束  
                cal=Calendar.getInstance();  
                cal.add(Calendar.WEEK\_OF\_YEAR, 0);  
                cal.set(Calendar.DAY\_OF\_WEEK, Calendar.SUNDAY);  
                String lastWeekEnd = format.format(cal.getTime())+" 23:59:59";//上周结束（即：上周日）  
                cal.clear();  
                resultString = lastWeekEnd;  
                break;  
            case THIS\_WEEK\_START://本周开始  
                cal=Calendar.getInstance();  
                cal.add(Calendar.WEEK\_OF\_YEAR, 0);  
                cal.set(Calendar.DAY\_OF\_WEEK, Calendar.MONDAY);  
                String thisWeekStart = format.format(cal.getTime())+" 00:00:00";//本周开始（即：本周一）  
                cal.clear();  
                resultString = thisWeekStart;  
                break;  
            case THIS\_WEEK\_END://本周结束  
                String thisWeekEnd = now;//本周结束(即：当前时间)  
                resultString = thisWeekEnd;  
                break;  
            case YESTERDAY\_START://昨天开始  
                cal = Calendar.getInstance();  
                cal.add(Calendar.DAY\_OF\_MONTH, -1);  
                format = new java.text.SimpleDateFormat("yyyy-MM-dd");  
                String yesterdayStart= format.format(cal.getTime());  
                yesterdayStart = yesterdayStart+" 00:00:00";//昨天开始  
                cal.clear();  
                resultString = yesterdayStart;  
                break;  
            case YESTERDAY\_END://昨天结束  
                cal = Calendar.getInstance();  
                cal.add(Calendar.DAY\_OF\_MONTH, -1);  
                format = new java.text.SimpleDateFormat("yyyy-MM-dd");  
                String yesterdayEnd= format.format(cal.getTime());  
                yesterdayEnd = yesterdayEnd+" 23:59:59";//昨天结束  
                cal.clear();  
                resultString = yesterdayEnd;  
                break;  
            case TODAY\_START://今天开始  
                String todayStart=format.format(date)+" 00:00:00";//今天开始  
                resultString = todayStart;  
                break;  
            case TODAY\_END://今天结束  
                String todayEnd = now;//今天结束（即；当前时间）  
                resultString = todayEnd;  
                break;  
            default://没有匹配的，返回当前时间  
                resultString = now;  
             
        \}  
        return resultString;