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获取昨天的日期字符串

import java.text.SimpleDateFormat;
import java.util.Date;

public class Test
{

    /**
     * 获取昨天的日期字符串
     * 
     * @param nowDate
     *            当前日期的字符串
     * @return
     */
    public static String getLastDayInfo(String nowDate)
    {
        String yesterday = "";
        int year = 0;
        int month = 0;
        int day = 0;
        try
        {
            year = Integer.parseInt(nowDate.substring(0, nowDate.indexOf("-")));
            month = Integer.parseInt(nowDate.substring(
                    nowDate.indexOf("-") + 1, nowDate.lastIndexOf("-")));
            day = Integer.parseInt(nowDate
                    .substring(nowDate.lastIndexOf("-") + 1));
            // System.out.println("nowYear = " + year);
            // System.out.println("nowMonth = " + month);
            // System.out.println("dayDay = " + day);
            day = day - 1;
            if (day == 0)
            {
                month = month - 1;
                if (month == 0)
                {
                    // January
                    month = 12;
                    day = 31;
                    year = year - 1;
                }
                else
                {
                    // not Jan.
                    switch (month)
                    {
                    // 1|3|5|7|8|10|12) day=31;;
                    case 1:
                        day = 31;
                        break;
                    case 3:
                        day = 31;
                        break;
                    case 5:
                        day = 31;
                        break;
                    case 7:
                        day = 31;
                        break;
                    case 8:
                        day = 31;
                        break;
                    case 10:
                        day = 31;
                        break;
                    case 12:
                        day = 31;
                        break;
                    // 4|6|9|11) day=30;;
                    case 4:
                        day = 30;
                        break;
                    case 6:
                        day = 30;
                        break;
                    case 9:
                        day = 30;
                        break;
                    case 11:
                        day = 30;
                        break;
                    case 2:
                        if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
                        {
                            // leap year
                            day = 29;
                        }
                        else
                            day = 28;

                    }

                }
            }

            String monthStr = "";
            String dayStr = "";

            if (month < 10)
            {
                monthStr = "0" + String.valueOf(month);
            }
            else
            {
                monthStr = String.valueOf(month);
            }

            if (day < 10)
            {
                dayStr = "0" + String.valueOf(day);
            }
            else
            {
                dayStr = String.valueOf(day);
            }
            yesterday = String.valueOf(year) + "-" + monthStr + "-" + dayStr;
        } catch (Exception e)
        {
            e.printStackTrace();
        }
        return yesterday;
    }

    public static void main(String[] args) throws Exception
    {
        System.out.println(getLastDayInfo("2008-03-01"));
        System.out.println(getLastDayInfo("2008-01-01"));
        SimpleDateFormat sdf = new SimpleDateFormat("MMMM-dd-yyyy");
        Date date;
        String datetime = "02-14-1984";
        try
        {
            date = sdf.parse(datetime);

            System.out.println(sdf.format(date));
        } catch (Exception e)
        {
            System.out.println(e.getMessage());
        }
        Date d = java.sql.Date.valueOf("2008-07-06");
        System.out.println(d.toString());
    }

}

posted on 2008-07-11 10:19 々上善若水々 阅读(85) 评论(0)  编辑  收藏 所属分类: J2SE


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