关于对日期操作得综合类

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/*====================================================
*功能：完成字符串转换成ORACLE日期数据格式的功能
*作者：陈庆余
*完成日期：2004年05月13日
*版本：V1.0
*===================================================*/
package com.unit.DateConversion;
import java.util.Calendar;
import com.unit.ValidateNum.*;

public class DateConversion {
ValidateNum VN = new ValidateNum();
//输入的是三个字符串分别是：年、月、日
public java.sql.Date DateConversion(String DateStr_Year,String DateStr_Month,String DateStr_Day) {
  int Date_Year;
  int Date_Month;
  int Date_Day;
  Date_Year = VN.StrToNum(DateStr_Year);
  Date_Month = VN.StrToNum(DateStr_Month);
  Date_Day = VN.StrToNum(DateStr_Day);
  Calendar cal = Calendar.getInstance();
  cal.clear();
  cal.set(Date_Year,Date_Month,Date_Day);
         java.util.Date UtilDate = cal.getTime();
         long NowTime = UtilDate.getTime();
  java.sql.Date NowDate = new java.sql.Date(NowTime);
  return NowDate;
}
//输入的是一个字符串，其值是年月日的叠加(如：20050515）
public java.sql.Date DateConversion(String DateStr) {
  int Date_Year;
  int Date_Month;
  int Date_Day;
  Date_Year = VN.StrToNum(DateStr.substring(0,4));
  Date_Month = VN.StrToNum(DateStr.substring(4,6));
  Date_Day = VN.StrToNum(DateStr.substring(6,8));
  Calendar cal = Calendar.getInstance();
  cal.clear();
  cal.set(Date_Year,Date_Month-1,Date_Day);
  java.util.Date UtilDate = cal.getTime();
  long NowTime = UtilDate.getTime();
  java.sql.Date NowDate = new java.sql.Date(NowTime);
  return NowDate;
}
//输入的是一个字符串，其值是年月日的叠加(如：2005-05-15）
public java.sql.Date DateConversionA(String DateStr) {
  int Date_Year;
  int Date_Month;
  int Date_Day;
  Date_Year = VN.StrToNum(DateStr.substring(0,4));
  Date_Month = VN.StrToNum(DateStr.substring(5,7));
  Date_Day = VN.StrToNum(DateStr.substring(8,10));
  Calendar cal = Calendar.getInstance();
  cal.clear();
  cal.set(Date_Year,Date_Month-1,Date_Day);
  java.util.Date UtilDate = cal.getTime();
  long NowTime = UtilDate.getTime();
  java.sql.Date NowDate = new java.sql.Date(NowTime);
  return NowDate;
}
//获得当日的日期（服务器）
public java.sql.Date NowDate() {
  Calendar cal = Calendar.getInstance();
  java.util.Date UtilDate = cal.getTime();
  long NowTime = UtilDate.getTime();
  java.sql.Date NowDate = new java.sql.Date(NowTime);
  return NowDate;
}
//获得上一个月的第一天
public java.sql.Date getFrontMixDay() {
Calendar cal = Calendar.getInstance();
  int MixDayTodayMonth = 1;
  int NowYear = cal.get(cal.YEAR);
  int NowMonth = cal.get(cal.MONTH)-1;
  cal.clear();
  cal.set(NowYear,NowMonth,MixDayTodayMonth);
  java.util.Date UtilDate = cal.getTime();
  long NowMaxTime = UtilDate.getTime();
  java.sql.Date NowMaxDate = new java.sql.Date(NowMaxTime);
  return NowMaxDate;
}

//获得上一个月的最大日期[最后一天]
public java.sql.Date getFrontMaxDay() {
Calendar cal = Calendar.getInstance();
  int MaxDayTodayMonth = cal.getActualMaximum(cal.DAY_OF_MONTH);
  int NowYear = cal.get(cal.YEAR);
  int NowMonth = cal.get(cal.MONTH)-1;
  cal.clear();
  cal.set(NowYear,NowMonth,MaxDayTodayMonth);
  java.util.Date UtilDate = cal.getTime();
  long NowMaxTime = UtilDate.getTime();
  java.sql.Date NowMaxDate = new java.sql.Date(NowMaxTime);
  return NowMaxDate;
}

//获得当月最大日期（服务器)
public java.sql.Date MaxDateNowMonth() {
  Calendar cal = Calendar.getInstance();
  int MaxDayTodayMonth = cal.getActualMaximum(cal.DAY_OF_MONTH);
  int NowYear = cal.get(cal.YEAR);
  int NowMonth = cal.get(cal.MONTH);
  cal.clear();
  cal.set(NowYear,NowMonth,MaxDayTodayMonth);
  java.util.Date UtilDate = cal.getTime();
  long NowMaxTime = UtilDate.getTime();
  java.sql.Date NowMaxDate = new java.sql.Date(NowMaxTime);
  return NowMaxDate;
}
//获得当月最小日期（服务器）
public java.sql.Date MixDateNowMonth() {
  Calendar cal = Calendar.getInstance();
  int MixDayTodayMonth = 1;
  int NowYear = cal.get(cal.YEAR);
  int NowMonth = cal.get(cal.MONTH);
  cal.clear();
  cal.set(NowYear,NowMonth,MixDayTodayMonth);
  java.util.Date UtilDate = cal.getTime();
  long NowMixTime = UtilDate.getTime();
  java.sql.Date NowMixDate = new java.sql.Date(NowMixTime);
  return NowMixDate;
}
//获得当年的最大日期
public java.sql.Date MaxDateNowYear() {
  Calendar cal = Calendar.getInstance();
  int MaxDayNowYear = 1;
  int NowYear = cal.get(cal.YEAR);
  int MaxMonthNowYear = 12;
  cal.clear();
  cal.set(NowYear,MaxMonthNowYear-1,MaxDayNowYear);
  MaxDayNowYear = cal.getActualMaximum(cal.DAY_OF_MONTH);
  cal.clear();
  cal.set(NowYear,MaxMonthNowYear-1,MaxDayNowYear);

  java.util.Date UtilDate = cal.getTime();
  long NowMaxTime = UtilDate.getTime();
  java.sql.Date NowMaxDate = new java.sql.Date(NowMaxTime);
  return NowMaxDate;
}
//获得当年的最小日期（服务器）
public java.sql.Date MixDateNowYear() {
  Calendar cal = Calendar.getInstance();
  int MixDayNowYear = 1;
  int NowYear = cal.get(cal.YEAR);
  int MixMonthNowYear = 0;
  cal.clear();
  cal.set(NowYear,MixMonthNowYear,MixDayNowYear);
  java.util.Date UtilDate = cal.getTime();
  long NowMixTime = UtilDate.getTime();
  java.sql.Date NowMixDate = new java.sql.Date(NowMixTime);
  return NowMixDate;
}

}