时间日期工具类
时间日期工具类
package tools;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;/* * public static Date getCurrentDate() //取得系统当前时间 * public String getFdate(Date date,String style) //根据指定格式将输出时间 * public String getNowTime(String dateformat) //获取当天时间并按指定格式输出 * public String getNowTime() //取得系统当前时间并按yyyy-MM-dd格式化输出 * public String getYear() //取得系统当前时间的年并按yyyy格式化输出 * public String getYMonth() //取得系统当前时间的年月并按yyyy-MM格式化输出 * public String dateToString(Date date) //将date类型转换为String类型 * public Date stringToDate(String str) //将String类型转换为日期类型 * *//*public class DateUtils {private Date date = null;private int yy; // 保存由Date类中getYear()方法返回的整型数值private int mm; // 保存由Date类中getMonth()方法返回的整型数值private int dd; // 保存由Date类中getDate()方法返回的整型数值private String sy;private String sm;private String sd;public DateUtils() {date = new Date();yy = date.getYear() + 1900; // 只有加上1900才是系统当前的年份mm = date.getMonth() + 1; // 只有加上1才是系统当前的月份dd = date.getDate();sy = String.valueOf(yy); // 将整型yy转化为字符串类型sm = String.valueOf(mm); // 将整型mm转化为字符串类型sd = String.valueOf(dd); // 将整型dd转化为字符串类型// 如果月份是1位数在前面加上"0"，即如果是1月份那么显示的就是"01"if (sm.length() == 1) {sm = "0" + sm;}if (sd.length() == 1) {sd = "0" + sd;}}public String getDateString() {return sy + sm + sd;}public String getDate() {return sy + "-" + sm + "-" + sd;}}*///===========================================================================public class DateUtils {//取得系统当前时间public static Date getCurrentDate() {return new Date();}//根据指定格式将输出时间public static String getFdate(Date date,String style){SimpleDateFormat dFormat=new SimpleDateFormat(style);if(date==null)return null;String datetime=dFormat.format(date);return datetime;}//获取当天时间并按指定格式输出 public static String getNowTime(String dateformat){ Date now = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat(dateformat);//可以方便地修改日期格式 String formatNow = dateFormat.format(now); return formatNow; } //取得系统当前时间并按yyyy-MM-dd格式化输出，public static String getNowTime(){SimpleDateFormat dFormat=new SimpleDateFormat("yyyy-MM-dd");String datetime=dFormat.format(getCurrentDate());return datetime;}//取得系统当前时间的年并按yyyy格式化输出，public static String getYear(){Date date=new Date();SimpleDateFormat dFormat=new SimpleDateFormat("yyyy");String dateYear=dFormat.format(date);return dateYear;}//取得系统当前时间的年月并按yyyy-MM格式化输出，public static String getYMonth(){Date date=new Date();SimpleDateFormat dFormat=new SimpleDateFormat("yyyy-MM");String dateYM=dFormat.format(date);return dateYM;}//将date类型转换为String类型public static String dateToString(Date date){String dateStr="";if(date!=null){SimpleDateFormat sf=new SimpleDateFormat("yyyy-MM-dd");dateStr=sf.format(date);}return dateStr;}//将String类型转换为日期类型public static Date stringToDate(String str,String style){SimpleDateFormat sdf=new SimpleDateFormat();sdf.applyPattern(style);Date date=null;if(str==null||str.length()<8)return null;try{date=sdf.parse(str);}catch(ParseException e){e.printStackTrace();}return date;}//========================通过设置系统时间格式来显示时间==================//设置所要取得的格式,需要时在这里设置格式即可private static final String StandardYear = "yyyy/MM/dd";//根据Private提供的StandarYear返回所需要的格式SimpleDateFormatprivate static SimpleDateFormat getStandardYearFormat() {return getDateTimeFormat(StandardYear);}/** * @see 根据参数中定义的日期格式来转换 * @param pattern * @return SimpleDateFormat */private static SimpleDateFormat getDateTimeFormat(String pattern) {SimpleDateFormat sf = new SimpleDateFormat(pattern);return sf;}//返回系统所需时间 public static String getCurrentYear() {SimpleDateFormat sf = getStandardYearFormat();return sf.format(getCurrentDate());}//========================通过设置系统时间格式来显示时间END==================public static void main(String[] args) {DateUtils du=new DateUtils();String dt=du.getNowTime();System.out.println(dt);String dd=du.getCurrentYear();System.out.println(dd);String df=du.getFdate(new Date(),"yyyyMMdd");System.out.println(df);System.out.println("============");String dts=du.dateToString(new Date());System.out.println(dts);String s="20100101";Date d=du.stringToDate(s, "yyyyMMdd"); System.out.println(d);}}package gooo;import java.text.DateFormat; import java.text.ParsePosition; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; public class DateTools { //用来全局控制 上一周，本周，下一周的周数变化 private int weeks = 0; private int MaxDate;//一月最大天数 private int MaxYear;//一年最大天数 /** * @param args */ public static void main(String[] args) { DateTools tt = new DateTools(); System.out.println("获取当天日期:"+tt.getNowTime("yyyy-MM-dd")); System.out.println("获取本周一日期:"+tt.getMondayOFWeek()); System.out.println("获取本周日的日期~:"+tt.getCurrentWeekday()); System.out.println("获取上周一日期:"+tt.getPreviousWeekday()); System.out.println("获取上周日日期:"+tt.getPreviousWeekSunday()); System.out.println("获取下周一日期:"+tt.getNextMonday()); System.out.println("获取下周日日期:"+tt.getNextSunday()); System.out.println("获得相应周的周六的日期:"+tt.getNowTime("yyyy-MM-dd")); System.out.println("获取本月第一天日期:"+tt.getFirstDayOfMonth()); System.out.println("获取本月最后一天日期:"+tt.getDefaultDay()); System.out.println("获取上月第一天日期:"+tt.getPreviousMonthFirst()); System.out.println("获取上月最后一天的日期:"+tt.getPreviousMonthEnd()); System.out.println("获取下月第一天日期:"+tt.getNextMonthFirst()); System.out.println("获取下月最后一天日期:"+tt.getNextMonthEnd()); System.out.println("获取本年的第一天日期:"+tt.getCurrentYearFirst()); System.out.println("获取本年最后一天日期:"+tt.getCurrentYearEnd()); System.out.println("获取去年的第一天日期:"+tt.getPreviousYearFirst()); System.out.println("获取去年的最后一天日期:"+tt.getPreviousYearEnd()); System.out.println("获取明年第一天日期:"+tt.getNextYearFirst()); System.out.println("获取明年最后一天日期:"+tt.getNextYearEnd()); System.out.println("获取本季度第一天到最后一天:"+tt.getThisSeasonTime(11)); System.out.println("获取两个日期之间间隔天数2008-12-1~2008-9.29:"+DateTools.getTwoDay("2008-12-1","2008-9-29")); } /** * 得到二个日期间的间隔天数 */ public static String getTwoDay(String sj1, String sj2) { SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd"); long day = 0; try { java.util.Date date = myFormatter.parse(sj1); java.util.Date mydate = myFormatter.parse(sj2); day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000); } catch (Exception e) { return ""; } return day + ""; } /** * 根据一个日期，返回是星期几的字符串 * * @param sdate * @return */ public static String getWeek(String sdate) { // 再转换为时间 Date date = DateTools.strToDate(sdate); Calendar c = Calendar.getInstance(); c.setTime(date); // int hour=c.get(Calendar.DAY_OF_WEEK); // hour中存的就是星期几了，其范围 1~7 // 1=星期日 7=星期六，其他类推 return new SimpleDateFormat("EEEE").format(c.getTime()); } /** * 将短时间格式字符串转换为时间 yyyy-MM-dd * * @param strDate * @return */ public static Date strToDate(String strDate) { SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); ParsePosition pos = new ParsePosition(0); Date strtodate = formatter.parse(strDate, pos); return strtodate; } /** * 两个时间之间的天数 * * @param date1 * @param date2 * @return */ public static long getDays(String date1, String date2) { if (date1 == null || date1.equals("")) return 0; if (date2 == null || date2.equals("")) return 0; // 转换为标准时间 SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd"); java.util.Date date = null; java.util.Date mydate = null; try { date = myFormatter.parse(date1); mydate = myFormatter.parse(date2); } catch (Exception e) { } long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000); return day; } // 计算当月最后一天,返回字符串 public String getDefaultDay(){ String str = ""; SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.set(Calendar.DATE,1);//设为当前月的1号 lastDate.add(Calendar.MONTH,1);//加一个月，变为下月的1号 lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天 str=sdf.format(lastDate.getTime()); return str; } // 上月第一天 public String getPreviousMonthFirst(){ String str = ""; SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.set(Calendar.DATE,1);//设为当前月的1号 lastDate.add(Calendar.MONTH,-1);//减一个月，变为下月的1号 //lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天 str=sdf.format(lastDate.getTime()); return str; } //获取当月第一天 public String getFirstDayOfMonth(){ String str = ""; SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.set(Calendar.DATE,1);//设为当前月的1号 str=sdf.format(lastDate.getTime()); return str; } // 获得本周星期日的日期 public String getCurrentWeekday() { weeks = 0; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus+6); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } //获取当天时间 public String getNowTime(String dateformat){ Date now = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat(dateformat);//可以方便地修改日期格式 String hehe = dateFormat.format(now); return hehe; } // 获得当前日期与本周日相差的天数 private int getMondayPlus() { Calendar cd = Calendar.getInstance(); // 获得今天是一周的第几天，星期日是第一天，星期二是第二天...... int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK)-1; //因为按中国礼拜一作为第一天所以这里减1 if (dayOfWeek == 1) { return 0; } else { return 1 - dayOfWeek; } } //获得本周一的日期 public String getMondayOFWeek(){ weeks = 0; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } //获得相应周的周六的日期 public String getSaturday() { int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks + 6); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } // 获得上周星期日的日期 public String getPreviousWeekSunday() { weeks=0; weeks--; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus+weeks); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } // 获得上周星期一的日期 public String getPreviousWeekday() { weeks--; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } // 获得下周星期一的日期 public String getNextMonday() { weeks++; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + 7); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } // 获得下周星期日的日期 public String getNextSunday() { int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + 7+6); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } private int getMonthPlus(){ Calendar cd = Calendar.getInstance(); int monthOfNumber = cd.get(Calendar.DAY_OF_MONTH); cd.set(Calendar.DATE, 1);//把日期设置为当月第一天 cd.roll(Calendar.DATE, -1);//日期回滚一天，也就是最后一天 MaxDate=cd.get(Calendar.DATE); if(monthOfNumber == 1){ return -MaxDate; }else{ return 1-monthOfNumber; } } //获得上月最后一天的日期 public String getPreviousMonthEnd(){ String str = ""; SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.add(Calendar.MONTH,-1);//减一个月 lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天 lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天 str=sdf.format(lastDate.getTime()); return str; } //获得下个月第一天的日期 public String getNextMonthFirst(){ String str = ""; SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.add(Calendar.MONTH,1);//减一个月 lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天 str=sdf.format(lastDate.getTime()); return str; } //获得下个月最后一天的日期 public String getNextMonthEnd(){ String str = ""; SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.add(Calendar.MONTH,1);//加一个月 lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天 lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天 str=sdf.format(lastDate.getTime()); return str; } //获得明年最后一天的日期 public String getNextYearEnd(){ String str = ""; SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.add(Calendar.YEAR,1);//加一个年 lastDate.set(Calendar.DAY_OF_YEAR, 1); lastDate.roll(Calendar.DAY_OF_YEAR, -1); str=sdf.format(lastDate.getTime()); return str; } //获得明年第一天的日期 public String getNextYearFirst(){ String str = ""; SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.add(Calendar.YEAR,1);//加一个年 lastDate.set(Calendar.DAY_OF_YEAR, 1); str=sdf.format(lastDate.getTime()); return str; } //获得本年有多少天 private int getMaxYear(){ Calendar cd = Calendar.getInstance(); cd.set(Calendar.DAY_OF_YEAR,1);//把日期设为当年第一天 cd.roll(Calendar.DAY_OF_YEAR,-1);//把日期回滚一天。 int MaxYear = cd.get(Calendar.DAY_OF_YEAR); return MaxYear; } private int getYearPlus(){ Calendar cd = Calendar.getInstance(); int yearOfNumber = cd.get(Calendar.DAY_OF_YEAR);//获得当天是一年中的第几天 cd.set(Calendar.DAY_OF_YEAR,1);//把日期设为当年第一天 cd.roll(Calendar.DAY_OF_YEAR,-1);//把日期回滚一天。 int MaxYear = cd.get(Calendar.DAY_OF_YEAR); if(yearOfNumber == 1){ return -MaxYear; }else{ return 1-yearOfNumber; } } //获得本年第一天的日期 public String getCurrentYearFirst(){ int yearPlus = this.getYearPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE,yearPlus); Date yearDay = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preYearDay = df.format(yearDay); return preYearDay; } //获得本年最后一天的日期 * public String getCurrentYearEnd(){ Date date = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");//可以方便地修改日期格式 String years = dateFormat.format(date); return years+"-12-31"; } //获得上年第一天的日期 * public String getPreviousYearFirst(){ Date date = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");//可以方便地修改日期格式 String years = dateFormat.format(date); int years_value = Integer.parseInt(years); years_value--; return years_value+"-1-1"; } //获得上年最后一天的日期 public String getPreviousYearEnd(){ weeks--; int yearPlus = this.getYearPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE,yearPlus+MaxYear*weeks+(MaxYear-1)); Date yearDay = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preYearDay = df.format(yearDay); getThisSeasonTime(11); return preYearDay; } //获得本季度 public String getThisSeasonTime(int month){ int array[][] = {{1,2,3},{4,5,6},{7,8,9},{10,11,12}}; int season = 1; if(month>=1&&month<=3){ season = 1; } if(month>=4&&month<=6){ season = 2; } if(month>=7&&month<=9){ season = 3; } if(month>=10&&month<=12){ season = 4; } int start_month = array[season-1][0]; int end_month = array[season-1][2]; Date date = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");//可以方便地修改日期格式 String years = dateFormat.format(date); int years_value = Integer.parseInt(years); int start_days =1;//years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month); int end_days = getLastDayOfMonth(years_value,end_month); String seasonDate = years_value+"-"+start_month+"-"+start_days+";"+years_value+"-"+end_month+"-"+end_days; return seasonDate; } /** * 获取某年某月的最后一天 * @param year 年 * @param month 月 * @return 最后一天 */ private int getLastDayOfMonth(int year, int month) { if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) { return 31; } if (month == 4 || month == 6 || month == 9 || month == 11) { return 30; } if (month == 2) { if (isLeapYear(year)) { return 29; } else { return 28; } } return 0; } /** * 是否闰年 * @param year 年 * @return */ public boolean isLeapYear(int year) { return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0); } } package gooo;import java.text.Format;import java.text.SimpleDateFormat;import java.util.Date;public final class DateHelper {private static final String StandardDate = "yyyy-MM-dd";private static final String StandardDateTime = "yyyy-MM-dd HH:mm:ss";private static final String CompactDateTime = "yyyyMMddHHmmss";private static final String StandardYear = "yyyy";private static final String CompactDate = "yyyyMMdd";private static final String FileYearMonth = "yyyy/MM";public DateHelper() {}public static String getCurrentYear() {SimpleDateFormat sf = getStandardYearFormat();return sf.format(getCurrentDate());}public static String getCompactDate() {SimpleDateFormat sf = getCompactDateFormat();return sf.format(getCurrentDate());}public static String getFileYearMonth() {SimpleDateFormat sf = getFileYearMonthFormat();return sf.format(getCurrentDate());}public static String getCurrentStrDate() {SimpleDateFormat sf = getStandardDateStr();return sf.format(getCurrentDate());}public static String getCompactDateTime() {SimpleDateFormat sf = getCompactDateTimeFormat();return sf.format(getCurrentDate());}public static java.sql.Timestamp getCurrentTimestamp() {return new java.sql.Timestamp(System.currentTimeMillis());}/** * @see 得到格式为yyyy-MM-dd HH:mm:ss的日期 * @param Date * date * @return String */public static String getStandardDateTime(Date date) {SimpleDateFormat sf = getStandardDateTimeFormat();return sf.format(date);}public static String getStandardDate(Date date) {SimpleDateFormat sf = getStandardDateFormat();return sf.format(date);}/** * @see 得到格式为yyyy-MM-dd HH:mm:ss的日期 * @return SimpleDateFormat */private static SimpleDateFormat getStandardDateTimeFormat() {return getDateTimeFormat(StandardDateTime);}private static SimpleDateFormat getStandardYearFormat() {return getDateTimeFormat(StandardYear);}private static SimpleDateFormat getCompactDateFormat() {return getDateTimeFormat(CompactDate);}private static SimpleDateFormat getFileYearMonthFormat() {return getDateTimeFormat(FileYearMonth);}private static SimpleDateFormat getStandardDateStr() {return getDateTimeFormat(StandardDate);}private static SimpleDateFormat getStandardDateFormat() {return getDateTimeFormat(StandardDate);}private static SimpleDateFormat getCompactDateTimeFormat() {return getDateTimeFormat(CompactDateTime);}/** * @see 根据参数中定义的日期格式来转换 * @param pattern * @return SimpleDateFormat */private static SimpleDateFormat getDateTimeFormat(String pattern) {SimpleDateFormat sf = new SimpleDateFormat(pattern);return sf;}public static Date getCurrentDate() {return new Date();}public static String getDate(String str) {Format format = new SimpleDateFormat(str);return format.format(getCurrentDate());}public static void main(String[] args) {DateHelper.getCompactDate();}//public static void main(String[]args){//DateHelper.getCompactDate();//}}