Java工具类DateUtils实例详解
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2024-03-31 11:43:16
本文实例为大家分享了java工具类dateutils的具体代码,供大家参考,具体内容如下
import java.text.parseexception;
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本文实例为大家分享了java工具类dateutils的具体代码,供大家参考,具体内容如下
import java.text.parseexception; import java.text.simpledateformat; import java.util.calendar; import java.util.date; /** * 描述:公共日期工具类 */ public class dateutils { public static string date_format = "yyyy-mm-dd"; public static string date_time_format = "yyyy-mm-dd hh:mm:ss"; public static string date_format_chinese = "yyyy年m月d日"; /** * 获取当前日期 * * * @return * */ public static string getcurrentdate() { string datestr = null; simpledateformat df = new simpledateformat(dateutils.date_format); datestr = df.format(new date()); return datestr; } /** * 获取当前日期时间 * * * @return * */ public static string getcurrentdatetime() { string datestr = null; simpledateformat df = new simpledateformat(dateutils.date_time_format); datestr = df.format(new date()); return datestr; } /** * 获取当前日期时间 * * * @return * */ public static string getcurrentdatetime(string dateformat) { string datestr = null; simpledateformat df = new simpledateformat(dateformat); datestr = df.format(new date()); return datestr; } public static string datetodatetime(date date) { string datestr = null; simpledateformat df = new simpledateformat(dateutils.date_time_format); datestr = df.format(date); return datestr; } /** * 将字符串日期转换为日期格式 * * * @param datestr * @return * */ public static date stringtodate(string datestr) { if(datestr ==null ||datestr.equals("")){ return null; } date date = new date(); simpledateformat df = new simpledateformat(dateutils.date_format); try { date = df.parse(datestr); } catch (parseexception e) { date=dateutils.stringtodate(datestr,"yyyymmdd"); } return date; } /** * 将字符串日期转换为日期格式 * 自定義格式 * * @param datestr * @return * */ public static date stringtodate(string datestr, string dateformat) { date date = new date(); simpledateformat df = new simpledateformat(dateformat); try { date = df.parse(datestr); } catch (parseexception e) { e.printstacktrace(); } return date; } /** * 将日期格式日期转换为字符串格式 * * * @param date * @return * */ public static string datetostring(date date) { string datestr = null; simpledateformat df = new simpledateformat(dateutils.date_format); datestr = df.format(date); return datestr; } /** * 将日期格式日期转换为字符串格式 自定義格式 * * @param date * @param dateformat * @return */ public static string datetostring(date date, string dateformat) { string datestr = null; simpledateformat df = new simpledateformat(dateformat); datestr = df.format(date); return datestr; } /** * 获取日期的day值 * * * @param date * 输入日期 * @return * */ public static int getdayofdate(date date) { int d = 0; calendar cd = calendar.getinstance(); cd.settime(date); d = cd.get(calendar.day_of_month); return d; } /** * 获取日期的month值 * * * @param date * 输入日期 * @return * */ public static int getmonthofdate(date date) { int m = 0; calendar cd = calendar.getinstance(); cd.settime(date); m = cd.get(calendar.month) + 1; return m; } /** * 获取日期的year值 * * * @param date * 输入日期 * @return * */ public static int getyearofdate(date date) { int y = 0; calendar cd = calendar.getinstance(); cd.settime(date); y = cd.get(calendar.year); return y; } /** * 获取星期几 * * * @param date * 输入日期 * @return * */ public static int getweekofdate(date date) { int wd = 0; calendar cd = calendar.getinstance(); cd.settime(date); wd = cd.get(calendar.day_of_week) - 1; return wd; } /** * 获取输入日期的当月第一天 * * * @param date * 输入日期 * @return * */ public static date getfirstdayofmonth(date date) { calendar cd = calendar.getinstance(); cd.settime(date); cd.set(calendar.day_of_month, 1); return cd.gettime(); } /** * 获得输入日期的当月最后一天 * * @param date */ public static date getlastdayofmonth(date date) { return dateutils.addday(dateutils.getfirstdayofmonth(dateutils.addmonth(date, 1)), -1); } /** * 判断是否是闰年 * * * @param date * 输入日期 * @return 是true 否false * */ public static boolean isleapyear(date date) { calendar cd = calendar.getinstance(); cd.settime(date); int year = cd.get(calendar.year); if (year % 4 == 0 && year % 100 != 0 | year % 400 == 0) { return true; } else { return false; } } /** * 根据整型数表示的年月日,生成日期类型格式 * * @param year * 年 * @param month * 月 * @param day * 日 * @return * */ public static date getdatebyymd(int year, int month, int day) { calendar cd = calendar.getinstance(); cd.set(year, month-1, day); return cd.gettime(); } /** * 获取年周期对应日 * * @param date * 输入日期 * @param iyear * 年数 負數表示之前 * @return * */ public static date getyearcycleofdate(date date, int iyear) { calendar cd = calendar.getinstance(); cd.settime(date); cd.add(calendar.year, iyear); return cd.gettime(); } /** * 获取月周期对应日 * * @param date * 输入日期 * @param i * @return * */ public static date getmonthcycleofdate(date date, int i) { calendar cd = calendar.getinstance(); cd.settime(date); cd.add(calendar.month, i); return cd.gettime(); } /** * 计算 fromdate 到 todate 相差多少年 * * @param fromdate * @param todate * @return 年数 * */ public static int getyearbyminusdate(date fromdate, date todate) { calendar df=calendar.getinstance(); df.settime(fromdate); calendar dt=calendar.getinstance(); dt.settime(todate); return dt.get(calendar.year)-df.get(calendar.year); } /** * 计算 fromdate 到 todate 相差多少个月 * * @param fromdate * @param todate * @return 月数 * */ public static int getmonthbyminusdate(date fromdate, date todate) { calendar df=calendar.getinstance(); df.settime(fromdate); calendar dt=calendar.getinstance(); dt.settime(todate); return dt.get(calendar.year)*12+dt.get(calendar.month)- (df.get(calendar.year)*12+df.get(calendar.month)); } /** * 计算 fromdate 到 todate 相差多少天 * * @param fromdate * @param todate * @return 天数 * */ public static long getdaybyminusdate(object fromdate, object todate) { date f=dateutils.chgobject(fromdate); date t=dateutils.chgobject(todate); long fd=f.gettime(); long td=t.gettime(); return (td-fd)/(24l * 60l * 60l * 1000l); } /** * 计算年龄 * * @param birthday * 生日日期 * @param calcdate * 要计算的日期点 * @return * */ public static int calcage(date birthday, date calcdate) { int cyear=dateutils.getyearofdate(calcdate); int cmonth=dateutils.getmonthofdate(calcdate); int cday=dateutils.getdayofdate(calcdate); int byear=dateutils.getyearofdate(birthday); int bmonth=dateutils.getmonthofdate(birthday); int bday=dateutils.getdayofdate(birthday); if(cmonth>bmonth||(cmonth==bmonth&&cday>bday)){ return cyear-byear; }else{ return cyear-1-byear; } } /** * 从身份证中获取出生日期 * * @param idno * 身份证号码 * @return * */ public static string getbirthdayfromidcard(string idno) { calendar cd = calendar.getinstance(); if (idno.length() == 15) { cd.set(calendar.year, integer.valueof("19" + idno.substring(6, 8)) .intvalue()); cd.set(calendar.month, integer.valueof(idno.substring(8, 10)) .intvalue() - 1); cd.set(calendar.day_of_month, integer.valueof(idno.substring(10, 12)).intvalue()); } else if (idno.length() == 18) { cd.set(calendar.year, integer.valueof(idno.substring(6, 10)) .intvalue()); cd.set(calendar.month, integer.valueof(idno.substring(10, 12)) .intvalue() - 1); cd.set(calendar.day_of_month, integer.valueof(idno.substring(12, 14)).intvalue()); } return dateutils.datetostring(cd.gettime()); } /** * 在输入日期上增加(+)或减去(-)天数 * * @param date * 输入日期 * @param imonth * 要增加或减少的天数 */ public static date addday(date date, int iday) { calendar cd = calendar.getinstance(); cd.settime(date); cd.add(calendar.day_of_month, iday); return cd.gettime(); } /** * 在输入日期上增加(+)或减去(-)月份 * * @param date * 输入日期 * @param imonth * 要增加或减少的月分数 */ public static date addmonth(date date, int imonth) { calendar cd = calendar.getinstance(); cd.settime(date); cd.add(calendar.month, imonth); return cd.gettime(); } /** * 在输入日期上增加(+)或减去(-)年份 * * @param date * 输入日期 * @param imonth * 要增加或减少的年数 */ public static date addyear(date date, int iyear) { calendar cd = calendar.getinstance(); cd.settime(date); cd.add(calendar.year, iyear); return cd.gettime(); } /** * 將object類型轉換為date * @param date * @return */ public static date chgobject(object date){ if(date!=null&&date instanceof date){ return (date)date; } if(date!=null&&date instanceof string){ return dateutils.stringtodate((string)date); } return null; } public static long getagebybirthday(string date){ date birthday = stringtodate(date, "yyyy-mm-dd"); long sec = new date().gettime() - birthday.gettime(); long age = sec/(1000*60*60*24)/365; return age; } /** * @param args */ public static void main(string[] args) { //string temp = dateutil.datetostring(getlastdayofmonth(new date()), /// dateutil.date_format_chinese); //string s=dateutil.datetostring(dateutil.addday(dateutil.addyear(new date(),1),-1)); long s=dateutils.getdaybyminusdate("2012-01-01", "2012-12-31"); system.err.println(s); } }
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