日期字串格式大小比較
string str1="2015-02-08";
string str2="2015-01-08";
int res=str1.compareto(str2);
1是大於 0是等於 -1是小於
獲取某年第一天日期
calendar calendar = calendar.getinstance();
calendar.clear();
calendar.set(calendar.year, year);
date curryearfirst = calendar.gettime();
獲取某年最後一天日期
calendar calendar = calendar.getinstance();
calendar.clear();
calendar.set(calendar.year, year);
calendar.roll(calendar.day_of_year, -1);
date curryearlast = calendar.gettime();
獲取當月首日
方1:calendar c = calendar.getinstance();
c.settime(date);
c.set(calendar.day_of_month, 1);
date = c.gettime();
return date;
方2:public static final ******dateformat sdf = new ******dateformat("yyyy-mm-dd");
//獲取當前月第一天：
calendar c = calendar.getinstance();
c.add(calendar.month, 0);
c.set(calendar.day_of_month, 1);//設定為1號,當前日期既為本月第一天
string monthfirst = timeutils.sdf.format(c.gettime());
system.out.println("***************nowfirst:" + monthfirst);
獲取當月最後一天
方1//獲取當前月最後一天
calendar ca = calendar.getinstance();
ca.set(calendar.day_of_month, ca.getactualmaximum(calendar.day_of_month));
string monthlast = timeutils.sdf.format(ca.gettime());
system.out.println("***************last:" + monthlast);
localdate date = localdate.of(2014, 3, 18);// 2014-03-18
int yeat = date.getyear();// 2014
month month = date.getmonth();// march
int day = date.getdayofmonth();// 18
dayofweek dow = date.getdayofweek();// tuesday
int len = date.getlengthofmonth();// 31
boolean leap = date.isleapyear();// false
localdate date1 = localdate.of(2014, 3, 18);// 2014-03-18
localdate date2 = date1.withtear(2011);// 2011-03-18
localdate date3 = date2.withdayofmonth(25);// 2011-03-25
localdate date4 = date3.with(chronofield.month_of_tear, 9)// 2011-09-25
localdate date1 = localdate.of(2014, 3, 18);// 2014-03-18
localdate date2 = date1.plusweeks(1);// 2014-03-25
localdate date3 = date2.minusyears(3);// 2011-03-25
localdate date4 = date3.plus(6, chronounit.months);)// 2011-09-25
localdate date = localdate.now();
int year = date.get(chronofield.year);
int month = date.get(chronofield.month_of_year);
int day = date.get(chronofield.day_of_month);
增減日/月
localdate now = localdate.now();
localdate minusmonthsafter = now.minusmonths(8);//操作月
localdate minusdaysafter = now.plusdays(-233);//操作日
string strday = minusdaysafter.format(datetimeformatter.ofpattern("yyyy-mm-dd"));//格式化
獲取當月首日
localdate today = localdate.now();
localdate kssj = today.with(temporaladjusters.firstdayofmonth());
string format = kssj.format(datetimeformatter.ofpattern("yyyy-mm-dd"));
system.out.println("獲取首日--"+format);
獲取當月最後一天
localdate today1 = localdate.now();
localdate kssj1 = today1.with(temporaladjusters.lastdayofmonth());
string format1 = kssj1.format(datetimeformatter.ofpattern("yyyy-mm-dd"));
system.out.println("獲取最後日--"+format1);
localtime time = localtime.of(13, 45, 20);// 12:45:20
int hour = time.gethour();// 13
int minute = time.getminute();// 45
int second = time.getsecond();// 20
localdate date = localdate.parse("2014-03-18");
localtime time = localtime.parse("13:45:20");
// 2014-03-18t13:45:20
localdatetime dt1 = localdatetime.of(2014, month.march, 18, 13, 45, 20);
localdatetime dt2 = localdatetime.of(date, time);
localdatetime dt3 = date.attime(13, 45, 20);
localdatetime dt3 = time.atdate(date);
localdate date1 = dt1.tolocaldate();
localtime time1 = dt1.tolocaltime();
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