jdk1.8 date新特性

package com.journaldev.java8.time;

import java.time.LocalDate;
import java.time.Month;
import java.time.ZoneId;

public class LocalDateExample {

public static void main(String[] args) {
日期
//Current Date
LocalDate today = LocalDate.now();
System.out.println("Current Date="+today);

//Creating LocalDate by providing input arguments
LocalDate firstDay_2014 = LocalDate.of(2014, Month.JANUARY, 1);
System.out.println("Specific Date="+firstDay_2014);

//Try creating date by providing invalid inputs
//LocalDate feb29_2014 = LocalDate.of(2014, Month.FEBRUARY, 29);
//Exception in thread "main" java.time.DateTimeException:
//Invalid date 'February 29' as '2014' is not a leap year

//Current date in "Asia/Kolkata", you can get it from ZoneId javadoc
LocalDate todayKolkata = LocalDate.now(ZoneId.of("Asia/Kolkata"));
System.out.println("Current Date in IST="+todayKolkata);

//java.time.zone.ZoneRulesException: Unknown time-zone ID: IST
//LocalDate todayIST = LocalDate.now(ZoneId.of("IST"));

//Getting date from the base date i.e 01/01/1970
LocalDate dateFromBase = LocalDate.ofEpochDay(365);
System.out.println("365th day from base date= "+dateFromBase);

LocalDate hundredDay2014 = LocalDate.ofYearDay(2014, 100);
System.out.println("100th day of 2014="+hundredDay2014);
}

时间

        //Current Time

        LocalTime time = LocalTime.now();

        System.out.println("Current Time="+time);

 

        //Creating LocalTime by providing input arguments

        LocalTime specificTime = LocalTime.of(12,20,25,40);

        System.out.println("Specific Time of Day="+specificTime);

 

        //Try creating time by providing invalid inputs

        //LocalTime invalidTime = LocalTime.of(25,20);

        //Exception in thread "main" java.time.DateTimeException:

        //Invalid value for HourOfDay (valid values 0 - 23): 25

 

        //Current date in "Asia/Kolkata", you can get it from ZoneId javadoc

        LocalTime timeKolkata = LocalTime.now(ZoneId.of("Asia/Kolkata"));

        System.out.println("Current Time in IST="+timeKolkata);

 

        //java.time.zone.ZoneRulesException: Unknown time-zone ID: IST

        //LocalTime todayIST = LocalTime.now(ZoneId.of("IST"));

 

        //Getting date from the base date i.e 01/01/1970

        LocalTime specificSecondTime = LocalTime.ofSecondOfDay(10000);

        System.out.println("10000th second time= "+specificSecondTime);

日期时间//Current Date
LocalDateTime today = LocalDateTime.now();
System.out.println("Current DateTime="+today);

//Current Date using LocalDate and LocalTime
today = LocalDateTime.of(LocalDate.now(), LocalTime.now());
System.out.println("Current DateTime="+today);

//Creating LocalDateTime by providing input arguments
LocalDateTime specificDate = LocalDateTime.of(2014, Month.JANUARY, 1, 10, 10, 30);
System.out.println("Specific Date="+specificDate);

//Try creating date by providing invalid inputs
//LocalDateTime feb29_2014 = LocalDateTime.of(2014, Month.FEBRUARY, 28, 25,1,1);
//Exception in thread "main" java.time.DateTimeException:
//Invalid value for HourOfDay (valid values 0 - 23): 25

//Current date in "Asia/Kolkata", you can get it from ZoneId javadoc
LocalDateTime todayKolkata = LocalDateTime.now(ZoneId.of("Asia/Kolkata"));
System.out.println("Current Date in IST="+todayKolkata);

//java.time.zone.ZoneRulesException: Unknown time-zone ID: IST
//LocalDateTime todayIST = LocalDateTime.now(ZoneId.of("IST"));

//Getting date from the base date i.e 01/01/1970
LocalDateTime dateFromBase = LocalDateTime.ofEpochSecond(10000, 0, ZoneOffset.UTC);
System.out.println("10000th second time from 01/01/1970= "+dateFromBase);

}

        //Current Time

        LocalTime time = LocalTime.now();

        System.out.println("Current Time="+time);

 

        //Creating LocalTime by providing input arguments

        LocalTime specificTime = LocalTime.of(12,20,25,40);

        System.out.println("Specific Time of Day="+specificTime);

 

        //Try creating time by providing invalid inputs

        //LocalTime invalidTime = LocalTime.of(25,20);

        //Exception in thread "main" java.time.DateTimeException:

        //Invalid value for HourOfDay (valid values 0 - 23): 25

 

        //Current date in "Asia/Kolkata", you can get it from ZoneId javadoc

        LocalTime timeKolkata = LocalTime.now(ZoneId.of("Asia/Kolkata"));

        System.out.println("Current Time in IST="+timeKolkata);

 

        //java.time.zone.ZoneRulesException: Unknown time-zone ID: IST

        //LocalTime todayIST = LocalTime.now(ZoneId.of("IST"));

 

        //Getting date from the base date i.e 01/01/1970

        LocalTime specificSecondTime = LocalTime.ofSecondOfDay(10000);

        System.out.println("10000th second time= "+specificSecondTime);