Date and Time

package my_proj;
import java.time.LocalDate; 

public class my_first {
public static void main(String[] args) {

 LocalDate my_date = LocalDate.now(); // date object is created
 System.out.println(my_date); // 2020-02-14	

}
}

Different Date and time Classes we will use

LocalDate : Class representing Date ( yyyy-MM-dd)
LocalTime : Class representing Time ( HH-mm-ss-zzz )
LocalDateTime : Class representing Date and time (yyyy-MM-dd-HH-mm-ss.zzz)
DateTimeFormatter : Formatter for displaying date and time

Displaying present time

package my_proj;
import java.time.LocalTime; 

public class my_first {
public static void main(String[] args) {

 LocalTime my_time = LocalTime.now(); // time object is created
 System.out.println(my_time); // 08:59:47.991582400	

}
}

Both date and time

package my_proj;
import java.time.LocalDateTime; 

public class my_first {
public static void main(String[] args) {
	
LocalDateTime my_date_time = LocalDateTime.now(); // object 
System.out.println(my_date_time); // 2020-02-15T09:11:33.331329600
}
}

Using DateTimeFormatter

package my_proj;
import java.time.LocalDateTime; 
import java.time.format.DateTimeFormatter;
public class my_first {
public static void main(String[] args) {

 LocalDateTime my_date_time = LocalDateTime.now(); 
 System.out.println(my_date_time);//2020-02-29T12:01:45.949632100	

DateTimeFormatter my_format = DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm:ss");

String my_out_date = my_date_time.format(my_format);
System.out.println("With Formatting: " + my_out_date);//With Formatting: 29-02-2020 11:13:23
//With Formatting: 29-02-2020 12:01:45 
}
}
Ouput is here again.
2020-02-29T12:01:45.949632100
With Formatting: 29-02-2020 12:01:45

Using Calendar

package my_proj;
import java.util.Calendar; 
public class my_first {
public static void main(String[] args) {
    
Calendar my_cal = Calendar.getInstance();// created calendar 

System.out.println("Today's date is :" + my_cal.getTime());

// create date object using year,month and day
my_cal.set(2020, 0, 25);

// print the result
System.out.println("New Date & time is :" + my_cal.getTime());

}
}
Output is here
Today's date is :Sat Feb 29 15:00:21 IST 2020
New Date & time is :Sat Jan 25 15:00:21 IST 2020
We have created date object by using Year, month and date. Note that January month is considered by using 0. Similarly Feb is 1 , March is 2 ...

Methods
add()Adding to calendar fields like day, month , year , Hour etc
after()Comparison of two dates, returns true or false
before()Comparison of two dates, returns true or false
compareTo()Comparison of two dates, returns -1, 0 or 1
clear()Reset the field values to undefined
clone()Clone of one object
get()Collect different field values
getTimeInMillis()UTC milliseconds from the epoch
getDisplayName()field name in string using style nad local
getActualMaiximum()Maximum field value possible for the given Calendar object
getLeastMaiximum()The least Maximum field value possible for the given Calendar object
getActualMinimum()The actual Minimum field value possible for the given Calendar object
getFirstDayOfWeek()Read first day of week of the calendar
getGreatestMinimum()The highest Minimum field value possible for the given Calendar object
getWeeksInWeekYear()Number of weeks in a week year of Calendar object
equals()Comparison of two dates
isSet()Checking date field values if set or not
isLenient()Checking interpretation mode Lenient or not
set()Assign values to fileds
setLenient()Update status of interpretation mode Lenient
setFirstDayOfWeek()Update the first day of week of the calendar
setTimeInMillis()Setting time in UTC milliseconds from the epoch
toString()Calendar to String object
Java Tutorials



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