In this article, we will learn how to convert ZonedDateTime to GregorianCalendar in Java 1.8 version and vice-versa
ZonedDateTime to GregorianCalendar conversion & vice-versa :
- There are 3 new methods introduced in Java 1.8 version for GregorianCalendar class, those are
- from(ZonedDateTime) – This static method obtains an instance of
GregorianCalendar
with the default locale from aZonedDateTime
object - toZonedDateTime() – This method converts invoking GregorianCalendar object to a
ZonedDateTime
that represents the same point on the time-line as that ofGregorianCalendar
object - getCalendarType() – Returns
"gregory"
as the calendar type
- from(ZonedDateTime) – This static method obtains an instance of
1. Convert ZonedDateTime to GregorianCalendar :
- GregorianCalendar.from() method accepts ZonedDateTime as input-argument and returns GregorianCalendar
- Converted GregorianCalendar will have,
- Date & Time & Zone parts remain same as that of ZonedDateTime
- In short, ZonedDateTime -> GregorianCalendar
- Lets see an example for conversion of ZonedDateTime to GregorianCalendar in the below illustration
ConvertZonedDateTimeToGregorianCalendar.java
package in.bench.resources.java8.zoneddatetime.examples;
import java.time.ZonedDateTime;
import java.time.ZoneId;
import java.util.GregorianCalendar;
public class ConvertZonedDateTimeToGregorianCalendar {
public static void main(String[] args) {
// 1. get Zoned Date/time
ZonedDateTime zonedDateTime = ZonedDateTime.now();
System.out.println("Zoned Date/time is :- \n"
+ zonedDateTime);
// 2. get system default zone
ZoneId zoneId = ZoneId.systemDefault();
System.out.println("\nDefault System Zone is :- \n"
+ zoneId);
// 3. convert ZonedDateTime -> GregorianCalendar
GregorianCalendar gregorianCalendar = GregorianCalendar
.from(zonedDateTime);
// 4. print to console
System.out.print("\nConversion of ZonedDateTime to GregorianCalendar is :- \n"
+ gregorianCalendar.getTime());
}
}
Output:
Zoned Date/time is :-
2022-08-13T17:15:46.983373200+05:30[Asia/Calcutta]
Default System Zone is :-
Asia/Calcutta
Conversion of ZonedDateTime to GregorianCalendar is :-
Sat Aug 13 17:15:46 IST 2022
2. Convert GregorianCalendar to ZonedDateTime :
- Instantiate GregorianCalendar object for conversion to ZonedDateTime
- Convert GregorianCalendar to ZonedDateTime using toZonedDateTime() method
- In short, GregorianCalendar -> ZonedDateTime
- Lets see an example for conversion of GregorianCalendar to ZonedDateTime in the below illustration
ConvertGregorianCalendarToZonedDateTime.java
package in.bench.resources.java8.zoneddatetime.examples;
import java.time.ZonedDateTime;
import java.time.ZoneId;
import java.util.GregorianCalendar;
public class ConvertGregorianCalendarToZonedDateTime {
public static void main(String[] args) {
// 1. Instantiate GregorianCalendar
GregorianCalendar gregorianCalendar = new GregorianCalendar();
System.out.println("Current Date/Time is :- \n"
+ gregorianCalendar.getTime());
// 2. get system default zone
ZoneId zoneId = ZoneId.systemDefault();
System.out.println("\nDefault System Zone is :- \n"
+ zoneId);
// 3. convert GregorianCalendar -> ZonedDateTime
ZonedDateTime zonedDateTime = gregorianCalendar.toZonedDateTime();
// 4. print to console
System.out.print("\nConversion of GregorianCalendar to ZonedDateTime is :- \n"
+ zonedDateTime);
}
}
Output:
Current Date/Time is :-
Sat Aug 13 17:16:01 IST 2022
Default System Zone is :-
Asia/Calcutta
Conversion of GregorianCalendar to ZonedDateTime is :-
2022-08-13T17:16:01.906+05:30[Asia/Calcutta]
Related Articles:
- Java 8 – ZonedDateTime with method details and examples
- Java 8 – How to get Date, Time and Zone fields from ZonedDateTime ?
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- Java 8 – How to convert ZonedDateTime to Calendar and vice-versa ?
- Java 8 – How to convert ZonedDateTime to GregorianCalendar and vice-versa ?
- Java 8 – How to convert ZonedDateTime to XMLGregorianCalendar and vice-versa ?
- Java 8 – How to convert java.util.Date to ZonedDateTime in different ways ?
- Java 8 – How to add Date and Time fields to ZonedDateTime ?
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- Java 8 – How to check whether a ZonedDateTime is Before another ZonedDateTime ?
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- More Java 8 Date/Time API examples
References:
- https://docs.oracle.com/javase/8/docs/api/java/time/LocalDateTime.html
- https://docs.oracle.com/javase/8/docs/api/java/time/Instant.html
- https://docs.oracle.com/javase/8/docs/api/java/time/ZonedDateTime.html
- https://docs.oracle.com/javase/8/docs/api/java/time/ZoneId.html
- https://docs.oracle.com/javase/7/docs/api/java/util/GregorianCalendar.html
- https://docs.oracle.com/javase/8/docs/api/java/util/Date.html
- https://docs.oracle.com/javase/8/docs/api/java/util/Calendar.html
- https://docs.oracle.com/javase/8/docs/api/java/sql/Timestamp.html
Happy Coding !!
Happy Learning !!