In this post we’ll see Java programs to convert java.time.Instant to LocalDate, LocalTime and LocalDateTime.
1. An Instant provides an instantaneous point of time in UTC (Coordinated Universal Time) so converting it to LocalDate, LocalDateTime involves converting instant to-
- ZonedDateTime by specifying the ZoneID used.
- OffsetDateTime by specifying the ZoneOffset used.
Once you have an instance of ZonedDateTime or OffsetDateTime you can get LocalDate, LocalTime or LocalDateTime by using methods toLocalDate(), toLocalTime(), toLocalDateTime() respectively.
2. Another way is to use ofInstant() static method in LocalDate, LocalTime, LocalDateTime classes for conversion.
Instant to LocalDate, LocalDateTime using ZonedDateTime
public class InsantExample {
public static void main(String[] args) {
Instant instant = Instant.parse("2019-10-20T02:35:15.245Z");
System.out.println("Instant- " + instant);
// Getting ZonedDateTime
ZonedDateTime zdt = instant.atZone(ZoneId.of("Europe/Paris"));
System.out.println("ZonedDateTime- " + zdt);
// Getting LocalDate
System.out.println("LocalDate- " + zdt.toLocalDate());
System.out.println("LocalTime- " + zdt.toLocalTime());
System.out.println("LocalDateTime- " + zdt.toLocalDateTime());
}
}
Output
Instant- 2019-10-20T02:35:15.245Z ZonedDateTime- 2019-10-20T04:35:15.245+02:00[Europe/Paris] LocalDate- 2019-10-20 LocalTime- 04:35:15.245 LocalDateTime- 2019-10-20T04:35:15.245
Instant to LocalTime, LocalDateTime using OffsetDateTime
public class InsantExample {
public static void main(String[] args) {
Instant instant = Instant.parse("2019-10-20T02:35:15.245Z");
System.out.println("Instant- " + instant);
// Getting OffsetDateTime by specifying offset
OffsetDateTime odt = instant.atOffset(ZoneOffset.of("+02:00"));
System.out.println("OffsetDateTime- " + odt);
// Getting LocalDate
System.out.println("LocalDate- " + odt.toLocalDate());
System.out.println("LocalTime- " + odt.toLocalTime());
System.out.println("LocalDateTime- " + odt.toLocalDateTime());
}
}
Output
Instant- 2019-10-20T02:35:15.245Z OffsetDateTime- 2019-10-20T04:35:15.245+02:00 LocalDate- 2019-10-20 LocalTime- 04:35:15.245 LocalDateTime- 2019-10-20T04:35:15.245
Using ofInstant() method
For LocalDate
Instant instant = Instant.parse("2019-10-20T02:35:15.245Z");
System.out.println("Instant- " + instant);
LocalDate ld = LocalDate.ofInstant(instant, ZoneId.of("Asia/Kolkata"));
System.out.println("LocalDate- " + ld);
Output
Instant- 2019-10-20T02:35:15.245Z LocalDate- 2019-10-20
For LocalTime
Instant instant = Instant.parse("2019-10-20T02:35:15.245Z");
System.out.println("Instant- " + instant);
LocalTime lt = LocalTime.ofInstant(instant, ZoneId.of("Asia/Kolkata"));
System.out.println("LocalTime- " + lt);
Output
Instant- 2019-10-20T02:35:15.245Z LocalTime- 08:05:15.245
For LocalDateTime
Instant instant = Instant.parse("2019-10-20T02:35:15.245Z");
System.out.println("Instant- " + instant);
LocalDateTime ldt = LocalDateTime.ofInstant(instant, ZoneId.of("Asia/Kolkata"));
System.out.println("LocalDateTime- " + ldt);
Output
Instant- 2019-10-20T02:35:15.245Z LocalDateTime- 2019-10-20T08:05:15.245
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