Java 将GregorianCalendar转换为新的Datetime类型，反之亦然

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import java.time.LocalDate;

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import java.time.LocalDateTime;

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import java.time.LocalTime;

/*

nowjava

*/

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import java.time.OffsetDateTime;

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import java.time.OffsetTime;

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import java.time.ZoneId;

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import java.time.ZonedDateTime;

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import java.util.GregorianCalendar;

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import java.util.TimeZone;

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public class Main {

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  public static void main(String[] args) {

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    // Create a GC for the default time zone

    /** from 

    时 代 J a v a - nowjava.com**/

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    GregorianCalendar gc = new GregorianCalendar(2017, 1, 11, 15, 45, 50);

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    System.out.println("Gregorian Calendar: " + gc.getTime());

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    // Convert the GC to a LocalDate

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    LocalDate ld = gc.toZonedDateTime().toLocalDate();

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    System.out.println("Local Date: " + ld);

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    // Convert the GC to a LocalTime

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    LocalTime lt = gc.toZonedDateTime().toLocalTime();

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    System.out.println("Local Time: " + lt);

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    // Convert the GC to a LocalDateTime

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    LocalDateTime ldt = gc.toZonedDateTime().toLocalDateTime();

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    System.out.println("Local DateTime: " + ldt);

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    // Convert the GC to an OffsetDate

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    OffsetDateTime od = gc.toZonedDateTime().toOffsetDateTime();

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    System.out.println("Offset Date: " + od);

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    // Convert the GC to an OffsetTime

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    OffsetTime ot = gc.toZonedDateTime().toOffsetDateTime().toOffsetTime();

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    System.out.println("Offset Time: " + ot);

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    // Convert the GC to an ZonedDateTime

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    ZonedDateTime zdt = gc.toZonedDateTime();

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    System.out.println("Zoned DateTime: " + zdt);

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    // Convert the ZonedDateTime to a GC. In GC month starts at 0

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    // and in new API at 1

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    ZoneId zoneId = zdt.getZone();

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