Java Date和DateTime相互转换

java.util.Date和java.time.DateTime的桥梁。

import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;

public class DateTimeUtil {

    private static final ZoneId systemDefaultZone = ZoneId.systemDefault();

    public static Date toDate(ZonedDateTime zonedDateTime) {
        return Date.from(zonedDateTime.toInstant());
    }

    public static Date toDate(LocalDateTime localDateTime) {
        return Date.from(localDateTime.atZone(systemDefaultZone).toInstant());
    }

    private static Long toEpochSecond(ZonedDateTime zonedDateTime){
        return zonedDateTime.toInstant().getEpochSecond();
    }

    public static ZonedDateTime toZoneDateTime(Long epochSecond) {
        return ZonedDateTime.ofInstant(Instant.ofEpochSecond(epochSecond), systemDefaultZone);
    }

    public static ZonedDateTime toZoneDateTime(Date date) {
        return ZonedDateTime.ofInstant(date.toInstant(), systemDefaultZone);
    }

    public static LocalDateTime toLocalDateTime(Date date) {
        return LocalDateTime.ofInstant(date.toInstant(), systemDefaultZone);
    }

    public static LocalDateTime toLocalDateTime(String strDate, String pattern){
        return LocalDateTime.parse(strDate, DateTimeFormatter.ofPattern(pattern));
    }

}