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java:8:datetime

Java 8 Date & Time

java.util.Date <-> LocalDate/LocalDateTime/Instant간 변환

/**
 * Calls {@link #asLocalDate(Date, ZoneId)} with the system default time zone.
 */
public static LocalDate asLocalDate(java.util.Date date) {
    return asLocalDate(date, ZoneId.systemDefault());
}
 
/**
 * Creates {@link LocalDate} from {@code java.util.Date} or it's subclasses. Null-safe.
 */
public static LocalDate asLocalDate(java.util.Date date, ZoneId zone) {
    if (date == null) {
        return null;
    }
 
    if (date instanceof java.sql.Date) {
        return ((java.sql.Date) date).toLocalDate();
    } else {
        return Instant.ofEpochMilli(date.getTime()).atZone(zone).toLocalDate();
    }
}
 
/**
 * Calls {@link #asLocalDateTime(Date, ZoneId)} with the system default time zone.
 */
public static LocalDateTime asLocalDateTime(java.util.Date date) {
    return asLocalDateTime(date, ZoneId.systemDefault());
}
 
/**
 * Creates {@link LocalDateTime} from {@code java.util.Date} or it's subclasses. Null-safe.
 */
public static LocalDateTime asLocalDateTime(java.util.Date date, ZoneId zone) {
    if (date == null) {
        return null;
    }
 
    if (date instanceof java.sql.Timestamp) {
        return ((java.sql.Timestamp) date).toLocalDateTime();
    } else {
        return Instant.ofEpochMilli(date.getTime()).atZone(zone).toLocalDateTime();
    }
}
 
/**
 * Calls {@link #asUtilDate(Object, ZoneId)} with the system default time zone.
 */
public static java.util.Date asUtilDate(Object date) {
    return asUtilDate(date, ZoneId.systemDefault());
}
 
/**
 * Creates a {@link java.util.Date} from various date objects. Is null-safe. Currently supports:<ul>
 * <li>{@link java.util.Date}
 * <li>{@link java.sql.Date}
 * <li>{@link java.sql.Timestamp}
 * <li>{@link java.time.LocalDate}
 * <li>{@link java.time.LocalDateTime}
 * <li>{@link java.time.ZonedDateTime}
 * <li>{@link java.time.Instant}
 * </ul>
 *
 * @param zone Time zone, used only if the input object is LocalDate or LocalDateTime.
 *
 * @return {@link java.util.Date} (exactly this class, not a subclass, such as java.sql.Date)
 */
public static java.util.Date asUtilDate(Object date, ZoneId zone) {
    if (date == null) {
        return null;
    }
 
    if (date instanceof java.sql.Date || date instanceof java.sql.Timestamp) {
        return new java.util.Date(((java.util.Date) date).getTime());
    }
    if (date instanceof java.util.Date) {
        return (java.util.Date) date;
    }
    if (date instanceof LocalDate) {
        return Date.from(((LocalDate) date).atStartOfDay(zone).toInstant());
    }
    if (date instanceof LocalDateTime) {
        return Date.from(((LocalDateTime) date).atZone(zone).toInstant());
    }
    if (date instanceof ZonedDateTime) {
        return Date.from(((ZonedDateTime) date).toInstant());
    }
    if (date instanceof Instant) {
        return Date.from((Instant) date);
    }
 
    throw new UnsupportedOperationException("Don't know hot to convert " + date.getClass().getName() + " to java.util.Date");
}
 
/**
 * Creates an {@link Instant} from {@code java.util.Date} or it's subclasses. Null-safe.
 */
public static Instant asInstant(Date date) {
    if (date == null) {
        return null;
    } else {
        return Instant.ofEpochMilli(date.getTime());
    }
}
 
/**
 * Calls {@link #asZonedDateTime(Date, ZoneId)} with the system default time zone.
 */
public static ZonedDateTime asZonedDateTime(Date date) {
    return asZonedDateTime(date, ZoneId.systemDefault());
}
 
/**
 * Creates {@link ZonedDateTime} from {@code java.util.Date} or it's subclasses. Null-safe.
 */
public static ZonedDateTime asZonedDateTime(Date date, ZoneId zone) {
    if (date == null) {
        return null;
    } else {
        return asInstant(date).atZone(zone);
    }
}

Time Mocking for test

java/8/datetime.txt · 마지막으로 수정됨: 2020/01/29 13:33 저자 kwon37xi