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java:8:datetime

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java:8:datetime [2016/09/28 16:18]
kwon37xi
java:8:datetime [2020/01/29 13:33]
kwon37xi [Java 8 Date & Time]
줄 1: 줄 1:
 ====== Java 8 Date & Time ====== ====== Java 8 Date & Time ======
 +  * [[java:dateformat|Java DateFormat]]
   * [[http://www.oracle.com/technetwork/articles/java/jf14-date-time-2125367.html|Java SE 8 Date and Time]]   * [[http://www.oracle.com/technetwork/articles/java/jf14-date-time-2125367.html|Java SE 8 Date and Time]]
   * [[http://www.mkyong.com/java8/java-8-convert-date-to-localdate-and-localdatetime/|Java 8 – Convert Date to LocalDate and LocalDateTime]]   * [[http://www.mkyong.com/java8/java-8-convert-date-to-localdate-and-localdatetime/|Java 8 – Convert Date to LocalDate and LocalDateTime]]
 +  * [[https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html#ISO_LOCAL_DATE_TIME|DateTimeFormatter#ISO_LOCAL_DATE_TIME]] : LocalDateTime ISO 8601 표준 포맷터 ''2011-12-03T10:15:30'' 
 +  * [[https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html#ISO_OFFSET_DATE_TIME|DateTimeFormatter#ISO_OFFSET_DATE_TIME]] : Offset DateTime ISO 8601 표준 포맷터 ''2011-12-03T10:15:30+01:00''
 ===== java.util.Date <-> LocalDate/LocalDateTime/Instant간 변환 ===== ===== java.util.Date <-> LocalDate/LocalDateTime/Instant간 변환 =====
   * [[http://stackoverflow.com/questions/21242110/convert-java-util-date-to-java-time-localdate|datetime - Convert java.util.Date to java.time.LocalDate]]   * [[http://stackoverflow.com/questions/21242110/convert-java-util-date-to-java-time-localdate|datetime - Convert java.util.Date to java.time.LocalDate]]
  
 <code java> <code java>
- 
 /** /**
  * Calls {@link #asLocalDate(Date, ZoneId)} with the system default time zone.  * Calls {@link #asLocalDate(Date, ZoneId)} with the system default time zone.
줄 19: 줄 20:
  */  */
 public static LocalDate asLocalDate(java.util.Date date, ZoneId zone) { public static LocalDate asLocalDate(java.util.Date date, ZoneId zone) {
-    if (date == null)+    if (date == null) {
         return null;         return null;
 +    }
  
     if (date instanceof java.sql.Date) {     if (date instanceof java.sql.Date) {
줄 40: 줄 42:
  */  */
 public static LocalDateTime asLocalDateTime(java.util.Date date, ZoneId zone) { public static LocalDateTime asLocalDateTime(java.util.Date date, ZoneId zone) {
-    if (date == null)+    if (date == null) {
         return null;         return null;
 +    }
  
-    if (date instanceof java.sql.Timestamp)+    if (date instanceof java.sql.Timestamp) {
         return ((java.sql.Timestamp) date).toLocalDateTime();         return ((java.sql.Timestamp) date).toLocalDateTime();
-    else+    else {
         return Instant.ofEpochMilli(date.getTime()).atZone(zone).toLocalDateTime();         return Instant.ofEpochMilli(date.getTime()).atZone(zone).toLocalDateTime();
 +    }
 } }
  
줄 72: 줄 76:
  */  */
 public static java.util.Date asUtilDate(Object date, ZoneId zone) { public static java.util.Date asUtilDate(Object date, ZoneId zone) {
-    if (date == null)+    if (date == null) {
         return null;         return null;
 +    }
  
-    if (date instanceof java.sql.Date || date instanceof java.sql.Timestamp)+    if (date instanceof java.sql.Date || date instanceof java.sql.Timestamp) {
         return new java.util.Date(((java.util.Date) date).getTime());         return new java.util.Date(((java.util.Date) date).getTime());
-    if (date instanceof java.util.Date)+    
 +    if (date instanceof java.util.Date) {
         return (java.util.Date) date;         return (java.util.Date) date;
-    if (date instanceof LocalDate) +    
-        return java.util.Date.from(((LocalDate) date).atStartOfDay(zone).toInstant()); +    if (date instanceof LocalDate) { 
-    if (date instanceof LocalDateTime) +        return Date.from(((LocalDate) date).atStartOfDay(zone).toInstant()); 
-        return java.util.Date.from(((LocalDateTime) date).atZone(zone).toInstant()); +    } 
-    if (date instanceof ZonedDateTime) +    if (date instanceof LocalDateTime) { 
-        return java.util.Date.from(((ZonedDateTime) date).toInstant()); +        return Date.from(((LocalDateTime) date).atZone(zone).toInstant()); 
-    if (date instanceof Instant) +    } 
-        return java.util.Date.from((Instant) date);+    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");     throw new UnsupportedOperationException("Don't know hot to convert " + date.getClass().getName() + " to java.util.Date");
줄 125: 줄 136:
   * refer to [[http://docs.oracle.com/javase/8/docs/api/java/time/Clock.html|java.time.Clock]]   * refer to [[http://docs.oracle.com/javase/8/docs/api/java/time/Clock.html|java.time.Clock]]
   * [[http://blog.freeside.co/2015/01/15/fixing-current-time-for-tests-with-java-8-s-date-time-api/|Ad-Hockery - Fixing current time for tests with Java 8's date/time API]]   * [[http://blog.freeside.co/2015/01/15/fixing-current-time-for-tests-with-java-8-s-date-time-api/|Ad-Hockery - Fixing current time for tests with Java 8's date/time API]]
 +  * [[http://www.baeldung.com/java-override-system-time|Overriding System Time for Testing in Java | Baeldung]]
 +
java/8/datetime.txt · 마지막으로 수정됨: 2022/05/11 16:47 저자 kwon37xi