format(DateTimeFormatter.ofPattern("uu-MM-dd HH:mm")

jetpack compose 사용 예:

Text(text = note.entryDate //ofPattern("EEE, d MMM")
   .format(DateTimeFormatter.ofPattern("uu-MM-dd HH:mm")),
   style = MaterialTheme.typography.caption
)

"u-M-d(E) H:m"   => 2023-03-01(월) 23:22  // Y 보다는 u를 사용할 것을 권장함

Class DateTimeFormatter

• java.lang.Object
  • java.time.format.DateTimeFormatter
    

    public final class DateTimeFormatter
    extends Object

    Formatter for printing and parsing date-time objects.

    This class provides the main application entry point for printing and parsing and provides common implementations of DateTimeFormatter:

    • Using predefined constants, such as ISO_LOCAL_DATE
    • Using pattern letters, such as uuuu-MMM-dd
    • Using localized styles, such as long or medium

    More complex formatters are provided by DateTimeFormatterBuilder.

    The main date-time classes provide two methods - one for formatting, format(DateTimeFormatter formatter), and one for parsing, parse(CharSequence text, DateTimeFormatter formatter).

    For example:

      LocalDate date = LocalDate.now();
      String text = date.format(formatter);
      LocalDate parsedDate = LocalDate.parse(text, formatter);

    In addition to the format, formatters can be created with desired Locale, Chronology, ZoneId, and DecimalStyle.

    The withLocale method returns a new formatter that overrides the locale. The locale affects some aspects of formatting and parsing. For example, the ofLocalizedDate provides a formatter that uses the locale specific date format.

    The withChronology method returns a new formatter that overrides the chronology. If overridden, the date-time value is converted to the chronology before formatting. During parsing the date-time value is converted to the chronology before it is returned.

    The withZone method returns a new formatter that overrides the zone. If overridden, the date-time value is converted to a ZonedDateTime with the requested ZoneId before formatting. During parsing the ZoneId is applied before the value is returned.

    The withDecimalStyle method returns a new formatter that overrides the DecimalStyle. The DecimalStyle symbols are used for formatting and parsing.

    Some applications may need to use the older java.text.Format class for formatting. The toFormat() method returns an implementation of java.text.Format.

    Predefined Formatters

    FormatterDescriptionExample

    ofLocalizedDate(dateStyle)	Formatter with date style from the locale	'2011-12-03'
    ofLocalizedTime(timeStyle)	Formatter with time style from the locale	'10:15:30'
    ofLocalizedDateTime(dateTimeStyle)	Formatter with a style for date and time from the locale	'3 Jun 2008 11:05:30'
    ofLocalizedDateTime(dateStyle,timeStyle)	Formatter with date and time styles from the locale	'3 Jun 2008 11:05'
    BASIC_ISO_DATE	Basic ISO date	'20111203'
    ISO_LOCAL_DATE	ISO Local Date	'2011-12-03'
    ISO_OFFSET_DATE	ISO Date with offset	'2011-12-03+01:00'
    ISO_DATE	ISO Date with or without offset	'2011-12-03+01:00'; '2011-12-03'
    ISO_LOCAL_TIME	Time without offset	'10:15:30'
    ISO_OFFSET_TIME	Time with offset	'10:15:30+01:00'
    ISO_TIME	Time with or without offset	'10:15:30+01:00'; '10:15:30'
    ISO_LOCAL_DATE_TIME	ISO Local Date and Time	'2011-12-03T10:15:30'
    ISO_OFFSET_DATE_TIME	Date Time with Offset	2011-12-03T10:15:30+01:00'
    ISO_ZONED_DATE_TIME	Zoned Date Time	'2011-12-03T10:15:30+01:00[Europe/Paris]'
    ISO_DATE_TIME	Date and time with ZoneId	'2011-12-03T10:15:30+01:00[Europe/Paris]'
    ISO_ORDINAL_DATE	Year and day of year	'2012-337'
    ISO_WEEK_DATE	Year and Week	2012-W48-6'
    ISO_INSTANT	Date and Time of an Instant	'2011-12-03T10:15:30Z'
    RFC_1123_DATE_TIME	RFC 1123 / RFC 822	'Tue, 3 Jun 2008 11:05:30 GMT'

    Patterns for Formatting and Parsing

    Patterns are based on a simple sequence of letters and symbols. A pattern is used to create a Formatter using the ofPattern(String) and ofPattern(String, Locale) methods. For example, "d MMM uuuu" will format 2011-12-03 as '3 Dec 2011'. A formatter created from a pattern can be used as many times as necessary, it is immutable and is thread-safe.

    For example:

      LocalDate date = LocalDate.now();
      DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy MM dd");
      String text = date.format(formatter);
      LocalDate parsedDate = LocalDate.parse(text, formatter);

    All letters 'A' to 'Z' and 'a' to 'z' are reserved as pattern letters. The following pattern letters are defined:

      Symbol  Meaning                  Presentation   Examples
      ------  -------                   -----------   -------
       G    era                         text         AD; Anno Domini; A
       u    year                        year         2004; 04
       y    year-of-era                 year         2004; 04
       D    day-of-year                 number       189
       M/L  month-of-year               number/text  7; 07; Jul; July; J
       d    day-of-month                number       10
    
       Q/q quarter-of-year             number/text    3; 03; Q3; 3rd quarter
       Y   week-based-year             year           1996; 96
       w   week-of-week-based-year     number         27
       W   week-of-month               number         4
       E   day-of-week                 text           Tue; Tuesday; T
       e/c localized day-of-week       number/text    2; 02; Tue; Tuesday; T
       F   week-of-month               number         3
    
       a   am-pm-of-day                text        PM
       h   clock-hour-of-am-pm (1-12)  number      12
       K   hour-of-am-pm (0-11)        number      0
       k   clock-hour-of-am-pm (1-24)  number      0
    
       H   hour-of-day (0-23)          number      0
       m   minute-of-hour              number      30
       s   second-of-minute            number      55
       S   fraction-of-second          fraction    978
       A   milli-of-day                number      1234
       n   nano-of-second              number      987654321
       N   nano-of-day                 number      1234000000
    
       V   time-zone ID                zone-id     America/Los_Angeles; Z; -08:30
       z   time-zone name              zone-name   Pacific Standard Time; PST
       O   localized zone-offset       offset-O    GMT+8; GMT+08:00; UTC-08:00;
       X   zone-offset 'Z' for zero   offset-X    Z; -08; -0830; -08:30; -083015; -08:30:15;
       x    zone-offset           offset-x    +0000; -08; -0830; -08:30; -083015; -08:30:15;
       Z    zone-offset                 offset-Z    +0000; -0800; -08:00;
    
       p    pad next                    pad modifier   1
    
       '    escape for text             delimiter
       ''   single quote                literal        '
       [    optional section start
       ]    optional section end
       #    reserved for future use
       {    reserved for future use
       }    reserved for future use