Java 8 の DateTimeFormatter の曜日等のフォーマットについて
DateTimeFormatter を利用して曜日などのフォーマットを行おうとすると、実際どういうふうにフォーマットされるのかよくわからんということになる。
https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html をちらっと見ると、以下のように書いてあって、各シンボルが何を表すのかよくわからない。
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
GGG などのように、同じ文字列を複数回続けることによって任意の形式で出力することができるのだが、この様式は以下のようになっている。
Date fields: Pattern letters to output a date.
Pattern Count Equivalent builder methods
------- ----- --------------------------
G 1 appendText(ChronoField.ERA, TextStyle.SHORT)
GG 2 appendText(ChronoField.ERA, TextStyle.SHORT)
GGG 3 appendText(ChronoField.ERA, TextStyle.SHORT)
GGGG 4 appendText(ChronoField.ERA, TextStyle.FULL)
GGGGG 5 appendText(ChronoField.ERA, TextStyle.NARROW)
u 1 appendValue(ChronoField.YEAR, 1, 19, SignStyle.NORMAL);
uu 2 appendValueReduced(ChronoField.YEAR, 2, 2000);
uuu 3 appendValue(ChronoField.YEAR, 3, 19, SignStyle.NORMAL);
u..u 4..n appendValue(ChronoField.YEAR, n, 19, SignStyle.EXCEEDS_PAD);
y 1 appendValue(ChronoField.YEAR_OF_ERA, 1, 19, SignStyle.NORMAL);
yy 2 appendValueReduced(ChronoField.YEAR_OF_ERA, 2, 2000);
yyy 3 appendValue(ChronoField.YEAR_OF_ERA, 3, 19, SignStyle.NORMAL);
y..y 4..n appendValue(ChronoField.YEAR_OF_ERA, n, 19, SignStyle.EXCEEDS_PAD);
Y 1 append special localized WeekFields element for numeric week-based-year
YY 2 append special localized WeekFields element for reduced numeric week-based-year 2 digits;
YYY 3 append special localized WeekFields element for numeric week-based-year (3, 19, SignStyle.NORMAL);
Y..Y 4..n append special localized WeekFields element for numeric week-based-year (n, 19, SignStyle.EXCEEDS_PAD);
Q 1 appendValue(IsoFields.QUARTER_OF_YEAR);
QQ 2 appendValue(IsoFields.QUARTER_OF_YEAR, 2);
QQQ 3 appendText(IsoFields.QUARTER_OF_YEAR, TextStyle.SHORT)
QQQQ 4 appendText(IsoFields.QUARTER_OF_YEAR, TextStyle.FULL)
QQQQQ 5 appendText(IsoFields.QUARTER_OF_YEAR, TextStyle.NARROW)
q 1 appendValue(IsoFields.QUARTER_OF_YEAR);
qq 2 appendValue(IsoFields.QUARTER_OF_YEAR, 2);
qqq 3 appendText(IsoFields.QUARTER_OF_YEAR, TextStyle.SHORT_STANDALONE)
qqqq 4 appendText(IsoFields.QUARTER_OF_YEAR, TextStyle.FULL_STANDALONE)
qqqqq 5 appendText(IsoFields.QUARTER_OF_YEAR, TextStyle.NARROW_STANDALONE)
M 1 appendValue(ChronoField.MONTH_OF_YEAR);
MM 2 appendValue(ChronoField.MONTH_OF_YEAR, 2);
MMM 3 appendText(ChronoField.MONTH_OF_YEAR, TextStyle.SHORT)
MMMM 4 appendText(ChronoField.MONTH_OF_YEAR, TextStyle.FULL)
MMMMM 5 appendText(ChronoField.MONTH_OF_YEAR, TextStyle.NARROW)
L 1 appendValue(ChronoField.MONTH_OF_YEAR);
LL 2 appendValue(ChronoField.MONTH_OF_YEAR, 2);
LLL 3 appendText(ChronoField.MONTH_OF_YEAR, TextStyle.SHORT_STANDALONE)
LLLL 4 appendText(ChronoField.MONTH_OF_YEAR, TextStyle.FULL_STANDALONE)
LLLLL 5 appendText(ChronoField.MONTH_OF_YEAR, TextStyle.NARROW_STANDALONE)
w 1 append special localized WeekFields element for numeric week-of-year
ww 1 append special localized WeekFields element for numeric week-of-year, zero-padded
W 1 append special localized WeekFields element for numeric week-of-month
d 1 appendValue(ChronoField.DAY_OF_MONTH)
dd 2 appendValue(ChronoField.DAY_OF_MONTH, 2)
D 1 appendValue(ChronoField.DAY_OF_YEAR)
DD 2 appendValue(ChronoField.DAY_OF_YEAR, 2)
DDD 3 appendValue(ChronoField.DAY_OF_YEAR, 3)
F 1 appendValue(ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH)
E 1 appendText(ChronoField.DAY_OF_WEEK, TextStyle.SHORT)
EE 2 appendText(ChronoField.DAY_OF_WEEK, TextStyle.SHORT)
EEE 3 appendText(ChronoField.DAY_OF_WEEK, TextStyle.SHORT)
EEEE 4 appendText(ChronoField.DAY_OF_WEEK, TextStyle.FULL)
EEEEE 5 appendText(ChronoField.DAY_OF_WEEK, TextStyle.NARROW)
e 1 append special localized WeekFields element for numeric day-of-week
ee 2 append special localized WeekFields element for numeric day-of-week, zero-padded
eee 3 appendText(ChronoField.DAY_OF_WEEK, TextStyle.SHORT)
eeee 4 appendText(ChronoField.DAY_OF_WEEK, TextStyle.FULL)
eeeee 5 appendText(ChronoField.DAY_OF_WEEK, TextStyle.NARROW)
c 1 append special localized WeekFields element for numeric day-of-week
ccc 3 appendText(ChronoField.DAY_OF_WEEK, TextStyle.SHORT_STANDALONE)
cccc 4 appendText(ChronoField.DAY_OF_WEEK, TextStyle.FULL_STANDALONE)
ccccc 5 appendText(ChronoField.DAY_OF_WEEK, TextStyle.NARROW_STANDALONE)
Time fields: Pattern letters to output a time.
Pattern Count Equivalent builder methods
------- ----- --------------------------
a 1 appendText(ChronoField.AMPM_OF_DAY, TextStyle.SHORT)
h 1 appendValue(ChronoField.CLOCK_HOUR_OF_AMPM)
hh 2 appendValue(ChronoField.CLOCK_HOUR_OF_AMPM, 2)
H 1 appendValue(ChronoField.HOUR_OF_DAY)
HH 2 appendValue(ChronoField.HOUR_OF_DAY, 2)
k 1 appendValue(ChronoField.CLOCK_HOUR_OF_DAY)
kk 2 appendValue(ChronoField.CLOCK_HOUR_OF_DAY, 2)
K 1 appendValue(ChronoField.HOUR_OF_AMPM)
KK 2 appendValue(ChronoField.HOUR_OF_AMPM, 2)
m 1 appendValue(ChronoField.MINUTE_OF_HOUR)
mm 2 appendValue(ChronoField.MINUTE_OF_HOUR, 2)
s 1 appendValue(ChronoField.SECOND_OF_MINUTE)
ss 2 appendValue(ChronoField.SECOND_OF_MINUTE, 2)
S..S 1..n appendFraction(ChronoField.NANO_OF_SECOND, n, n, false)
A 1 appendValue(ChronoField.MILLI_OF_DAY)
A..A 2..n appendValue(ChronoField.MILLI_OF_DAY, n)
n 1 appendValue(ChronoField.NANO_OF_SECOND)
n..n 2..n appendValue(ChronoField.NANO_OF_SECOND, n)
N 1 appendValue(ChronoField.NANO_OF_DAY)
N..N 2..n appendValue(ChronoField.NANO_OF_DAY, n)
Zone ID: Pattern letters to output ZoneId.
Pattern Count Equivalent builder methods
------- ----- --------------------------
VV 2 appendZoneId()
z 1 appendZoneText(TextStyle.SHORT)
zz 2 appendZoneText(TextStyle.SHORT)
zzz 3 appendZoneText(TextStyle.SHORT)
zzzz 4 appendZoneText(TextStyle.FULL)
Zone offset: Pattern letters to output ZoneOffset.
Pattern Count Equivalent builder methods
------- ----- --------------------------
O 1 appendLocalizedOffsetPrefixed(TextStyle.SHORT);
OOOO 4 appendLocalizedOffsetPrefixed(TextStyle.FULL);
X 1 appendOffset("+HHmm","Z")
XX 2 appendOffset("+HHMM","Z")
XXX 3 appendOffset("+HH:MM","Z")
XXXX 4 appendOffset("+HHMMss","Z")
XXXXX 5 appendOffset("+HH:MM:ss","Z")
x 1 appendOffset("+HHmm","+00")
xx 2 appendOffset("+HHMM","+0000")
xxx 3 appendOffset("+HH:MM","+00:00")
xxxx 4 appendOffset("+HHMMss","+0000")
xxxxx 5 appendOffset("+HH:MM:ss","+00:00")
Z 1 appendOffset("+HHMM","+0000")
ZZ 2 appendOffset("+HHMM","+0000")
ZZZ 3 appendOffset("+HHMM","+0000")
ZZZZ 4 appendLocalizedOffset(TextStyle.FULL);
ZZZZZ 5 appendOffset("+HH:MM:ss","Z")
Modifiers: Pattern letters that modify the rest of the pattern:
Pattern Count Equivalent builder methods
------- ----- --------------------------
[ 1 optionalStart()
] 1 optionalEnd()
p..p 1..n padNext(n)
これは、 https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatterBuilder.html#appendPattern-java.lang.String- のコピペである。DateTimeFormatter のフォーマットの仕方が DateTimeFormatterBuilder の方にあるので、たどりつくのが難しい。
実際どのようにフォーマットされるのかを確認する
実際にどのようにフォーマットされるのかを確認しておけば、後々便利であろう。
package datetimeformattersample;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
/**
*
* @author tokuhirom
*/
public class DateTimeFormatterSample {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
String[][] patterns = new String[][]{
new String[]{"G", "appendText(ChronoField.ERA,"},
new String[]{"GG", "appendText(ChronoField.ERA,"},
new String[]{"GGG", "appendText(ChronoField.ERA,"},
new String[]{"GGGG", "appendText(ChronoField.ERA,"},
new String[]{"GGGGG", "appendText(ChronoField.ERA,"},
new String[]{"", ""},
new String[]{"u", "appendValue(ChronoField.YEAR,"},
new String[]{"uu", "appendValueReduced(ChronoField.YEAR,"},
new String[]{"uuu", "appendValue(ChronoField.YEAR,"},
new String[]{"uuuu", "appendValue(ChronoField.YEAR,"},
new String[]{"y", "appendValue(ChronoField.YEAR_OF_ERA,"},
new String[]{"yy", "appendValueReduced(ChronoField.YEAR_OF_ERA,"},
new String[]{"yyy", "appendValue(ChronoField.YEAR_OF_ERA,"},
new String[]{"yyyy", "appendValue(ChronoField.YEAR_OF_ERA,"},
new String[]{"Y", "append"},
new String[]{"YY", "append"},
new String[]{"YYY", "append"},
new String[]{"YYYY", "append"},
new String[]{"", ""},
new String[]{"Q", "appendValue(IsoFields.QUARTER_OF_YEAR);"},
new String[]{"QQ", "appendValue(IsoFields.QUARTER_OF_YEAR,"},
new String[]{"QQQ", "appendText(IsoFields.QUARTER_OF_YEAR,"},
new String[]{"QQQQ", "appendText(IsoFields.QUARTER_OF_YEAR,"},
new String[]{"QQQQQ", "appendText(IsoFields.QUARTER_OF_YEAR,"},
new String[]{"q", "appendValue(IsoFields.QUARTER_OF_YEAR);"},
new String[]{"qq", "appendValue(IsoFields.QUARTER_OF_YEAR,"},
new String[]{"qqq", "appendText(IsoFields.QUARTER_OF_YEAR,"},
new String[]{"qqqq", "appendText(IsoFields.QUARTER_OF_YEAR,"},
new String[]{"qqqqq", "appendText(IsoFields.QUARTER_OF_YEAR,"},
new String[]{"", ""},
new String[]{"M", "appendValue(ChronoField.MONTH_OF_YEAR);"},
new String[]{"MM", "appendValue(ChronoField.MONTH_OF_YEAR,"},
new String[]{"MMM", "appendText(ChronoField.MONTH_OF_YEAR,"},
new String[]{"MMMM", "appendText(ChronoField.MONTH_OF_YEAR,"},
new String[]{"MMMMM", "appendText(ChronoField.MONTH_OF_YEAR,"},
new String[]{"L", "appendValue(ChronoField.MONTH_OF_YEAR);"},
new String[]{"LL", "appendValue(ChronoField.MONTH_OF_YEAR,"},
new String[]{"LLL", "appendText(ChronoField.MONTH_OF_YEAR,"},
new String[]{"LLLL", "appendText(ChronoField.MONTH_OF_YEAR,"},
new String[]{"LLLLL", "appendText(ChronoField.MONTH_OF_YEAR,"},
new String[]{"", ""},
new String[]{"w", "append"},
new String[]{"ww", "append"},
new String[]{"W", "append"},
new String[]{"d", "appendValue(ChronoField.DAY_OF_MONTH)"},
new String[]{"dd", "appendValue(ChronoField.DAY_OF_MONTH,"},
new String[]{"D", "appendValue(ChronoField.DAY_OF_YEAR)"},
new String[]{"DD", "appendValue(ChronoField.DAY_OF_YEAR,"},
new String[]{"DDD", "appendValue(ChronoField.DAY_OF_YEAR,"},
new String[]{"F", "appendValue(ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH)"},
new String[]{"E", "appendText(ChronoField.DAY_OF_WEEK,"},
new String[]{"EE", "appendText(ChronoField.DAY_OF_WEEK,"},
new String[]{"EEE", "appendText(ChronoField.DAY_OF_WEEK,"},
new String[]{"EEEE", "appendText(ChronoField.DAY_OF_WEEK,"},
new String[]{"EEEEE", "appendText(ChronoField.DAY_OF_WEEK,"},
new String[]{"e", "append"},
new String[]{"ee", "append"},
new String[]{"eee", "appendText(ChronoField.DAY_OF_WEEK,"},
new String[]{"eeee", "appendText(ChronoField.DAY_OF_WEEK,"},
new String[]{"eeeee", "appendText(ChronoField.DAY_OF_WEEK,"},
new String[]{"c", "append"},
new String[]{"ccc", "appendText(ChronoField.DAY_OF_WEEK,"},
new String[]{"cccc", "appendText(ChronoField.DAY_OF_WEEK,"},
new String[]{"ccccc", "appendText(ChronoField.DAY_OF_WEEK,"},
new String[]{"a", "appendText(ChronoField.AMPM_OF_DAY,"},
new String[]{"h", "appendValue(ChronoField.CLOCK_HOUR_OF_AMPM)"},
new String[]{"hh", "appendValue(ChronoField.CLOCK_HOUR_OF_AMPM,"},
new String[]{"H", "appendValue(ChronoField.HOUR_OF_DAY)"},
new String[]{"HH", "appendValue(ChronoField.HOUR_OF_DAY,"},
new String[]{"k", "appendValue(ChronoField.CLOCK_HOUR_OF_DAY)"},
new String[]{"kk", "appendValue(ChronoField.CLOCK_HOUR_OF_DAY,"},
new String[]{"K", "appendValue(ChronoField.HOUR_OF_AMPM)"},
new String[]{"KK", "appendValue(ChronoField.HOUR_OF_AMPM,"},
new String[]{"m", "appendValue(ChronoField.MINUTE_OF_HOUR)"},
new String[]{"mm", "appendValue(ChronoField.MINUTE_OF_HOUR,"},
new String[]{"s", "appendValue(ChronoField.SECOND_OF_MINUTE)"},
new String[]{"ss", "appendValue(ChronoField.SECOND_OF_MINUTE,"},
new String[]{"", ""},
new String[]{"SSSS", "appendFraction(ChronoField.NANO_OF_SECOND,"},
new String[]{"A", "appendValue(ChronoField.MILLI_OF_DAY)"},
new String[]{"AAAA", "appendValue(ChronoField.MILLI_OF_DAY,"},
new String[]{"n", "appendValue(ChronoField.NANO_OF_SECOND)"},
new String[]{"nnnn", "appendValue(ChronoField.NANO_OF_SECOND,"},
new String[]{"N", "appendValue(ChronoField.NANO_OF_DAY)"},
new String[]{"NNNN", "appendValue(ChronoField.NANO_OF_DAY,"},
new String[]{"VV", "appendZoneId()"},
new String[]{"z", "appendZoneText(TextStyle.SHORT)"},
new String[]{"zz", "appendZoneText(TextStyle.SHORT)"},
new String[]{"zzz", "appendZoneText(TextStyle.SHORT)"},
new String[]{"zzzz", "appendZoneText(TextStyle.FULL)"},
new String[]{"O", "appendLocalizedOffsetPrefixed(TextStyle.SHORT);"},
new String[]{"OOOO", "appendLocalizedOffsetPrefixed(TextStyle.FULL);"},
new String[]{"X", "appendOffset(\"+HHmm\",\"Z\")"},
new String[]{"XX", "appendOffset(\"+HHMM\",\"Z\")"},
new String[]{"XXX", "appendOffset(\"+HH:MM\",\"Z\")"},
new String[]{"XXXX", "appendOffset(\"+HHMMss\",\"Z\")"},
new String[]{"XXXXX", "appendOffset(\"+HH:MM:ss\",\"Z\")"},
new String[]{"x", "appendOffset(\"+HHmm\",\"+00\")"},
new String[]{"xx", "appendOffset(\"+HHMM\",\"+0000\")"},
new String[]{"xxx", "appendOffset(\"+HH:MM\",\"+00:00\")"},
new String[]{"xxxx", "appendOffset(\"+HHMMss\",\"+0000\")"},
new String[]{"xxxxx", "appendOffset(\"+HH:MM:ss\",\"+00:00\")"},
new String[]{"Z", "appendOffset(\"+HHMM\",\"+0000\")"},
new String[]{"ZZ", "appendOffset(\"+HHMM\",\"+0000\")"},
new String[]{"ZZZ", "appendOffset(\"+HHMM\",\"+0000\")"},
new String[]{"ZZZZ", "appendLocalizedOffset(TextStyle.FULL);"},
new String[]{"ZZZZZ", "appendOffset(\"+HH:MM:ss\",\"Z\")"}
};
ZonedDateTime zonedDateTime = LocalDateTime
.parse("2015-07-13T12:27:04")
.atZone(ZoneId.of("Asia/Tokyo"));
System.out.printf("%-7s : %-19s\t%-19s // %s\n", "Pattern", "English", "Japanese", "Comment");
for (String[] pattern : patterns) {
try {
DateTimeFormatter enFormatter = DateTimeFormatter.ofPattern(pattern[0], Locale.ENGLISH);
String en = zonedDateTime.format(enFormatter);
DateTimeFormatter jpFormatter = DateTimeFormatter.ofPattern(pattern[0], Locale.JAPAN);
String jp = zonedDateTime.format(jpFormatter);
System.out.printf("%-7s : %-19s\t%-19s // %s\n", pattern[0], en, jp, pattern[1]);
} catch (java.time.DateTimeException e) {
System.err.printf("cannot format '%s': %s", pattern[0], e.getMessage());
}
}
}
}
出力例は以下のようになる。
Pattern : English Japanese // Comment
G : AD 西暦 // appendText(ChronoField.ERA,
GG : AD 西暦 // appendText(ChronoField.ERA,
GGG : AD 西暦 // appendText(ChronoField.ERA,
GGGG : Anno Domini 西暦 // appendText(ChronoField.ERA,
GGGGG : A A // appendText(ChronoField.ERA,
: //
u : 2015 2015 // appendValue(ChronoField.YEAR,
uu : 15 15 // appendValueReduced(ChronoField.YEAR,
uuu : 2015 2015 // appendValue(ChronoField.YEAR,
uuuu : 2015 2015 // appendValue(ChronoField.YEAR,
y : 2015 2015 // appendValue(ChronoField.YEAR_OF_ERA,
yy : 15 15 // appendValueReduced(ChronoField.YEAR_OF_ERA,
yyy : 2015 2015 // appendValue(ChronoField.YEAR_OF_ERA,
yyyy : 2015 2015 // appendValue(ChronoField.YEAR_OF_ERA,
Y : 2015 2015 // append
YY : 15 15 // append
YYY : 2015 2015 // append
YYYY : 2015 2015 // append
: //
Q : 3 3 // appendValue(IsoFields.QUARTER_OF_YEAR);
QQ : 03 03 // appendValue(IsoFields.QUARTER_OF_YEAR,
QQQ : Q3 Q3 // appendText(IsoFields.QUARTER_OF_YEAR,
QQQQ : 3rd quarter 第3四半期 // appendText(IsoFields.QUARTER_OF_YEAR,
QQQQQ : 3 3 // appendText(IsoFields.QUARTER_OF_YEAR,
q : 3 3 // appendValue(IsoFields.QUARTER_OF_YEAR);
qq : 03 03 // appendValue(IsoFields.QUARTER_OF_YEAR,
qqq : 3 3 // appendText(IsoFields.QUARTER_OF_YEAR,
qqqq : 3 3 // appendText(IsoFields.QUARTER_OF_YEAR,
qqqqq : 3 3 // appendText(IsoFields.QUARTER_OF_YEAR,
: //
M : 7 7 // appendValue(ChronoField.MONTH_OF_YEAR);
MM : 07 07 // appendValue(ChronoField.MONTH_OF_YEAR,
MMM : Jul 7 // appendText(ChronoField.MONTH_OF_YEAR,
MMMM : July 7月 // appendText(ChronoField.MONTH_OF_YEAR,
MMMMM : J J // appendText(ChronoField.MONTH_OF_YEAR,
L : 7 7 // appendValue(ChronoField.MONTH_OF_YEAR);
LL : 07 07 // appendValue(ChronoField.MONTH_OF_YEAR,
LLL : 7 7 // appendText(ChronoField.MONTH_OF_YEAR,
LLLL : 7 7 // appendText(ChronoField.MONTH_OF_YEAR,
LLLLL : 7 7 // appendText(ChronoField.MONTH_OF_YEAR,
: //
w : 29 29 // append
cannot format 'DD': Field DayOfYear cannot be printed as the value 194 exceeds the maximum print width of 2
ww : 29 29 // append
W : 3 3 // append
d : 13 13 // appendValue(ChronoField.DAY_OF_MONTH)
dd : 13 13 // appendValue(ChronoField.DAY_OF_MONTH,
D : 194 194 // appendValue(ChronoField.DAY_OF_YEAR)
DDD : 194 194 // appendValue(ChronoField.DAY_OF_YEAR,
F : 6 6 // appendValue(ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH)
E : Mon 月 // appendText(ChronoField.DAY_OF_WEEK,
EE : Mon 月 // appendText(ChronoField.DAY_OF_WEEK,
EEE : Mon 月 // appendText(ChronoField.DAY_OF_WEEK,
EEEE : Monday 月曜日 // appendText(ChronoField.DAY_OF_WEEK,
EEEEE : M 月 // appendText(ChronoField.DAY_OF_WEEK,
e : 2 2 // append
ee : 02 02 // append
eee : Mon 月 // appendText(ChronoField.DAY_OF_WEEK,
eeee : Monday 月曜日 // appendText(ChronoField.DAY_OF_WEEK,
eeeee : M 月 // appendText(ChronoField.DAY_OF_WEEK,
c : 2 2 // append
ccc : Mon 月 // appendText(ChronoField.DAY_OF_WEEK,
cannot format 'AAAA': Field MilliOfDay cannot be printed as the value 44824000 exceeds the maximum print width of 4
cccc : Monday 月曜日 // appendText(ChronoField.DAY_OF_WEEK,
ccccc : 1 1 // appendText(ChronoField.DAY_OF_WEEK,
a : PM 午後 // appendText(ChronoField.AMPM_OF_DAY,
cannot format 'NNNN': Field NanoOfDay cannot be printed as the value 44824000000000 exceeds the maximum print width of 4
h : 12 12 // appendValue(ChronoField.CLOCK_HOUR_OF_AMPM)
hh : 12 12 // appendValue(ChronoField.CLOCK_HOUR_OF_AMPM,
H : 12 12 // appendValue(ChronoField.HOUR_OF_DAY)
HH : 12 12 // appendValue(ChronoField.HOUR_OF_DAY,
k : 12 12 // appendValue(ChronoField.CLOCK_HOUR_OF_DAY)
kk : 12 12 // appendValue(ChronoField.CLOCK_HOUR_OF_DAY,
K : 0 0 // appendValue(ChronoField.HOUR_OF_AMPM)
KK : 00 00 // appendValue(ChronoField.HOUR_OF_AMPM,
m : 27 27 // appendValue(ChronoField.MINUTE_OF_HOUR)
mm : 27 27 // appendValue(ChronoField.MINUTE_OF_HOUR,
s : 4 4 // appendValue(ChronoField.SECOND_OF_MINUTE)
ss : 04 04 // appendValue(ChronoField.SECOND_OF_MINUTE,
: //
SSSS : 0000 0000 // appendFraction(ChronoField.NANO_OF_SECOND,
A : 44824000 44824000 // appendValue(ChronoField.MILLI_OF_DAY)
n : 0 0 // appendValue(ChronoField.NANO_OF_SECOND)
nnnn : 0000 0000 // appendValue(ChronoField.NANO_OF_SECOND,
N : 44824000000000 44824000000000 // appendValue(ChronoField.NANO_OF_DAY)
VV : Asia/Tokyo Asia/Tokyo // appendZoneId()
z : JST JST // appendZoneText(TextStyle.SHORT)
zz : JST JST // appendZoneText(TextStyle.SHORT)
zzz : JST JST // appendZoneText(TextStyle.SHORT)
zzzz : Japan Standard Time 日本標準時 // appendZoneText(TextStyle.FULL)
O : GMT+9 GMT+9 // appendLocalizedOffsetPrefixed(TextStyle.SHORT);
OOOO : GMT+09:00 GMT+09:00 // appendLocalizedOffsetPrefixed(TextStyle.FULL);
X : +09 +09 // appendOffset("+HHmm","Z")
XX : +0900 +0900 // appendOffset("+HHMM","Z")
XXX : +09:00 +09:00 // appendOffset("+HH:MM","Z")
XXXX : +0900 +0900 // appendOffset("+HHMMss","Z")
XXXXX : +09:00 +09:00 // appendOffset("+HH:MM:ss","Z")
x : +09 +09 // appendOffset("+HHmm","+00")
xx : +0900 +0900 // appendOffset("+HHMM","+0000")
xxx : +09:00 +09:00 // appendOffset("+HH:MM","+00:00")
xxxx : +0900 +0900 // appendOffset("+HHMMss","+0000")
xxxxx : +09:00 +09:00 // appendOffset("+HH:MM:ss","+00:00")
Z : +0900 +0900 // appendOffset("+HHMM","+0000")
ZZ : +0900 +0900 // appendOffset("+HHMM","+0000")
ZZZ : +0900 +0900 // appendOffset("+HHMM","+0000")
ZZZZ : GMT+09:00 GMT+09:00 // appendLocalizedOffset(TextStyle.FULL);
ZZZZZ : +09:00 +09:00 // appendOffset("+HH:MM:ss","Z")
この一覧表を参考にしながらコーディングすれば、簡単にフォーマットできる。と思う。
先日公開した、Java8 Date and Time の cheat sheet にも追記した。 https://gist.github.com/tokuhirom/0b7441684653cb85cefa