1. LocalDateTime parsing and formatting examples
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | public static LocalDateTime parseTime(String timeStr, String format) { return LocalDateTime.parse(timeStr, DateTimeFormatter.ofPattern(format)); } static String formatTime(LocalDateTime time, String format) { return DateTimeFormatter.ofPattern(format).format(time); } static String formatTime2(LocalDateTime time, String format) { return time.format(DateTimeFormatter.ofPattern(format)); } public static void main(String[] args) { LocalDateTime time = parseTime( "2018-08-21 21:45:31", "yyyy-MM-dd HH:mm:ss"); String timeStr = formatTime(time, "yyyyMMdd_HHmmss"); String timeStr2 = formatTime2(time, "yyyyMMdd_HHmmss"); System.out.println(time); System.out.println(timeStr); System.out.println(timeStr2); } |
Output:
2018-08-21T21:45:31 20180821_214531 20180821_214531
2. Date and Time Format
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
3. Predefined Formatters
| Formatter | Description | Example |
|---|---|---|
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' |
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