DatePipelink
Formats a date value according to locale rules.
根据区域设置规则格式化日期值。
输入值
value | any | The date expression: a 日期表达式: |
参数
format | 'mediumDate' | The date/time components to include, using predefined options or a custom format string. 要包含的日期、时间部分的格式,使用预定义选项或自定义格式字符串。 可选. 默认值是 |
timezone | string | A timezone offset (such as 一个时区偏移(比如 可选. 默认值是 |
locale | string | A locale code for the locale format rules to use. When not supplied, uses the value of 要使用的区域格式规则的区域代码。 如果不提供,就使用 可选. 默认值是 |
参见
说明
Only the en-US
locale data comes with Angular. To localize dates in another language, you must import the corresponding locale data. See the I18n guide for more information.
Angular 只自带了 en-US
区域的数据。要想在其它语言中对日期进行本地化,你必须导入相应的区域数据。 欲知详情,参见 I18n guide。
使用说明
The result of this pipe is not reevaluated when the input is mutated. To avoid the need to reformat the date on every change-detection cycle, treat the date as an immutable object and change the reference when the pipe needs to run again.
当输入值发生变化时,该管道的结果并不会改变。如果不想在每个变更检测周期中都强制重新格式化该日期,请把日期看做一个不可变对象, 当需要让该管道重新运行时,请赋给它一个新的对象,以更改它的引用。
Pre-defined format options
预定义的格式选项
Examples are given in en-US
locale.
下面是 en-US
区域的例子。
'short'
: equivalent to'M/d/yy, h:mm a'
(6/15/15, 9:03 AM
).'short'
: 等价于'M/d/yy, h:mm a'
(6/15/15, 9:03 AM
).'medium'
: equivalent to'MMM d, y, h:mm:ss a'
(Jun 15, 2015, 9:03:01 AM
).'medium'
: 等价于'MMM d, y, h:mm:ss a'
(Jun 15, 2015, 9:03:01 AM
).'long'
: equivalent to'MMMM d, y, h:mm:ss a z'
(`June 15, 2015 at 9:03:01 AM'long'
: 等价于'MMMM d, y, h:mm:ss a z'
(`June 15, 2015 at 9:03:01 AM
GMT+1`).
'full'
: equivalent to'EEEE, MMMM d, y, h:mm:ss a zzzz'
(`Monday, June 15, 2015 at'full'
: 等价于'EEEE, MMMM d, y, h:mm:ss a zzzz'
(`Monday, June 15, 2015 at
9:03:01 AM GMT+01:00`).
'shortDate'
: equivalent to'M/d/yy'
(6/15/15
).'shortDate'
: 等价于'M/d/yy'
(6/15/15
).'mediumDate'
: equivalent to'MMM d, y'
(Jun 15, 2015
).'mediumDate'
: 等价于'MMM d, y'
(Jun 15, 2015
).'longDate'
: equivalent to'MMMM d, y'
(June 15, 2015
).'longDate'
: 等价于'MMMM d, y'
(June 15, 2015
).'fullDate'
: equivalent to'EEEE, MMMM d, y'
(Monday, June 15, 2015
).'fullDate'
: 等价于'EEEE, MMMM d, y'
(Monday, June 15, 2015
).'shortTime'
: equivalent to'h:mm a'
(9:03 AM
).'shortTime'
: 等价于'h:mm a'
(9:03 AM
).'mediumTime'
: equivalent to'h:mm:ss a'
(9:03:01 AM
).'mediumTime'
: 等价于'h:mm:ss a'
(9:03:01 AM
).'longTime'
: equivalent to'h:mm:ss a z'
(9:03:01 AM GMT+1
).'longTime'
: 等价于'h:mm:ss a z'
(9:03:01 AM GMT+1
).'fullTime'
: equivalent to'h:mm:ss a zzzz'
(9:03:01 AM GMT+01:00
).'fullTime'
: 等价于'h:mm:ss a zzzz'
(9:03:01 AM GMT+01:00
).
Custom format options
自定义格式选项
You can construct a format string using symbols to specify the components of a date-time value, as described in the following table. Format details depend on the locale. Fields marked with (*) are only available in the extra data set for the given locale.
你可以使用符号来构造出格式字符串,以指定日期-时间值的各个部分,如下表所示。 具体格式取决于区域设置。 标 *
的字段表示仅在特定区域的数据中才有效。
G, GG & GGG | AD | ||
GGGG | Anno Domini | ||
GGGGG | A | ||
y | 2, 20, 201, 2017, 20173 | ||
yy | 02, 20, 01, 17, 73 | ||
yyy | 002, 020, 201, 2017, 20173 | ||
yyyy | 0002, 0020, 0201, 2017, 20173 | ||
M | 9, 12 | ||
MM | 09, 12 | ||
MMM | Sep | ||
MMMM | September | ||
MMMMM | S | ||
L | 9, 12 | ||
LL | 09, 12 | ||
LLL | Sep | ||
LLLL | September | ||
LLLLL | S | ||
w | 1... 53 | ||
ww | 01... 53 | ||
W | 1... 5 | ||
d | 1 | ||
dd | 01 | ||
E, EE & EEE | Tue | ||
EEEE | Tuesday | ||
EEEEE | T | ||
EEEEEE | Tu | ||
a, aa & aaa | am/pm or AM/PM | ||
aaaa | a when missing)a ) | ante meridiem/post meridiem | |
aaaaa | a/p | ||
B, BB & BBB | mid. | ||
BBBB | am, pm, midnight, noon, morning, afternoon, evening, night | ||
BBBBB | md | ||
b, bb & bbb | mid. | ||
bbbb | am, pm, midnight, noon, morning, afternoon, evening, night | ||
bbbbb | md | ||
h | 1, 12 | ||
hh | 01, 12 | ||
H | 0, 23 | ||
HH | 00, 23 | ||
m | 8, 59 | ||
mm | 08, 59 | ||
s | 0... 59 | ||
ss | 00... 59 | ||
S | 0... 9 | ||
SS | 00... 99 | ||
SSS | 000... 999 | ||
z, zz & zzz | GMT-8 | ||
zzzz | GMT-08:00 | ||
Z, ZZ & ZZZ | ISO8601 | -0800 | |
ZZZZ | GMT-8:00 | ||
ZZZZZ | ISO8601 | -08:00 | |
O, OO & OOO | GMT-8 | ||
OOOO | GMT-08:00 |
Note that timezone correction is not applied to an ISO string that has no time component, such as "2016-09-19"
请注意,时区校正不适用于没有时间部分的ISO字符串,例如“2016-09-19”
Format examples
格式范例
These examples transform a date into various formats, assuming that dateObj
is a JavaScript Date
object for year: 2015, month: 6, day: 15, hour: 21, minute: 43, second: 11, given in the local time for the en-US
locale.
下面这些例子会把日期转换成多种格式。 这里假设 dateObj
是个 JavaScript 的 Date
对象: 2015 年 6 月 15 日 21 时 43 分 11 秒, 使用的是 en-US
区域的当地时间。
Usage example
使用范例
The following component uses a date pipe to display the current date in different formats.
下列组件借助一个日期管道来以不同的格式显示当前日期。