PHP Manual
DateTimeImmutable
Parses a time string according to a specified format

DateTimeImmutable::createFromFormat

date_create_immutable_from_format

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

DateTimeImmutable::createFromFormat -- date_create_immutable_from_format — Parses a time string according to a specified format

說明

物件導向風格

public static DateTimeImmutable::createFromFormat(string $format, string $datetime, ?DateTimeZone $timezone = null): DateTimeImmutable|false

過程化風格

date_create_immutable_from_format(string $format, string $datetime, ?DateTimeZone $timezone = null): DateTimeImmutable|false

Returns a new DateTimeImmutable object representing the date and time specified by the datetime string, which was formatted in the given format.

參數

format

The format that the passed in string should be in. See the formatting options below. In most cases, the same letters as for the date() can be used.

The format is parsed from left to right, which means that in some situations the order in which the format characters are present effects the result. In the case of z (the day of the year), it is required that a year has already been parsed, for example through the Y or y characters.

Letters that are used for parsing numbers allow a wide range of values, outside of what the logical range would be. For example, the d (day of the month) accepts values in the range from 00 to 99. The only constraint is on the amount of digits. The date/time parser's overflow mechanism is used when out-of-range values are given. The examples below show some of this behaviour.

**The following characters are recognized in the `format` parameter string**
`format` character	Description	Example parsable values
Day	---	---
`d` and `j`	Day of the month, 2 digits with or without leading zeros	`01` to `31` or `1` to `31`. (2 digit numbers higher than the number of days in the month are accepted, in which case they will make the month overflow. For example using 33 with January, means February 2nd)
`D` and `l`	A textual representation of a day	`Mon` through `Sun` or `Sunday` through `Saturday`. If the day name given is different then the day name belonging to a parsed (or default) date is different, then an overflow occurs to the next date with the given day name. See the examples below for an explanation.
`S`	English ordinal suffix for the day of the month, 2 characters. It's ignored while processing.	`st`, `nd`, `rd` or `th`.
`z`	The day of the year (starting from 0); must be preceded by `Y` or `y`.	`0` through `365`. (3 digit numbers higher than the numbers in a year are accepted, in which case they will make the year overflow. For example using 366 with 2022, means January 2nd, 2023)
Month	---	---
`F` and `M`	A textual representation of a month, such as January or Sept	`January` through `December` or `Jan` through `Dec`
`m` and `n`	Numeric representation of a month, with or without leading zeros	`01` through `12` or `1` through `12`. (2 digit numbers higher than 12 are accepted, in which case they will make the year overflow. For example using 13 means January in the next year)
Year	---	---
`X` and `x`	A full numeric representation of a year, up to 19 digits, optionally prefixed by `+` or `-`	Examples: `0055`, `787`, `1999`, `-2003`, `+10191`
`Y`	A full numeric representation of a year, up to 4 digits	Examples: `0055`, `787`, `1999`, `2003`
`y`	A two digit representation of a year (which is assumed to be in the range 1970-2069, inclusive)	Examples: `99` or `03` (which will be interpreted as `1999` and `2003`, respectively)
Time	---	---
`a` and `A`	Ante meridiem and Post meridiem	`am` or `pm`
`g` and `h`	12-hour format of an hour with or without leading zero	`1` through `12` or `01` through `12` (2 digit numbers higher than 12 are accepted, in which case they will make the day overflow. For example using `14` means `02` in the next AM/PM period)
`G` and `H`	24-hour format of an hour with or without leading zeros	`0` through `23` or `00` through `23` (2 digit numbers higher than 24 are accepted, in which case they will make the day overflow. For example using `26` means `02:00` the next day)
`i`	Minutes with leading zeros	`00` to `59`. (2 digit numbers higher than 59 are accepted, in which case they will make the hour overflow. For example using `66` means `:06` the next hour)
`s`	Seconds, with leading zeros	`00` through `59` (2 digit numbers higher than 59 are accepted, in which case they will make the minute overflow. For example using `90` means `:30` the next minute)
`v`	Fraction in milliseconds (up to three digits)	Example: `12` (`0.12` seconds), `345` (`0.345` seconds)
`u`	Fraction in microseconds (up to six digits)	Example: `45` (`0.45` seconds), `654321` (`0.654321` seconds)
Timezone	---	---
`e`, `O`, `P` and `T`	Timezone identifier, or difference to UTC in hours, or difference to UTC with colon between hours and minutes, or timezone abbreviation	Examples: `UTC`, `GMT`, `Atlantic/Azores` or `+0200` or `+02:00` or `EST`, `MDT`
Full Date/Time	---	---
`U`	Seconds since the Unix Epoch (January 1 1970 00:00:00 GMT)	Example: `1292177455`
Whitespace and Separators	---	---
(space)	One space or one tab	Example:
`#`	One of the following separation symbol: `;`, `:`, `/`, `.`, `,`, `-`, `(` or `)`	Example: `/`
`;`, `:`, `/`, `.`, `,`, `-`, `(` or `)`	The specified character.	Example: `-`
`?`	A random byte	Example: `^` (Be aware that for UTF-8 characters you might need more than one `?`. In this case, using `*` is probably what you want instead)
`*`	Random bytes until the next separator or digit	Example: `` in `Y--d` with the string `2009-aWord-08` will match `aWord`
`!`	Resets all fields (year, month, day, hour, minute, second, fraction and timezone information) to zero-like values ( `0` for hour, minute, second and fraction, `1` for month and day, `1970` for year and `UTC` for timezone information)	Without `!,` all fields will be set to the current date and time.
`\|`	Resets all fields (year, month, day, hour, minute, second, fraction and timezone information) to zero-like values if they have not been parsed yet	`Y-m-d\|` will set the year, month and day to the information found in the string to parse, and sets the hour, minute and second to 0.
`+`	If this format specifier is present, trailing data in the string will not cause an error, but a warning instead	Use DateTimeImmutable::getLastErrors() to find out whether trailing data was present.

Unrecognized characters in the format string will cause the parsing to fail and an error message is appended to the returned structure. You can query error messages with DateTimeImmutable::getLastErrors().

To include literal characters in format, you have to escape them with a backslash (\).

If format does not contain the character ! then portions of the generated date/time which are not specified in format will be set to the current system time.

If format contains the character !, then portions of the generated date/time not provided in format, as well as values to the left-hand side of the !, will be set to corresponding values from the Unix epoch.

If any time character is parsed, then all other time-related fields are set to "0", unless also parsed.

The Unix epoch is 1970-01-01 00:00:00 UTC.

datetime

String representing the time.

timezone

A DateTimeZone object representing the desired time zone.

If timezone is omitted or null and datetime contains no timezone, the current timezone will be used.

注意:
The timezone parameter and the current timezone are ignored when the datetime parameter either contains a UNIX timestamp (e.g. 946684800) or specifies a timezone (e.g. 2010-01-28T15:00:00+02:00).

返回值

Returns a new DateTimeImmutable instance 或者在失敗時返回 false.

更新日誌

版本	說明
8.2.0	The `X` and `x` `format` specifiers have been added.
7.3.0	The `v` `format` specifier has been added.

範例

示例 #1 DateTimeImmutable::createFromFormat() example

物件導向風格

 <?php
$date = DateTimeImmutable::createFromFormat('j-M-Y', '15-Feb-2009');
echo $date->format('Y-m-d');
?>

示例 #2 Intricacies of DateTimeImmutable::createFromFormat()

 <?php
echo 'Current time: ' . date('Y-m-d H:i:s') . "\n";

$format = 'Y-m-d';
$date = DateTimeImmutable::createFromFormat($format, '2009-02-15');
echo "Format: $format; " . $date->format('Y-m-d H:i:s') . "\n";

$format = 'Y-m-d H:i:s';
$date = DateTimeImmutable::createFromFormat($format, '2009-02-15 15:16:17');
echo "Format: $format; " . $date->format('Y-m-d H:i:s') . "\n";

$format = 'Y-m-!d H:i:s';
$date = DateTimeImmutable::createFromFormat($format, '2009-02-15 15:16:17');
echo "Format: $format; " . $date->format('Y-m-d H:i:s') . "\n";

$format = '!d';
$date = DateTimeImmutable::createFromFormat($format, '15');
echo "Format: $format; " . $date->format('Y-m-d H:i:s') . "\n";

$format = 'i';
$date = DateTimeImmutable::createFromFormat($format, '15');
echo "Format: $format; " . $date->format('Y-m-d H:i:s') . "\n";
?>

以上例程的輸出類似於：

Current time: 2022-06-02 15:50:46
Format: Y-m-d; 2009-02-15 15:50:46
Format: Y-m-d H:i:s; 2009-02-15 15:16:17
Format: Y-m-!d H:i:s; 1970-01-15 15:16:17
Format: !d; 1970-01-15 00:00:00
Format: i; 2022-06-02 00:15:00

示例 #3 Format string with literal characters

 <?php
echo DateTimeImmutable::createFromFormat('H\h i\m s\s','23h 15m 03s')->format('H:i:s');
?>

以上例程的輸出類似於：

23:15:03

示例 #4 Overflow behaviour

 <?php
echo DateTimeImmutable::createFromFormat('Y-m-d H:i:s', '2021-17-35 16:60:97')->format(DateTimeImmutable::RFC2822);
?>

以上例程的輸出類似於：

Sat, 04 Jun 2022 17:01:37 +0000

Although the result looks odd, it is correct, as the following overflows happen:

97 seconds overflows to 1 minute, leaving 37 seconds.
61 minutes overflows to 1 hour, leaving 1 minutes.
35 days overflows to 1 month, leaving 4 days. The amount of days that are left over depends on the month, as not every month has the same amount of days.
18 months overflows to 1 year, leaving 6 months.

示例 #5 Overflowing day name behaviour

 <?php
$d = DateTime::createFromFormat(DateTimeInterface::RFC1123, 'Mon, 3 Aug 2020 25:00:00 +0000');
echo $d->format(DateTime::RFC1123), "\n";
?>

以上例程的輸出類似於：

Mon, 10 Aug 2020 01:00:00 +0000

Although the result looks odd, it is correct, as the following overflows happen:

3 Aug 2020 25:00:00 overflows to (Tue) 4 Aug 2020 01:00.
Mon gets applied, which advances the date to Mon, 10 Aug 2020 01:00:00. The explanation of relative keywords such as Mon is explained in the section on relative formats.

In order to detect overflows in dates, you can use the DateTimeImmutable::getLastErrors() name, which will include a warning if an overflow occured.

示例 #6 Detecting overflown dates

 <?php
$d = DateTimeImmutable::createFromFormat('Y-m-d H:i:s', '2021-17-35 16:60:97');
echo $d->format(DateTimeImmutable::RFC2822), "\n\n";

var_dump(DateTimeImmutable::GetLastErrors());
?>

以上例程的輸出類似於：

Sat, 04 Jun 2022 17:01:37 +0000

array(4) {
  'warning_count' =>
  int(2)
  'warnings' =>
  array(1) {
    [19] =>
    string(27) "The parsed date was invalid"
  }
  'error_count' =>
  int(0)
  'errors' =>
  array(0) {
  }
}

參見

DateTimeImmutable::__construct() - Returns new DateTimeImmutable object
DateTimeImmutable::getLastErrors() - Returns the warnings and errors
checkdate() - 驗證一個格里高里日期
strptime() - 解析由 strftime 產生的日期／時間

DateTimeImmutable::createFromFormat

date_create_immutable_from_format

說明

參數

返回值

更新日誌

範例

參見

Leave a Reply