README

缺失日期类的实现

只读属性

int $year
int $month
int $day

string $month00
	// the month with leading zeroes (01-12)
string $day00
	// the day with leading zeroes (01-31)

int $dayOfWeek
	// starts with Sunday indexed from 0
int $dayOfWeekISO
	// starts with Monday indexed from 0
int $dayOfWeekM0
	// starts with Monday indexed from 0
int $dayOfWeekM1
	// starts with Monday indexed from 1
int $dayOfWeekS0
	// starts with Sunday indexed from 0
int $dayOfWeekS1
	// starts with Sunday indexed from 1

int $week
	// ISO-8601 week number of year, weeks starting on Monday
int $yearOfWeek
	// the year of week can be different from the date’s year

bool $isLeapYear
	// whether it's a leap year
int $dayOfYear
	// the day of the year (starting from 0)
int $days
	// number of days in the given month

实例化

public function __construct(string $date = 'today', $format = 'Y-m-d')
	// https://php.ac.cn/manual/en/datetime.createfromformat.php

static createFromFormat(string $date = 'today', $format = 'Y-m-d'): self
static createFromDateTime(\DateTime $date): self
static createFromWeek($year, $week, $day = 1): self

创建副本

copyMutable(): Date
copyImmutable(): DateImmutable
copy(): self

转换为字符串

format($format):string
__toString():string // Y-m-d

比较两个日期

diff(Date|DateImmutable $diff):\DateInterval
diffDays(Date|DateImmutable $diff):int
	// returns signed integer

获取 \DateTime 对象

• Date 返回嵌入的 \DateTime 对象
• DateImmutable 返回 \DateTime 对象的副本

getDate(): \DateTime;

修改日期（DateImmutable 中不可用）

modify($modify): $this;
	// https://php.ac.cn/manual/en/datetime.modify.php

add(int $year = 0, int $month = 0, int $day = 0, int $week = 0): $this;
sub(int $year = 0, int $month = 0, int $day = 0, int $week = 0): $this;
	// adds and subtracts years, months, days, weeks from/to the current date

setDate($year = null, $month = null, $day = null): $this
setWeek($week = null, $day = null, $year = null): $this;
	// if any argument’s value is null, it refers the current year, day, week, month