README

PHP DateFns is a PHP adaptation of the JavaScript date-fns toolkit (v4.1.0), bringing the same functional, immutable date utilities to PHP 8 projects. The sections below link to the generated PHP documentation for every helper.

Installation

Install via Composer:

composer require rkr/date-fns

Quick start

<?php

use DateFns\DateFns;

$date = new DateTimeImmutable('2024-02-10 13:45:00');
$shifted = DateFns::add($date, ['days' => 5, 'hours' => 2]);

echo DateFns::format($shifted, 'yyyy-MM-dd HH:mm:ss');

Credits

• Original JavaScript implementation: date-fns by Sasha Koss and the date-fns community.
• Huge thanks to Sasha Koss for creating date-fns and sharing it with everyone—this PHP port happily stands on your shoulders.

Funktionen

Common Helpers

• DateFns::add($date, array $duration): DateTimeInterface
  Add the specified years, months, weeks, days, hours, minutes, and seconds to the given date.
• DateFns::closestIndexTo($dateToCompare, DateTimeInterface|string|int|null ...$dates): ?int
  Return an index of the closest date from the given dates comparing to the given date.
• DateFns::closestTo($dateToCompare, DateTimeInterface|string|int|null ...$dates): ?DateTimeInterface
  Return a date from the given dates closest to the given date.
• DateFns::compareAsc($dateLeft, $dateRight): int
  Compare the two dates and return -1, 0, or 1.
• DateFns::compareDesc($dateLeft, $dateRight): int
  Compare the two dates reverse chronologically and return -1, 0, or 1.
• DateFns::format($date, string $formatStr): string
  Format the date.
• DateFns::formatDistance($date, $baseDate, array $options = []): string
  Return the distance between the given dates in words.
• DateFns::formatDistanceStrict($date, $baseDate, array $options = []): string
  Return the distance between the given dates in words.
• DateFns::formatDistanceToNow($date, array $options = []): string
  Return the distance between the given date and now in words.
• DateFns::formatDistanceToNowStrict($date, array $options = []): string
  Return the distance between the given date and now in words.
• DateFns::formatDuration(array $duration, array $options = []): string
  Formats a duration in human-readable format
• DateFns::formatISO($date, array $options = []): string
  Format the date according to the ISO 8601 standard (https://support.sas.com/documentation/cdl/en/lrdict/64316/HTML/default/viewer.htm#a003169814.htm).
• DateFns::formatISO9075($date, array $options = []): string
  Format the date according to the ISO 9075 standard (https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_get-format).
• DateFns::formatISODuration($duration): string
  Format a duration object according as ISO 8601 duration string
• DateFns::formatRelative($date, $baseDate, array $options = []): string
  Represent the date in words relative to the given base date.
• DateFns::formatRFC3339($date, array $options = []): string
  Format the date according to the RFC 3339 standard (https://tools.ietf.org/html/rfc3339#section-5.6).
• DateFns::formatRFC7231($date): string
  Format the date according to the RFC 7231 standard (https://tools.ietf.org/html/rfc7231#section-7.1.1.1).
• DateFns::getDefaultOptions(): array
  Get default options.
• DateFns::intervalToDuration(DateTimeInterface|string|int $start, DateTimeInterface|string|int $end): array
  Convert interval to duration
• DateFns::intlFormat($date, array $formatOptions = [], array $localeOptions = []): string
  Format the date with Intl.DateTimeFormat (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat).
• DateFns::intlFormatDistance($laterDate, $earlierDate, array $options = []): string
  Formats distance between two dates in a human-readable format
• DateFns::isAfter($date, $dateToCompare): bool
  Is the first date after the second one?
• DateFns::isBefore($date, $dateToCompare): bool
  Is the first date before the second one?
• DateFns::isDate($value): bool
  Is the given value a date?
• DateFns::isEqual($dateLeft, $dateRight): bool
  Are the given dates equal?
• DateFns::isExists(int $year, int $month, int $day): bool
  Is the given date exists?
• DateFns::isFuture($date): bool
  Is the given date in the future?
• DateFns::isMatch(string $dateString, string $formatString, array $options = []): bool
  validates the date string against given formats
• DateFns::isPast($date): bool
  Is the given date in the past?
• DateFns::isValid($date): bool
  Is the given date valid?
• DateFns::lightFormat($date, string $format): string
  Format the date.
• DateFns::max(DateTimeInterface|string|int ...$dates): DateTimeImmutable
  Return the latest of the given dates.
• DateFns::min(DateTimeInterface|string|int ...$dates): DateTimeImmutable
  Returns the earliest of the given dates.
• DateFns::parse(string $dateString, string $formatString, $referenceDate, array $options = []): DateTimeImmutable
  Parse the date.
• DateFns::parseISO(string $argument, array $options = []): DateTimeImmutable
  Parse ISO string
• DateFns::set($date, array $values): DateTimeImmutable
  Set date values to a given date.
• DateFns::setDefaultOptions(array $options): void
  Set default options including locale.
• DateFns::sub($date, array $duration): DateTimeImmutable
  Subtract the specified years, months, weeks, days, hours, minutes, and seconds from the given date.
• DateFns::toDate($argument): DateTimeImmutable
  Convert the given argument to an instance of Date.

Conversion Helpers

• DateFns::daysToWeeks(int $days): int
  Convert days to weeks.
• DateFns::hoursToMilliseconds(int $hours): int
  Convert hours to milliseconds.
• DateFns::hoursToMinutes(int $hours): int
  Convert hours to minutes.
• DateFns::hoursToSeconds(int $hours): int
  Convert hours to seconds.
• DateFns::millisecondsToHours(int $milliseconds): int
  Convert milliseconds to hours.
• DateFns::millisecondsToMinutes(int $milliseconds): int
  Convert milliseconds to minutes.
• DateFns::millisecondsToSeconds(int $milliseconds): int
  Convert milliseconds to seconds.
• DateFns::minutesToHours(int $minutes): int
  Convert minutes to hours.
• DateFns::minutesToMilliseconds(int $minutes): int
  Convert minutes to milliseconds.
• DateFns::minutesToSeconds(int $minutes): int
  Convert minutes to seconds.
• DateFns::monthsToQuarters(int $months): int
  Convert number of months to quarters.
• DateFns::monthsToYears(int $months): int
  Convert number of months to years.
• DateFns::quartersToMonths(int $quarters): int
  Convert number of quarters to months.
• DateFns::quartersToYears(int $quarters): int
  Convert number of quarters to years.
• DateFns::secondsToHours(int $seconds): int
  Convert seconds to hours.
• DateFns::secondsToMilliseconds(int $seconds): int
  Convert seconds to milliseconds.
• DateFns::secondsToMinutes(int $seconds): int
  Convert seconds to minutes.
• DateFns::weeksToDays(int $weeks): int
  Convert weeks to days.
• DateFns::yearsToDays(int $years): int
  Convert years to days.
• DateFns::yearsToMonths(int $years): int
  Convert years to months.
• DateFns::yearsToQuarters(int $years): int
  Convert years to quarters.

Interval Helpers

• DateFns::areIntervalsOverlapping(DateTimeInterface|string|int $leftStart, DateTimeInterface|string|int $leftEnd, DateTimeInterface|string|int $rightStart, DateTimeInterface|string|int $rightEnd, array $options = []): bool
  Is the given time interval overlapping with another time interval?
• DateFns::clamp(DateTimeInterface|string|int $date, DateTimeInterface|string|int $min, DateTimeInterface|string|int $max): DateTimeImmutable
  Return a date bounded by the start and the end of the given interval.
• DateFns::eachDayOfInterval(DateTimeInterface|string|int $start, DateTimeInterface|string|int $end, array $options = []): array
  Return the array of dates within the specified time interval.
• DateFns::eachHourOfInterval(DateTimeInterface|string|int $start, DateTimeInterface|string|int $end, array $options = []): array
  Return the array of hours within the specified time interval.
• DateFns::eachMinuteOfInterval(DateTimeInterface|string|int $start, DateTimeInterface|string|int $end, array $options = []): array
  Return the array of minutes within the specified time interval.
• DateFns::eachMonthOfInterval(DateTimeInterface|string|int $start, DateTimeInterface|string|int $end, array $options = []): array
  Return the array of months within the specified time interval.
• DateFns::eachQuarterOfInterval(DateTimeInterface|string|int $start, DateTimeInterface|string|int $end, array $options = []): array
  Return the array of quarters within the specified time interval.
• DateFns::eachWeekendOfInterval(DateTimeInterface|string|int $start, DateTimeInterface|string|int $end): array
  List all the Saturdays and Sundays in the given date interval.
• DateFns::eachWeekOfInterval(DateTimeInterface|string|int $start, DateTimeInterface|string|int $end, array $options = []): array
  Return the array of weeks within the specified time interval.
• DateFns::eachYearOfInterval(DateTimeInterface|string|int $start, DateTimeInterface|string|int $end, array $options = []): array
  Return the array of yearly timestamps within the specified time interval.
• DateFns::getOverlappingDaysInIntervals(DateTimeInterface|string|int $leftStart, DateTimeInterface|string|int $leftEnd, DateTimeInterface|string|int $rightStart, DateTimeInterface|string|int $rightEnd): int
  Get the number of days that overlap in two time intervals
• DateFns::interval($start, $end, array $options = []): array
  Creates an interval object and validates its values.
• DateFns::isWithinInterval(DateTimeInterface|string|int $date, DateTimeInterface|string|int $start, DateTimeInterface|string|int $end): bool
  Is the given date within the interval?

Timestamp Helpers

• DateFns::fromUnixTime($unixTime): DateTimeImmutable
  Create a date from a Unix timestamp.
• DateFns::getTime($date): int
  Get the milliseconds timestamp of the given date.
• DateFns::getUnixTime($date): int
  Get the seconds timestamp of the given date.

Millisecond Helpers

• DateFns::addMilliseconds($date, int $amount): DateTimeImmutable
  Add the specified number of milliseconds to the given date.
• DateFns::differenceInMilliseconds($laterDate, $earlierDate): int
  Get the number of milliseconds between the given dates.
• DateFns::getMilliseconds($date): int
  Get the milliseconds of the given date.
• DateFns::milliseconds(array $duration): int
  Returns the number of milliseconds in the specified, years, months, weeks, days, hours, minutes, and seconds.
• DateFns::setMilliseconds($date, int $milliseconds): DateTimeImmutable
  Set the milliseconds to the given date.

Second Helpers

• DateFns::addSeconds($date, int $amount): DateTimeImmutable
  Add the specified number of seconds to the given date.
• DateFns::differenceInSeconds($laterDate, $earlierDate, array $options = []): int
  Get the number of seconds between the given dates.
• DateFns::endOfSecond($date): DateTimeImmutable
  Return the end of a second for the given date.
• DateFns::getSeconds($date): int
  Get the seconds of the given date.
• DateFns::isSameSecond($dateLeft, $dateRight): bool
  Are the given dates in the same second (and hour and day)?
• DateFns::isThisSecond($date): bool
  Is the given date in the same second as the current date?
• DateFns::setSeconds($date, int $seconds): DateTimeImmutable
  Set the seconds to the given date, with context support.
• DateFns::startOfSecond($date): DateTimeImmutable
  Return the start of a second for the given date.

Minute Helpers

• DateFns::addMinutes($date, int $amount): DateTimeImmutable
  Add the specified number of minutes to the given date.
• DateFns::differenceInMinutes($dateLeft, $dateRight, array $options = []): int
  Get the number of minutes between the given dates.
• DateFns::endOfMinute($date): DateTimeImmutable
  Return the end of a minute for the given date.
• DateFns::getMinutes($date): int
  Get the minutes of the given date.
• DateFns::isSameMinute($dateLeft, $dateRight): bool
  Are the given dates in the same minute (and hour and day)?
• DateFns::isThisMinute($date): bool
  Is the given date in the same minute as the current date?
• DateFns::roundToNearestMinutes($date, array $options = []): DateTimeImmutable
  Rounds the given date to the nearest minute
• DateFns::setMinutes($date, int $minutes): DateTimeImmutable
  Set the minutes to the given date.
• DateFns::startOfMinute($date): DateTimeImmutable
  Return the start of a minute for the given date.
• DateFns::subMinutes($date, int $amount): DateTimeImmutable
  Subtract the specified number of minutes from the given date.

Hour Helpers

• DateFns::addHours($date, int $amount): DateTimeImmutable
  Add the specified number of hours to the given date.
• DateFns::differenceInHours($laterDate, $earlierDate, array $options = []): int
  Get the number of hours between the given dates.
• DateFns::endOfHour($date): DateTimeImmutable
  Return the end of an hour for the given date.
• DateFns::getHours($date): int
  Get the hours of the given date.
• DateFns::isSameHour($dateLeft, $dateRight): bool
  Are the given dates in the same hour (and same day)?
• DateFns::isThisHour($date): bool
  Is the given date in the same hour as the current date?
• DateFns::roundToNearestHours($date, array $options = []): DateTimeImmutable
  Rounds the given date to the nearest hour
• DateFns::setHours($date, int $hours): DateTimeImmutable
  Set the hours to the given date.
• DateFns::startOfHour($date): DateTimeImmutable
  Return the start of an hour for the given date.
• DateFns::subHours($date, int $amount): DateTimeImmutable
  Subtract the specified number of hours from the given date.

Day Helpers

• DateFns::addBusinessDays($date, int $amount): DateTimeImmutable
  Add the specified number of business days (mon - fri) to the given date.
• DateFns::addDays($date, int $amount): DateTimeImmutable
  Add the specified number of days to the given date.
• DateFns::differenceInBusinessDays($laterDate, $earlierDate): int
  Get the number of business days between the given dates.
• DateFns::differenceInCalendarDays($laterDate, $earlierDate): int
  Get the number of calendar days between the given dates.
• DateFns::differenceInDays($laterDate, $earlierDate): int
  Get the number of full days between the given dates.
• DateFns::endOfDay($date): DateTimeImmutable
  Return the end of a day for the given date.
• DateFns::endOfToday(): DateTimeImmutable
  Return the end of today.
• DateFns::endOfTomorrow(): DateTimeImmutable
  Return the end of tomorrow.
• DateFns::endOfYesterday(): DateTimeImmutable
  Return the end of yesterday.
• DateFns::getDate($date): int
  Get the day of the month of the given date.
• DateFns::getDayOfYear($date): int
  Get the day of the year of the given date.
• DateFns::isSameDay($dateLeft, $dateRight): bool
  Are the given dates in the same day (and year and month)?
• DateFns::isToday($date): bool
  Is the given date today?
• DateFns::isTomorrow($date): bool
  Is the given date tomorrow?
• DateFns::isYesterday($date): bool
  Is the given date yesterday?
• DateFns::setDate($date, int $day): DateTimeImmutable
  Set the day of the month to the given date.
• DateFns::setDayOfYear($date, int $dayOfYear): DateTimeImmutable
  Set the day of the year to the given date.
• DateFns::startOfDay($date): DateTimeImmutable
  Return the start of a day for the given date.
• DateFns::startOfToday(): DateTimeImmutable
  Return the start of today.
• DateFns::startOfTomorrow(): DateTimeImmutable
  Return the start of tomorrow.
• DateFns::startOfYesterday(): DateTimeImmutable
  Return the start of yesterday.
• DateFns::subBusinessDays($date, int $amount): DateTimeImmutable
  Subtract the specified number of business days (mon - fri) from the given date.
• DateFns::subDays($date, int $amount): DateTimeImmutable
  Subtract the specified number of days from the given date.

Weekday Helpers

• DateFns::getDay(DateTimeInterface|int|float|string|null $date): int
  Get the day of the week of the given date.
• DateFns::getISODay(DateTimeInterface|int|float|string|null $date): int
  Get the day of the ISO week of the given date.
• DateFns::isFriday(DateTimeInterface|int|float|string|null $date): bool
  Is the given date Friday?
• DateFns::isMonday(DateTimeInterface|int|float|string|null $date): bool
  Is the given date Monday?
• DateFns::isSaturday(DateTimeInterface|int|float|string|null $date): bool
  Is the given date Saturday?
• DateFns::isSunday(DateTimeInterface|int|float|string|null $date): bool
  Is the given date Sunday?
• DateFns::isThursday(DateTimeInterface|int|float|string|null $date): bool
  Is the given date Thursday?
• DateFns::isTuesday(DateTimeInterface|int|float|string|null $date): bool
  Is the given date Tuesday?
• DateFns::isWednesday(DateTimeInterface|int|float|string|null $date): bool
  Is the given date Wednesday?
• DateFns::isWeekend(DateTimeInterface|int|float|string|null $date): bool
  Does the given date fall on a weekend?
• DateFns::nextDay(DateTimeInterface|int|float|string|null $date, int $day): DateTimeImmutable
  When is the next day of the week? 0-6 the day of the week, 0 represents Sunday.
• DateFns::nextFriday(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  When is the next Friday?
• DateFns::nextMonday(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  When is the next Monday?
• DateFns::nextSaturday(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  When is the next Saturday?
• DateFns::nextSunday(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  When is the next Sunday?
• DateFns::nextThursday(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  When is the next Thursday?
• DateFns::nextTuesday(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  When is the next Tuesday?
• DateFns::nextWednesday(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  When is the next Wednesday?
• DateFns::previousDay(DateTimeInterface|int|float|string|null $date, int $day): DateTimeImmutable
  When is the previous day of the week?
• DateFns::previousFriday(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  When is the previous Friday?
• DateFns::previousMonday(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  When is the previous Monday?
• DateFns::previousSaturday(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  When is the previous Saturday?
• DateFns::previousSunday(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  When is the previous Sunday?
• DateFns::previousThursday(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  When is the previous Thursday?
• DateFns::previousTuesday(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  When is the previous Tuesday?
• DateFns::previousWednesday(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  When is the previous Wednesday?
• DateFns::setDay(DateTimeInterface|int|float|string|null $date, int $day): DateTimeImmutable
  Set the day of the week to the given date.
• DateFns::setISODay(DateTimeInterface|int|float|string|null $date, int $isoDay): DateTimeImmutable
  Set the day of the ISO week to the given date.

Week Helpers

• DateFns::addWeeks($date, int $amount): DateTimeImmutable
  Add the specified number of weeks to the given date.
• DateFns::differenceInCalendarWeeks($laterDate, $earlierDate, array $options = []): int
  Get the number of calendar weeks between the given dates.
• DateFns::differenceInWeeks($laterDate, $earlierDate, array $options = []): int
  Get the number of full weeks between the given dates.
• DateFns::endOfWeek($date, array $options = []): DateTimeImmutable
  Return the end of a week for the given date.
• DateFns::getWeek($date, array $options = []): int
  Get the local week index of the given date.
• DateFns::getWeekOfMonth($date, array $options = []): int
  Get the week of the month of the given date.
• DateFns::getWeeksInMonth($date, array $options = []): int
  Get the number of calendar weeks a month spans.
• DateFns::isSameWeek($dateLeft, $dateRight, array $options = []): bool
  Are the given dates in the same week (and month and year)?
• DateFns::isThisWeek($date, array $options = []): bool
  Is the given date in the same week as the current date?
• DateFns::lastDayOfWeek($date, array $options = []): DateTimeImmutable
  Return the last day of a week for the given date.
• DateFns::setWeek($date, int $week, array $options = []): DateTimeImmutable
  Set the local week to the given date.
• DateFns::startOfWeek($date, array $options = []): DateTimeImmutable
  Return the start of a week for the given date.
• DateFns::subWeeks($date, int $amount): DateTimeImmutable
  Subtract the specified number of weeks from the given date.

ISO Week Helpers

• DateFns::differenceInCalendarISOWeeks(DateTimeInterface|int|float|string|null $laterDate, DateTimeInterface|int|float|string|null $earlierDate): int
  Get the number of calendar ISO weeks between the given dates.
• DateFns::endOfISOWeek(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the end of an ISO week for the given date.
• DateFns::getISOWeek(DateTimeInterface|int|float|string|null $date): int
  Get the ISO week of the given date.
• DateFns::isSameISOWeek(DateTimeInterface|int|float|string|null $dateLeft, DateTimeInterface|int|float|string|null $dateRight): bool
  Are the given dates in the same ISO week (and year)?
• DateFns::isThisISOWeek(DateTimeInterface|int|float|string|null $date): bool
  Is the given date in the same ISO week as the current date?
• DateFns::lastDayOfISOWeek(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the last day of an ISO week for the given date.
• DateFns::setISOWeek(DateTimeInterface|int|float|string|null $date, int $week): DateTimeImmutable
  Set the ISO week to the given date.
• DateFns::startOfISOWeek(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the start of an ISO week for the given date.

Month Helpers

• DateFns::addMonths(DateTimeInterface|int|float|string|null $date, int $amount): DateTimeImmutable
  Add the specified number of months to the given date.
• DateFns::differenceInCalendarMonths(DateTimeInterface|int|float|string|null $laterDate, DateTimeInterface|int|float|string|null $earlierDate): int
  Get the number of calendar months between the given dates.
• DateFns::differenceInMonths(DateTimeInterface|int|float|string|null $laterDate, DateTimeInterface|int|float|string|null $earlierDate): int
  Get the number of full months between the given dates.
• DateFns::eachWeekendOfMonth(DateTimeInterface|int|float|string|null $date): array
  List all the Saturdays and Sundays in the given month.
• DateFns::endOfMonth(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the end of a month for the given date.
• DateFns::getDaysInMonth(DateTimeInterface|int|float|string|null $date): int
  Get the number of days in a month of the given date.
• DateFns::getMonth(DateTimeInterface|int|float|string|null $date): int
  Get the month of the given date.
• DateFns::isFirstDayOfMonth(DateTimeInterface|int|float|string|null $date): bool
  Is the given date the first day of a month?
• DateFns::isLastDayOfMonth(DateTimeInterface|int|float|string|null $date): bool
  Is the given date the last day of a month?
• DateFns::isSameMonth(DateTimeInterface|int|float|string|null $dateLeft, DateTimeInterface|int|float|string|null $dateRight): bool
  Are the given dates in the same month (and year)?
• DateFns::isThisMonth(DateTimeInterface|int|float|string|null $date): bool
  Is the given date in the same month as the current date?
• DateFns::lastDayOfMonth(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the last day of a month for the given date.
• DateFns::setMonth(DateTimeInterface|int|float|string|null $date, int $month): DateTimeImmutable
  Set the month to the given date.
• DateFns::startOfMonth(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the start of a month for the given date.
• DateFns::subMonths(DateTimeInterface|int|float|string|null $date, int $amount): DateTimeImmutable
  Subtract the specified number of months from the given date.

Quarter Helpers

• DateFns::addQuarters(DateTimeInterface|int|float|string|null $date, int $amount): DateTimeImmutable
  Add the specified number of year quarters to the given date.
• DateFns::differenceInCalendarQuarters(DateTimeInterface|int|float|string|null $laterDate, DateTimeInterface|int|float|string|null $earlierDate): int
  Get the number of calendar quarters between the given dates.
• DateFns::differenceInQuarters(DateTimeInterface|int|float|string|null $laterDate, DateTimeInterface|int|float|string|null $earlierDate, array $options = []): int
  Get the number of quarters between the given dates.
• DateFns::endOfQuarter(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the end of a year quarter for the given date.
• DateFns::getQuarter(DateTimeInterface|int|float|string|null $date): int
  Get the year quarter of the given date.
• DateFns::isSameQuarter(DateTimeInterface|int|float|string|null $dateLeft, DateTimeInterface|int|float|string|null $dateRight): bool
  Are the given dates in the same quarter (and year)?
• DateFns::isThisQuarter(DateTimeInterface|int|float|string|null $date): bool
  Is the given date in the same quarter as the current date?
• DateFns::lastDayOfQuarter(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the last day of a year quarter for the given date.
• DateFns::setQuarter(DateTimeInterface|int|float|string|null $date, int $quarter): DateTimeImmutable
  Set the year quarter to the given date.
• DateFns::startOfQuarter(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the start of a year quarter for the given date.
• DateFns::subQuarters(DateTimeInterface|int|float|string|null $date, int $amount): DateTimeImmutable
  Subtract the specified number of year quarters from the given date.

Year Helpers

• DateFns::addYears(DateTimeInterface|int|float|string|null $date, int $amount): DateTimeImmutable
  Add the specified number of years to the given date.
• DateFns::differenceInCalendarYears(DateTimeInterface|int|float|string|null $laterDate, DateTimeInterface|int|float|string|null $earlierDate): int
  Get the number of calendar years between the given dates.
• DateFns::differenceInYears(DateTimeInterface|int|float|string|null $laterDate, DateTimeInterface|int|float|string|null $earlierDate): int
  Get the number of full years between the given dates.
• DateFns::eachWeekendOfYear(DateTimeInterface|int|float|string|null $date): array
  List all the Saturdays and Sundays in the year.
• DateFns::endOfYear(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the end of a year for the given date.
• DateFns::getDaysInYear(DateTimeInterface|int|float|string|null $date): int
  Get the number of days in a year of the given date.
• DateFns::getYear(DateTimeInterface|int|float|string|null $date): int
  Get the year of the given date.
• DateFns::isLeapYear(DateTimeInterface|int|float|string|null $date): bool
  Is the given date in the leap year?
• DateFns::isSameYear(DateTimeInterface|int|float|string|null $dateLeft, DateTimeInterface|int|float|string|null $dateRight): bool
  Are the given dates in the same year?
• DateFns::isThisYear(DateTimeInterface|int|float|string|null $date): bool
  Is the given date in the same year as the current date?
• DateFns::lastDayOfYear(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the last day of a year for the given date.
• DateFns::setYear(DateTimeInterface|int|float|string|null $date, int $year): DateTimeImmutable
  Set the year to the given date.
• DateFns::startOfYear(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the start of a year for the given date.
• DateFns::subYears(DateTimeInterface|int|float|string|null $date, int $amount): DateTimeImmutable
  Subtract the specified number of years from the given date.

ISO Week-Numbering Year Helpers

• DateFns::addISOWeekYears(DateTimeInterface|int|float|string|null $date, int $amount): DateTimeImmutable
  Add the specified number of ISO week-numbering years to the given date.
• DateFns::differenceInCalendarISOWeekYears(DateTimeInterface|int|float|string|null $laterDate, DateTimeInterface|int|float|string|null $earlierDate): int
  Get the number of calendar ISO week-numbering years between the given dates.
• DateFns::differenceInISOWeekYears(DateTimeInterface|int|float|string|null $laterDate, DateTimeInterface|int|float|string|null $earlierDate): int
  Get the number of full ISO week-numbering years between the given dates.
• DateFns::endOfISOWeekYear(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the end of an ISO week-numbering year for the given date.
• DateFns::getISOWeeksInYear(DateTimeInterface|int|float|string|null $date): int
  Get the number of weeks in an ISO week-numbering year of the given date.
• DateFns::getISOWeekYear(DateTimeInterface|int|float|string|null $date): int
  Get the ISO week-numbering year of the given date.
• DateFns::isSameISOWeekYear(DateTimeInterface|int|float|string|null $dateLeft, DateTimeInterface|int|float|string|null $dateRight): bool
  Are the given dates in the same ISO week-numbering year?
• DateFns::lastDayOfISOWeekYear(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the last day of an ISO week-numbering year for the given date.
• DateFns::setISOWeekYear(DateTimeInterface|int|float|string|null $date, int $isoYear): DateTimeImmutable
  Set the ISO week-numbering year to the given date.
• DateFns::startOfISOWeekYear(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the start of an ISO week-numbering year for the given date.
• DateFns::subISOWeekYears(DateTimeInterface|int|float|string|null $date, int $amount): DateTimeImmutable
  Subtract the specified number of ISO week-numbering years from the given date.

Decade Helpers

• DateFns::endOfDecade(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the end of a decade for the given date.
• DateFns::getDecade(DateTimeInterface|int|float|string|null $date): int
  Get the decade of the given date.
• DateFns::lastDayOfDecade(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the last day of a decade for the given date.
• DateFns::startOfDecade(DateTimeInterface|int|float|string|null $date): DateTimeImmutable
  Return the start of a decade for the given date.

Generic Helpers

• DateFns::constructFrom($referenceDate, $value): DateTimeImmutable|DateTimeInterface
  Constructs a date using the reference date and the value
• DateFns::constructNow($referenceDate): DateTimeImmutable|DateTime
  Constructs a new current date using the passed value constructor.
• DateFns::transpose(DateTimeInterface $date, $constructor): DateTimeInterface
  Transpose the date to the given constructor.