This change log lists pre-release versions and changes made since v2.0.0-alpha.1.

• BREAKING: Replace export = with export default in TypeScript definitions.

• Remove v2 notice shown at postinstall.
• Catalan (ca) locale spelling errors and update following official grammatical rules. Thanks to @avizcaino!
• Improved performance of addBusinessDays and differenceInBusinessDays. Kudos to @RudyRed!

• Handle negative amount in addBusinessDays. Credits go to @RudyRed.

• Fix bug in differenceInBusinessDays. Thanks to @RudyRed.
• Fix TypeScript typings for curried functions. Kudos to @dkozickis.

• BREAKING: min & max functions now return Invalid Date for all invalid inputs. See PR and issue. Credits go to @diiorio.

• Update Croatian (hr) locale for v2. Thanks to @jerzabek.

• Add Welsh (Cymraeg) locale. Kudos to @elmomalmo!

• Update Georgian (ka) locale for v2. Thanks to @shvelo!

• Fix incorrect parsing of 24:00 in parseISO. See #1228.

• Fix bug when week year was used to parse Gregorian year and the Gregorian year was used to parse week year.

• The Czech locale was added to the locales index file so it could be imported as import { cs } from 'date-fns/locale'.

• BREAKING: stand-alone era token now parses as 1 BC and 1 AD instead of 10 BC and 10 AD.

• BREAKING: from now on parse validates the token string. Combinations that don't make sense or could lead to bugs are prohibited and will throw RangeError. For example usage of 24-hour format token with AM/PM token will throw an exception:

  parse('23 AM', 'HH a', new Date())
  //=> RangeError: The format string mustn't contain `HH` and `a` at the same time

  See the compatibility table: https://docs.google.com/spreadsheets/d/e/2PACX-1vQOPU3xUhplll6dyoMmVUXHKl_8CRDs6_ueLmex3SoqwhuolkuN3O05l4rqx5h1dKX8eb46Ul-CCSrq/pubhtml?gid=0&single=true

• Fix Czech (cs) locale:

  • Add months in genitive to format.

  • Add weekdays in accusative to formatRelative.

  • Enable the locale.

• Added @babel/plugin-transform-arrow-functions to the Babel plugins list. That fixed the problem with arrow functions in the Finnish locale that caused IE11 to throw Syntax Error.

• Added @babel/plugin-transform-template-literals to the Babel plugins list. That fixed the problem with template literals in the Polish locale that caused IE11 to throw Syntax Error.

• Fixed formatRelative in the Latvian locale.

• Remove outdated locales from the package. It allows importing locales dynamically.

• Updated Czech (cs) locale for v2. Thank you, @JozefBiros!

• Fix const usage that broke UglifyJS.

• Add constants that can be imported directly from date-fns or the submodule date-fns/constants:

  • maxTime

  • minTime

  Thanks to @cmatiello!

• Add p+ token support to parse function. Credits go to @ericreis.

• Add new function differenceInBusinessDays which calculates the difference in business days. Kudos to @ThorrStevens!

• Add new function addBusinessDays, similar to addDays but ignoring weekends. Thanks to @ThorrStevens!

• Restore now-dependent functions that initially were removed in v2:

  • formatDistanceToNow
  • isFuture
  • isPast
  • endOfToday
  • endOfTomorrow
  • endOfYesterday
  • startOfToday
  • startOfTomorrow
  • startOfYesterday
  • isToday
  • isTomorrow
  • isYesterday
  • isThisSecond
  • isThisMinute
  • isThisHour
  • isThisWeek
  • isThisISOWeek
  • isThisMonth
  • isThisQuarter
  • isThisYear
  • isThisISOYear

• Enable updated locales that we forgot to remove from the outdated locales list:
  • Arabic locale (Modern Standard Arabic; ar-DZ),
  • Turkish locale (tk),
  • Indonesian locale (id),
  • Belarusian locale (be),
  • Finnish locale (fi),
  • Icelandic locale (is),
  • Romanian locale (ro),
  • Slovak locale (sk),
  • Thai locale (th).

• Fix exception in parseISO when the passed string contains a colon. Kudos to @stefanprobst.

• Add locale to options definition to all functions that accept weekStartsOn (see #1159).

• BREAKING: format, lightFormat and parse now will throw a RangeError exception if format string contains an unescaped latin character that isn't a valid formatting token.

  format(new Date(), 'nnnn-MM-dd')
  //=> RangeError: Format string contains an unescaped latin alphabet character `n`

• BREAKING: Temporary awareOfUnicodeTokens option is removed from format and parse. It is replaced with options useAdditionalWeekYearTokens for unlocking YY and YYYY tokens and useAdditionalDayOfYearTokens for D and DD.

  format(new Date(), 'YY', { useAdditionalWeekYearTokens: true })
  //=> '86'
  
  format(new Date(), 'D', { useAdditionalDayOfYearTokens: true })
  //=> '364'

• BREAKING: Treat invalid time as Invalid Date in parseISO. Kudos to @stefanprobst.

• Updated formatLong for de locale to follow DIN 5008. Kudos to @saithis.

• Improve Japanese translation of formatRelative (see #1097). Thanks to @ta-kiyama.

• Fix short date format for Swedish locale. Credits go to @Neorth

• Improve Brazilian Portuguese locale by @TatiTheFreaK.

• Improve Japanese translation of formatDistance with addSuffix option. Kudos to @kudohamu!

• Improve ordinalNumber function for Chinese (zh-CN) locale. Thanks to @cubicwork!

• Add fraction of seconds support to lightFormat. Thanks to @waseemahmad31.

• Added nn locale. Credits go to @draperunner.

• Added lv locale. Kudos to @prudolfs.

• pl locale was updated for v2. Thanks to @Mutisz!

• ko locale was updated for v2. Kudos to @iamssen!

• zh-TW locale was updated for v2. Credits go to @jackhsu978!

• sk locale was updated for v2. Thank you, @mareksuscak!

• ar-DZ locale was updated for v2. Kudos to @elshahat!

• Added Persian (fa-IR) locale. Credits go to @mort3za!

• Turkish (tr) locale was updated for v2. Thanks to group effort of @berkaey, @ikayar and @dbtek!

• Danish (da) locale was updated for v2. Kudos to @MathiasKandelborg!

• Belarusian (be) locale was updated for v2. Kudos to @alyrik!

• Catalan (ca) locale was updated for v2. Credits go to @avizcaino!

• Added Uighur locale (ug). Thanks to @abduwaly!

• Generate typings for step option of eachDayOfInterval introduced in v2.0.0-alpha.26
• Fix milliseconds aren't being detected after seconds/Unix timestamp.
• Fixed DST issue in eachDayOfInterval that caused time in the days after DST change to have the shift as well.
• Fix bug in Galician locale caused by incorrect usage of getHours instead of getUTCHours.

• Build-efficient lightFormat that only supports the popular subset of tokens. See #1050.
• parseISO function that parses ISO 8601 strings. See #1023.
• is locale is updated for v2 format. Kudos to @lamayg.
• pt locale is updated for v2 format. Kudos to @adrm.

• BREAKING: now functions don't accept string arguments, but only numbers or dates. When a string is passed, it will result in an unexpected result (Invalid Date, NaN, etc).

  From now on a string should be parsed using parseISO (ISO 8601) or parse.

  In v1 we've used new Date() to parse strings, but it resulted in many hard-to-track bugs caused by inconsistencies in different browsers. To address that we've implemented our ISO 8601 parser but that made library to significantly grow in size. To prevent inevitable bugs and keep the library tiny, we made this trade-off.

  See this post for more details.

  // Before
  addDays('2016-01-01', 1)
  
  // After
  addDays(parseISO('2016-01-01'), 1)

• BREAKING: format, formatDistance and formatDistanceStrict now throw RangeError if one the passed arguments is invalid. It reflects behavior of toISOString and Intl API. See #1032.

• BREAKING: nearestTo moved from argument to options in roundToNearestMinutes.

• Update zh-CN locale to match the nation standard (GB/T 7408-2005). Kudos to @cubicwork!

• Fixed DST issue. See #972 and #992 for more details.
• Fixed grammar issue in the HU locale. See #1001 for more details. Kudos to @TwoDCube!
• Fixed typo in defaultFormattingWidth that spread to a bunch of locales and caused I18n code to ignore this parameter. See #989. Kudos to @jsoref

• id locale was updated for v2. Credits go to @Imballinst!
• ro locale was updated for v2. Kudos to @aocneanu and @gandesc!
• Add step option to eachDayOfInterval initially introduced in v1 branch (#487).

• Updated Swedish locale to better reflect how relative weekdays are spoken in Swedish. Thanks to @Neorth!

• New interval, month, and year helpers to fetch a list of all Saturdays and Sundays (weekends) for a given date interval. eachWeekendOfInterval is the handler function while the other two are wrapper functions. Kudos to @laekettavong!
  • eachWeekendOfInterval
  • eachWeekendOfMonth
  • eachWeekendOfYear

• Fixed pt-BR translation. Kudos to @wregis!
• Removed ES6 'const' from bn locale. Thanks to @charliedavison.
• Fixed error in the getUnixTime docs. Kudos to @xkizer.

• Added ar-SA locale. Credits go to @dalwadani.
• Added new function fromUnixTime. Thansk to @xkizer.

• Fix usage of const causing UglifyJS fail on date-fns. See #933

• New roundToNearestMinutes function. Kudos to @xkizer.

• gl locale. Thanks to @cocodinTech and @fidelpita.

• et locale was updated for v2. Kudos to @priithansen again!

• el locale was updated for v2. Credits go to @fanixk!

• BREAKING: To use D, DD, YY, YYYY tokens now you should set awareOfUnicodeTokens:

  format(Date.now(), 'YY', { awareOfUnicodeTokens: true })
  //=> '86'

  See: https://git.io/fxCyr

• Updated Afrikaans locale for v2. Kudos to @marnusw!

• Approach to ECMAScript was reworked.

  Previously to use ECMAScript Modules, you always had to import it from esm submodule to enable tree-shaking:

  import { format } from 'date-fns/esm'
  import parse from 'date-fns/esm/parse'
  import { eo } from 'date-fns/esm/locale'
  import { addDays } from 'date-fns/esm/fp'

  From now on you can use it without esm:

  import { format } from 'date-fns'
  import parse from 'date-fns/parse'
  import { eo } from 'date-fns/locale'
  import { addDays } from 'date-fns/fp'

• ja locale was improved and updated for v2. Kudos to @ciscorn and @kudohamu!

• Fixed formatRelative in the Spanish locale.
• Fixed ordinalnumber in the French locale. Kudos to @Lakston.

• Added getUnixTime function. Kudos to @Kingwl.

• New decade helpers. Thanks to @y-nk!

  • getDecade

  • startOfDecade

  • endOfDecade

  • lastDayOfDecade

• Exclude docs.json from the npm package. Kudos to @hawkrives.

⚠️ The release got failed.

• he locale is updated for v2 format. Kudos to @Nirlah.

• hu and lt locales. Thanks to @izifortune and pardoeryanair

• bn locale. Kudos to @nutboltu and @touhidrahman.

• it locale is updated for v2 format. Thanks to @vin-car

• vi locale is updated for v2 format. Kudos to @lihop and @trongthanh.

• fi locale is updated for v2 format. Kudos to @sjuvonen.

⚠️ The release got failed.

• th locale is updated for v2 format. Kudos to @nodtem66.

• PR #823. Changes to the following locales:

  • de
  • es
  • fr
  • nb
  • nl
  • pt-BR
  • ru
  • sv
  • th
  • uk
  • zh-CN

  to fix bugs uncovered by recent change in parse behavior introduced by PR #821.

• BREAKING: In parse, return Invalid Date if there is any remaining non-whitespace input. See issue #819

• Export nl locale in date-fns/locale/index.js

• BREAKING: parse now validates separate date and time values, and prevents nonexistent dates.

  parse('13/32/2018', 'MM/dd/yyyy', new Date())
  //=> Invalid Date

• nl locale is updated for v2 format. Thanks to the teamwork of @curry684 and @stefanvermaas!

• Fix the format of abbreviated months in German locale. See PR #817 and commit ff33cc8. Kudos to @Philipp91

• BREAKING: toDate now validates separate date and time values in ISO-8601 strings and returns Invalid Date if the date is invalid.

  toDate('2018-13-32')
  //=> Invalid Date

• es locale is updated for v2 format. Kudos to @YagoCarballo.

• pt-BR locale is updated for v2 format. Thanks to @YagoCarballo again!

• Fix spelling of month in Swedish locale. See PR #801. Thanks to @limelights

• fr locale is updated for v2 format. Kudos to @Lakston.
• zh-CN locale is updated for v2 format. Kudos to @cubicwork.
• Added eachWeekOfInterval, the weekly equivalent of eachDayOfInterval. Thanks to @xkizer

• Fix a few bugs that appear in timezones with offsets that include seconds (e.g. GMT+00:57:44). See PR #789.

• de locale is updated for v2 format. Kudos to @pex.
• uk locale is updated for v2 format. Kudos to @shcherbyakdev.
• BREAKING: Refine the way arguments are processed:

  • Convert number arguments into integer number using a custom toInteger implementation

  • Change null/undefined/true/false handling strategy:

    • For required arguments:

    	date	number	string	boolean
    0	new Date(0)	0	'0'	false
    '0'	Invalid Date	0	'0'	false
    1	new Date(1)	1	'1'	true
    '1'	Invalid Date	1	'1'	true
    true	Invalid Date	NaN	'true'	true
    false	Invalid Date	NaN	'false'	false
    null	Invalid Date	NaN	'null'	false
    undefined	Invalid Date	NaN	'undefined'	false
    NaN	Invalid Date	NaN	'NaN'	false

    • For optional arguments, null and undefined are treated as if argument is not provided

• isDate is added back. The new version of the function works correctly with dates passed across iframes.

• BREAKING: toDate now doesn't fall back to new Date constructor if it fails to parse a string argument. Instead, it returns Invalid Date.
• sv locale is updated for v2 format. Kudos to @alexandernanberg.
• nb locale is updated for v2 format. Kudos to @dagstuan.

• New locale-dependent week-numbering year helpers:

  • getWeek
  • getWeekYear
  • setWeek
  • setWeekYear
  • startOfWeekYear

• BREAKING: new API for locales. See docs/i18nContributionGuide.md for more details.

• BREAKING: temporary disable all locales except en-US, ru and eo. Most of the disabled locales will be enabled back until the release.

• BREAKING: new format string API for format function which is based on Unicode Technical Standard #35:

  Unit	Pattern	Result examples
  Era	G..GGG	AD, BC
  	GGGG	Anno Domini, Before Christ
  	GGGGG	A, B
  Calendar year	y	44, 1, 1900, 2017
  	yo	44th, 1st, 0th, 17th
  	yy	44, 01, 00, 17
  	yyy	044, 001, 1900, 2017
  	yyyy	0044, 0001, 1900, 2017
  	yyyyy	...
  Local week-numbering year	Y	44, 1, 1900, 2017
  	Yo	44th, 1st, 1900th, 2017th
  	YY	44, 01, 00, 17
  	YYY	044, 001, 1900, 2017
  	YYYY	0044, 0001, 1900, 2017
  	YYYYY	...
  ISO week-numbering year	R	-43, 0, 1, 1900, 2017
  	RR	-43, 00, 01, 1900, 2017
  	RRR	-043, 000, 001, 1900, 2017
  	RRRR	-0043, 0000, 0001, 1900, 2017
  	RRRRR	...
  Extended year	u	-43, 0, 1, 1900, 2017
  	uu	-43, 01, 1900, 2017
  	uuu	-043, 001, 1900, 2017
  	uuuu	-0043, 0001, 1900, 2017
  	uuuuu	...
  Quarter (formatting)	Q	1, 2, 3, 4
  	Qo	1st, 2nd, 3rd, 4th
  	QQ	01, 02, 03, 04
  	QQQ	Q1, Q2, Q3, Q4
  	QQQQ	1st quarter, 2nd quarter, ...
  	QQQQQ	1, 2, 3, 4
  Quarter (stand-alone)	q	1, 2, 3, 4
  	qo	1st, 2nd, 3rd, 4th
  	qq	01, 02, 03, 04
  	qqq	Q1, Q2, Q3, Q4
  	qqqq	1st quarter, 2nd quarter, ...
  	qqqqq	1, 2, 3, 4
  Month (formatting)	M	1, 2, ..., 12
  	Mo	1st, 2nd, ..., 12th
  	MM	01, 02, ..., 12
  	MMM	Jan, Feb, ..., Dec
  	MMMM	January, February, ..., December
  	MMMMM	J, F, ..., D
  Month (stand-alone)	L	1, 2, ..., 12
  	Lo	1st, 2nd, ..., 12th
  	LL	01, 02, ..., 12
  	LLL	Jan, Feb, ..., Dec
  	LLLL	January, February, ..., December
  	LLLLL	J, F, ..., D
  Local week of year	w	1, 2, ..., 53
  	wo	1st, 2nd, ..., 53th
  	ww	01, 02, ..., 53
  ISO week of year	I	1, 2, ..., 53
  	Io	1st, 2nd, ..., 53th
  	II	01, 02, ..., 53
  Day of month	d	1, 2, ..., 31
  	do	1st, 2nd, ..., 31st
  	dd	01, 02, ..., 31
  Day of year	D	1, 2, ..., 365, 366
  	Do	1st, 2nd, ..., 365th, 366th
  	DD	01, 02, ..., 365, 366
  	DDD	001, 002, ..., 365, 366
  	DDDD	...
  Day of week (formatting)	E..EEE	Mon, Tue, Wed, ..., Su
  	EEEE	Monday, Tuesday, ..., Sunday
  	EEEEE	M, T, W, T, F, S, S
  	EEEEEE	Mo, Tu, We, Th, Fr, Su, Sa
  ISO day of week (formatting)	i	1, 2, 3, ..., 7
  	io	1st, 2nd, ..., 7th
  	ii	01, 02, ..., 07
  	iii	Mon, Tue, Wed, ..., Su
  	iiii	Monday, Tuesday, ..., Sunday
  	iiiii	M, T, W, T, F, S, S
  	iiiiii	Mo, Tu, We, Th, Fr, Su, Sa
  Local day of week (formatting)	e	2, 3, 4, ..., 1
  	eo	2nd, 3rd, ..., 1st
  	ee	02, 03, ..., 01
  	eee	Mon, Tue, Wed, ..., Su
  	eeee	Monday, Tuesday, ..., Sunday
  	eeeee	M, T, W, T, F, S, S
  	eeeeee	Mo, Tu, We, Th, Fr, Su, Sa
  Local day of week (stand-alone)	c	2, 3, 4, ..., 1
  	co	2nd, 3rd, ..., 1st
  	cc	02, 03, ..., 01
  	ccc	Mon, Tue, Wed, ..., Su
  	cccc	Monday, Tuesday, ..., Sunday
  	ccccc	M, T, W, T, F, S, S
  	cccccc	Mo, Tu, We, Th, Fr, Su, Sa
  AM, PM	a..aaa	AM, PM
  	aaaa	a.m., p.m.
  	aaaaa	a, p
  AM, PM, noon, midnight	b..bbb	AM, PM, noon, midnight
  	bbbb	a.m., p.m., noon, midnight
  	bbbbb	a, p, n, mi
  Flexible day period	B..BBB	at night, in the morning, ...
  	BBBB	at night, in the morning, ...
  	BBBBB	at night, in the morning, ...
  Hour [1-12]	h	1, 2, ..., 11, 12
  	ho	1st, 2nd, ..., 11th, 12th
  	hh	01, 02, ..., 11, 12
  Hour [0-23]	H	0, 1, 2, ..., 23
  	Ho	0th, 1st, 2nd, ..., 23rd
  	HH	00, 01, 02, ..., 23
  Hour [0-11]	K	1, 2, ..., 11, 0
  	Ko	1st, 2nd, ..., 11th, 0th
  	KK	1, 2, ..., 11, 0
  Hour [1-24]	k	24, 1, 2, ..., 23
  	ko	24th, 1st, 2nd, ..., 23rd
  	kk	24, 01, 02, ..., 23
  Minute	m	0, 1, ..., 59
  	mo	0th, 1st, ..., 59th
  	mm	00, 01, ..., 59
  Second	s	0, 1, ..., 59
  	so	0th, 1st, ..., 59th
  	ss	00, 01, ..., 59
  Fraction of second	S	0, 1, ..., 9
  	SS	00, 01, ..., 99
  	SSS	000, 0001, ..., 999
  	SSSS	...
  Timezone (ISO-8601 w/ Z)	X	-08, +0530, Z
  	XX	-0800, +0530, Z
  	XXX	-08:00, +05:30, Z
  	XXXX	-0800, +0530, Z, +123456
  	XXXXX	-08:00, +05:30, Z, +12:34:56
  Timezone (ISO-8601 w/o Z)	x	-08, +0530, +00
  	xx	-0800, +0530, +0000
  	xxx	-08:00, +05:30, +00:00
  	xxxx	-0800, +0530, +0000, +123456
  	xxxxx	-08:00, +05:30, +00:00, +12:34:56
  Timezone (GMT)	O...OOO	GMT-8, GMT+5:30, GMT+0
  	OOOO	GMT-08:00, GMT+05:30, GMT+00:00
  Timezone (specific non-locat.)	z...zzz	GMT-8, GMT+5:30, GMT+0
  	zzzz	GMT-08:00, GMT+05:30, GMT+00:00
  Seconds timestamp	t	512969520
  	tt	...
  Milliseconds timestamp	T	512969520900
  	TT	...
  Long localized date	P	5/29/53
  	PP	May 29, 1453
  	PPP	May 29th, 1453
  	PPPP	Sunday, May 29th, 1453
  Long localized time	p	12:00 AM
  	pp	12:00:00 AM
  	ppp	12:00:00 AM GMT+2
  	pppp	12:00:00 AM GMT+02:00
  Combination of date and time	Pp	5/29/53, 12:00 AM
  	PPpp	May 29, 1453, 12:00 AM
  	PPPppp	May 29th, 1453 at ...
  	PPPPpppp	Sunday, May 29th, 1453 at ...

  Characters are now escaped using single quote symbols (') instead of square brackets.

• BREAKING: new format string API for parse function:

  Unit	Pattern	Result examples
  Era	G..GGG	AD, BC
  	GGGG	Anno Domini, Before Christ
  	GGGGG	A, B
  Calendar year	y	44, 1, 1900, 2017, 9999
  	yo	44th, 1st, 1900th, 9999999th
  	yy	44, 01, 00, 17
  	yyy	044, 001, 123, 999
  	yyyy	0044, 0001, 1900, 2017
  	yyyyy	...
  Local week-numbering year	Y	44, 1, 1900, 2017, 9000
  	Yo	44th, 1st, 1900th, 9999999th
  	YY	44, 01, 00, 17
  	YYY	044, 001, 123, 999
  	YYYY	0044, 0001, 1900, 2017
  	YYYYY	...
  ISO week-numbering year	R	-43, 1, 1900, 2017, 9999, -9999
  	RR	-43, 01, 00, 17
  	RRR	-043, 001, 123, 999, -999
  	RRRR	-0043, 0001, 2017, 9999, -9999
  	RRRRR	...
  Extended year	u	-43, 1, 1900, 2017, 9999, -999
  	uu	-43, 01, 99, -99
  	uuu	-043, 001, 123, 999, -999
  	uuuu	-0043, 0001, 2017, 9999, -9999
  	uuuuu	...
  Quarter (formatting)	Q	1, 2, 3, 4
  	Qo	1st, 2nd, 3rd, 4th
  	QQ	01, 02, 03, 04
  	QQQ	Q1, Q2, Q3, Q4
  	QQQQ	1st quarter, 2nd quarter, ...
  	QQQQQ	1, 2, 3, 4
  Quarter (stand-alone)	q	1, 2, 3, 4
  	qo	1st, 2nd, 3rd, 4th
  	qq	01, 02, 03, 04
  	qqq	Q1, Q2, Q3, Q4
  	qqqq	1st quarter, 2nd quarter, ...
  	qqqqq	1, 2, 3, 4
  Month (formatting)	M	1, 2, ..., 12
  	Mo	1st, 2nd, ..., 12th
  	MM	01, 02, ..., 12
  	MMM	Jan, Feb, ..., Dec
  	MMMM	January, February, ..., December
  	MMMMM	J, F, ..., D
  Month (stand-alone)	L	1, 2, ..., 12
  	Lo	1st, 2nd, ..., 12th
  	LL	01, 02, ..., 12
  	LLL	Jan, Feb, ..., Dec
  	LLLL	January, February, ..., December
  	LLLLL	J, F, ..., D
  Local week of year	w	1, 2, ..., 53
  	wo	1st, 2nd, ..., 53th
  	ww	01, 02, ..., 53
  ISO week of year	I	1, 2, ..., 53
  	Io	1st, 2nd, ..., 53th
  	II	01, 02, ..., 53
  Day of month	d	1, 2, ..., 31
  	do	1st, 2nd, ..., 31st
  	dd	01, 02, ..., 31
  Day of year	D	1, 2, ..., 365, 366
  	Do	1st, 2nd, ..., 365th, 366th
  	DD	01, 02, ..., 365, 366
  	DDD	001, 002, ..., 365, 366
  	DDDD	...
  Day of week (formatting)	E..EEE	Mon, Tue, Wed, ..., Su
  	EEEE	Monday, Tuesday, ..., Sunday
  	EEEEE	M, T, W, T, F, S, S
  	EEEEEE	Mo, Tu, We, Th, Fr, Su, Sa
  ISO day of week (formatting)	i	1, 2, 3, ..., 7
  	io	1st, 2nd, ..., 7th
  	ii	01, 02, ..., 07
  	iii	Mon, Tue, Wed, ..., Su
  	iiii	Monday, Tuesday, ..., Sunday
  	iiiii	M, T, W, T, F, S, S
  	iiiiii	Mo, Tu, We, Th, Fr, Su, Sa
  Local day of week (formatting)	e	2, 3, 4, ..., 1
  	eo	2nd, 3rd, ..., 1st
  	ee	02, 03, ..., 01
  	eee	Mon, Tue, Wed, ..., Su
  	eeee	Monday, Tuesday, ..., Sunday
  	eeeee	M, T, W, T, F, S, S
  	eeeeee	Mo, Tu, We, Th, Fr, Su, Sa
  Local day of week (stand-alone)	c	2, 3, 4, ..., 1
  	co	2nd, 3rd, ..., 1st
  	cc	02, 03, ..., 01
  	ccc	Mon, Tue, Wed, ..., Su
  	cccc	Monday, Tuesday, ..., Sunday
  	ccccc	M, T, W, T, F, S, S
  	cccccc	Mo, Tu, We, Th, Fr, Su, Sa
  AM, PM	a..aaa	AM, PM
  	aaaa	a.m., p.m.
  	aaaaa	a, p
  AM, PM, noon, midnight	b..bbb	AM, PM, noon, midnight
  	bbbb	a.m., p.m., noon, midnight
  	bbbbb	a, p, n, mi
  Flexible day period	B..BBB	at night, in the morning, ...
  	BBBB	at night, in the morning, ...
  	BBBBB	at night, in the morning, ...
  Hour [1-12]	h	1, 2, ..., 11, 12
  	ho	1st, 2nd, ..., 11th, 12th
  	hh	01, 02, ..., 11, 12
  Hour [0-23]	H	0, 1, 2, ..., 23
  	Ho	0th, 1st, 2nd, ..., 23rd
  	HH	00, 01, 02, ..., 23
  Hour [0-11]	K	1, 2, ..., 11, 0
  	Ko	1st, 2nd, ..., 11th, 0th
  	KK	1, 2, ..., 11, 0
  Hour [1-24]	k	24, 1, 2, ..., 23
  	ko	24th, 1st, 2nd, ..., 23rd
  	kk	24, 01, 02, ..., 23
  Minute	m	0, 1, ..., 59
  	mo	0th, 1st, ..., 59th
  	mm	00, 01, ..., 59
  Second	s	0, 1, ..., 59
  	so	0th, 1st, ..., 59th
  	ss	00, 01, ..., 59
  Fraction of second	S	0, 1, ..., 9
  	SS	00, 01, ..., 99
  	SSS	000, 0001, ..., 999
  	SSSS	...
  Timezone (ISO-8601 w/ Z)	X	-08, +0530, Z
  	XX	-0800, +0530, Z
  	XXX	-08:00, +05:30, Z
  	XXXX	-0800, +0530, Z, +123456
  	XXXXX	-08:00, +05:30, Z, +12:34:56
  Timezone (ISO-8601 w/o Z)	x	-08, +0530, +00
  	xx	-0800, +0530, +0000
  	xxx	-08:00, +05:30, +00:00
  	xxxx	-0800, +0530, +0000, +123456
  	xxxxx	-08:00, +05:30, +00:00, +12:34:56
  Seconds timestamp	t	512969520
  	tt	...
  Milliseconds timestamp	T	512969520900
  	TT	...

  Characters are now escaped using single quote symbols (') instead of square brackets.

• BREAKING: unit option in formatDistanceStrict function now takes one of the strings: 'second', 'minute', 'hour', 'day', 'month' or 'year' instead of 's', 'm', 'h', 'd', 'M' or 'Y'

• Fix the toDate bug occurring when parsing ISO-8601 style dates (but not valid ISO format) with a trailing Z (e.g 2012-01Z), it returned Invalid Date for FireFox/IE11 #510

• Fix differenceIn... functions returning negative zero in some cases: #692

• Support for long and relative formats for German locale (thanks to @vanvuongngo).

• fr-CH locale (kudos to @vanvuongngo).

• Support for long and relative formats for Swedish locale (thanks to @alexandernanberg).

v2.0.0-alpha.5 was incorrectly released, v2.0.0-alpha.6 fixes the problem.

• en-GB locale (kudos to @glintik)

• Flow typings for index.js, fp/index.js, locale/index.js, and their ESM equivalents. See PR #558

• Fixes danish locale support for long and relative formats (kudos to @stefanbugge)

• BREAKING: null now is not a valid date. isValid(null) returns false; toDate(null) returns an invalid date. Since toDate is used internally by all the functions, operations over null will also return an invalid date. See #537 for the reasoning.

• toDate (previously parse) and isValid functions now accept any type as the first argument.

• Fixes Spanish locale (kudos to @harogaston)

• Ukrainian locale (ua) (thanks to Andrii Korzh @korzhyk)

• Vietnamese locale (vi) (kudos to @trongthanh)

• BREAKING: all functions now check if the passed number of arguments is less than the number of required arguments and throw TypeError exception if so.