PHP's strtotime in JavaScript

Here’s what our current JavaScript equivalent to PHP's strtotime looks like.

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module.exports = function strtotime (text, now) {
// discuss at: http://locutus.io/php/strtotime/
// original by: Caio Ariede (http://caioariede.com)
// improved by: Kevin van Zonneveld (http://kvz.io)
// improved by: Caio Ariede (http://caioariede.com)
// improved by: A. Matías Quezada (http://amatiasq.com)
// improved by: preuter
// improved by: Brett Zamir (http://brett-zamir.me)
// improved by: Mirko Faber
// input by: David
// bugfixed by: Wagner B. Soares
// bugfixed by: Artur Tchernychev
// bugfixed by: Stephan Bösch-Plepelits (http://github.com/plepe)
// note 1: Examples all have a fixed timestamp to prevent
// note 1: tests to fail because of variable time(zones)
// example 1: strtotime('+1 day', 1129633200)
// returns 1: 1129719600
// example 2: strtotime('+1 week 2 days 4 hours 2 seconds', 1129633200)
// returns 2: 1130425202
// example 3: strtotime('last month', 1129633200)
// returns 3: 1127041200
// example 4: strtotime('2009-05-04 08:30:00 GMT')
// returns 4: 1241425800
// example 5: strtotime('2009-05-04 08:30:00+00')
// returns 5: 1241425800
// example 6: strtotime('2009-05-04 08:30:00+02:00')
// returns 6: 1241418600
// example 7: strtotime('2009-05-04T08:30:00Z')
// returns 7: 1241425800
var parsed
var match
var today
var year
var date
var days
var ranges
var len
var times
var regex
var i
var fail = false
if (!text) {
return fail
}
// Unecessary spaces
text = text.replace(/^\s+|\s+$/g, '')
.replace(/\s{2,}/g, ' ')
.replace(/[\t\r\n]/g, '')
.toLowerCase()
// in contrast to php, js Date.parse function interprets:
// dates given as yyyy-mm-dd as in timezone: UTC,
// dates with "." or "-" as MDY instead of DMY
// dates with two-digit years differently
// etc...etc...
// ...therefore we manually parse lots of common date formats
var pattern = new RegExp([
'^(\\d{1,4})',
'([\\-\\.\\/:])',
'(\\d{1,2})',
'([\\-\\.\\/:])',
'(\\d{1,4})',
'(?:\\s(\\d{1,2}):(\\d{2})?:?(\\d{2})?)?',
'(?:\\s([A-Z]+)?)?$'
].join(''))
match = text.match(pattern)
if (match && match[2] === match[4]) {
if (match[1] > 1901) {
switch (match[2]) {
case '-':
// YYYY-M-D
if (match[3] > 12 || match[5] > 31) {
return fail
}
return new Date(match[1], parseInt(match[3], 10) - 1, match[5],
match[6] || 0, match[7] || 0, match[8] || 0, match[9] || 0) / 1000
case '.':
// YYYY.M.D is not parsed by strtotime()
return fail
case '/':
// YYYY/M/D
if (match[3] > 12 || match[5] > 31) {
return fail
}
return new Date(match[1], parseInt(match[3], 10) - 1, match[5],
match[6] || 0, match[7] || 0, match[8] || 0, match[9] || 0) / 1000
}
} else if (match[5] > 1901) {
switch (match[2]) {
case '-':
// D-M-YYYY
if (match[3] > 12 || match[1] > 31) {
return fail
}
return new Date(match[5], parseInt(match[3], 10) - 1, match[1],
match[6] || 0, match[7] || 0, match[8] || 0, match[9] || 0) / 1000
case '.':
// D.M.YYYY
if (match[3] > 12 || match[1] > 31) {
return fail
}
return new Date(match[5], parseInt(match[3], 10) - 1, match[1],
match[6] || 0, match[7] || 0, match[8] || 0, match[9] || 0) / 1000
case '/':
// M/D/YYYY
if (match[1] > 12 || match[3] > 31) {
return fail
}
return new Date(match[5], parseInt(match[1], 10) - 1, match[3],
match[6] || 0, match[7] || 0, match[8] || 0, match[9] || 0) / 1000
}
} else {
switch (match[2]) {
case '-':
// YY-M-D
if (match[3] > 12 || match[5] > 31 || (match[1] < 70 && match[1] > 38)) {
return fail
}
year = match[1] >= 0 && match[1] <= 38 ? +match[1] + 2000 : match[1]
return new Date(year, parseInt(match[3], 10) - 1, match[5],
match[6] || 0, match[7] || 0, match[8] || 0, match[9] || 0) / 1000
case '.':
// D.M.YY or H.MM.SS
if (match[5] >= 70) {
// D.M.YY
if (match[3] > 12 || match[1] > 31) {
return fail
}
return new Date(match[5], parseInt(match[3], 10) - 1, match[1],
match[6] || 0, match[7] || 0, match[8] || 0, match[9] || 0) / 1000
}
if (match[5] < 60 && !match[6]) {
// H.MM.SS
if (match[1] > 23 || match[3] > 59) {
return fail
}
today = new Date()
return new Date(today.getFullYear(), today.getMonth(), today.getDate(),
match[1] || 0, match[3] || 0, match[5] || 0, match[9] || 0) / 1000
}
// invalid format, cannot be parsed
return fail
case '/':
// M/D/YY
if (match[1] > 12 || match[3] > 31 || (match[5] < 70 && match[5] > 38)) {
return fail
}
year = match[5] >= 0 && match[5] <= 38 ? +match[5] + 2000 : match[5]
return new Date(year, parseInt(match[1], 10) - 1, match[3],
match[6] || 0, match[7] || 0, match[8] || 0, match[9] || 0) / 1000
case ':':
// HH:MM:SS
if (match[1] > 23 || match[3] > 59 || match[5] > 59) {
return fail
}
today = new Date()
return new Date(today.getFullYear(), today.getMonth(), today.getDate(),
match[1] || 0, match[3] || 0, match[5] || 0) / 1000
}
}
}
// other formats and "now" should be parsed by Date.parse()
if (text === 'now') {
return now === null || isNaN(now)
? new Date().getTime() / 1000 | 0
: now | 0
}
if (!isNaN(parsed = Date.parse(text))) {
return parsed / 1000 | 0
}
// Browsers !== Chrome have problems parsing ISO 8601 date strings, as they do
// not accept lower case characters, space, or shortened time zones.
// Therefore, fix these problems and try again.
// Examples:
// 2015-04-15 20:33:59+02
// 2015-04-15 20:33:59z
// 2015-04-15t20:33:59+02:00
pattern = new RegExp([
'^([0-9]{4}-[0-9]{2}-[0-9]{2})',
'[ t]',
'([0-9]{2}:[0-9]{2}:[0-9]{2}(\\.[0-9]+)?)',
'([\\+-][0-9]{2}(:[0-9]{2})?|z)'
].join(''))
match = text.match(pattern)
if (match) {
// @todo: time zone information
if (match[4] === 'z') {
match[4] = 'Z'
} else if (match[4].match(/^([+-][0-9]{2})$/)) {
match[4] = match[4] + ':00'
}
if (!isNaN(parsed = Date.parse(match[1] + 'T' + match[2] + match[4]))) {
return parsed / 1000 | 0
}
}
date = now ? new Date(now * 1000) : new Date()
days = {
'sun': 0,
'mon': 1,
'tue': 2,
'wed': 3,
'thu': 4,
'fri': 5,
'sat': 6
}
ranges = {
'yea': 'FullYear',
'mon': 'Month',
'day': 'Date',
'hou': 'Hours',
'min': 'Minutes',
'sec': 'Seconds'
}
function lastNext (type, range, modifier) {
var diff
var day = days[range]
if (typeof day !== 'undefined') {
diff = day - date.getDay()
if (diff === 0) {
diff = 7 * modifier
} else if (diff > 0 && type === 'last') {
diff -= 7
} else if (diff < 0 && type === 'next') {
diff += 7
}
date.setDate(date.getDate() + diff)
}
}
function process (val) {
// @todo: Reconcile this with regex using \s, taking into account
// browser issues with split and regexes
var splt = val.split(' ')
var type = splt[0]
var range = splt[1].substring(0, 3)
var typeIsNumber = /\d+/.test(type)
var ago = splt[2] === 'ago'
var num = (type === 'last' ? -1 : 1) * (ago ? -1 : 1)
if (typeIsNumber) {
num *= parseInt(type, 10)
}
if (ranges.hasOwnProperty(range) && !splt[1].match(/^mon(day|\.)?$/i)) {
return date['set' + ranges[range]](date['get' + ranges[range]]() + num)
}
if (range === 'wee') {
return date.setDate(date.getDate() + (num * 7))
}
if (type === 'next' || type === 'last') {
lastNext(type, range, num)
} else if (!typeIsNumber) {
return false
}
return true
}
times = '(years?|months?|weeks?|days?|hours?|minutes?|min|seconds?|sec' +
'|sunday|sun\\.?|monday|mon\\.?|tuesday|tue\\.?|wednesday|wed\\.?' +
'|thursday|thu\\.?|friday|fri\\.?|saturday|sat\\.?)'
regex = '([+-]?\\d+\\s' + times + '|' + '(last|next)\\s' + times + ')(\\sago)?'
match = text.match(new RegExp(regex, 'gi'))
if (!match) {
return fail
}
for (i = 0, len = match.length; i < len; i++) {
if (!process(match[i])) {
return fail
}
}
return (date.getTime() / 1000)
}
[ View on GitHub | Edit on GitHub | Source on GitHub ]

How to use

You you can install via npm install locutus and require it via require('locutus/php/datetime/strtotime'). You could also require the datetime module in full so that you could access datetime.strtotime instead.

If you intend to target the browser, you can then use a module bundler such as Browserify, webpack or rollup.js.

ES5/ES6

This function targets ES5, but as of Locutus 2.0.2 we also support ES6 functions. Locutus transpiles to ES5 before publishing to npm.

A community effort

Not unlike Wikipedia, Locutus is an ongoing community effort. Our philosophy follows The McDonald’s Theory. This means that we don't consider it to be a bad thing that many of our functions are first iterations, which may still have their fair share of issues. We hope that these flaws will inspire others to come up with better ideas.

This way of working also means that we don't offer any production guarantees, and recommend to use Locutus inspiration and learning purposes only.

Notes

  • Examples all have a fixed timestamp to prevent tests to fail because of variable time(zones)

Examples

Please note that these examples are distilled from test cases that automatically verify our functions still work correctly. This could explain some quirky ones.

#codeexpected result
1strtotime('+1 day', 1129633200)1129719600
2strtotime('+1 week 2 days 4 hours 2 seconds', 1129633200)1130425202
3strtotime('last month', 1129633200)1127041200
4strtotime('2009-05-04 08:30:00 GMT')1241425800
5strtotime('2009-05-04 08:30:00+00')1241425800
6strtotime('2009-05-04 08:30:00+02:00')1241418600
7strtotime('2009-05-04T08:30:00Z')1241425800

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