var d = new Date("Sun May 1,2014"); var year = d.getFullYear(); var month = d.getMonth() + 1; var day = d.getDate(); month = checkZero(month); day = checkZero(day); var date = ""; date += year; date += "-"; date += month; date += "-"; date += day; document.querySelector("#display").innerHTML = date; function checkZero(i) { if (i < 10) { i = "0" + i }; // add zero in front of numbers < 10 return i; } <div id="display"></div>

当ES2018滚动时(在chrome中工作)，你可以简单地正则化它

(new Date())
    .toISOString()
    .replace(
        /^(?<year>\d+)-(?<month>\d+)-(?<day>\d+)T.*$/,
        '$<year>-$<month>-$<day>'
    )

2020-07-14

或者如果你想要一些非常多功能，没有任何库

(new Date())
    .toISOString()
    .match(
        /^(?<yyyy>\d\d(?<yy>\d\d))-(?<mm>0?(?<m>\d+))-(?<dd>0?(?<d>\d+))T(?<HH>0?(?<H>\d+)):(?<MM>0?(?<M>\d+)):(?<SSS>(?<SS>0?(?<S>\d+))\.\d+)(?<timezone>[A-Z][\dA-Z.-:]*)$/
    )
    .groups

哪一个结果提取了以下内容

{
    H: "8"
    HH: "08"
    M: "45"
    MM: "45"
    S: "42"
    SS: "42"
    SSS: "42.855"
    d: "14"
    dd: "14"
    m: "7"
    mm: "07"
    timezone: "Z"
    yy: "20"
    yyyy: "2020"
}

你可以像这样用replace(…, < d > / < m > /美元\ ' < yy > @ < H >:美元$ < MM > '),在顶部,而不是.match(…)。群体

14/7/'20 @ 8:45

你可以在Date对象上使用toLocaleDateString('fr-CA')

console.log（new Date（'Sun May 11，2014'）.toLocaleDateString（'fr-CA'））;

我还发现，这些地区给正确的结果从这个地区列表所有地区和他们的短代码列表?

'en-CA'
'fr-CA'
'lt-LT'
'sv-FI'
'sv-SE'

var localesList = ["af-ZA", "am-ET", "ar-AE", "ar-BH", "ar-DZ", "ar-EG", "ar-IQ", "ar-JO", "ar-KW", "ar-LB", "ar-LY", "ar-MA", "arn-CL", "ar-OM", "ar-QA", "ar-SA", "ar-SY", "ar-TN", "ar-YE", "as-IN", "az-Cyrl-AZ", "az-Latn-AZ", "ba-RU", "be-BY", "bg-BG", "bn-BD", "bn-IN", "bo-CN", "br-FR", "bs-Cyrl-BA", "bs-Latn-BA", "ca-ES", "co-FR", "cs-CZ", "cy-GB", "da-DK", "de-AT", "de-CH", "de-DE", "de-LI", "de-LU", "dsb-DE", "dv-MV", "el-GR", "en-029", "en-AU", "en-BZ", "en-CA", "en-GB", "en-IE", "en-IN", "en-JM", "en-MY", "en-NZ", "en-PH", "en-SG", "en-TT", "en-US", "en-ZA", "en-ZW", "es-AR", "es-BO", "es-CL", "es-CO", "es-CR", "es-DO", "es-EC", "es-ES", "es-GT", "es-HN", "es-MX", "es-NI", "es-PA", "es-PE", "es-PR", "es-PY", "es-SV", "es-US", "es-UY", "es-VE", "et-EE", "eu-ES", "fa-IR", "fi-FI", "fil-PH", "fo-FO", "fr-BE", "fr-CA", "fr-CH", "fr-FR", "fr-LU", "fr-MC", "fy-NL", "ga-IE", "gd-GB", "gl-ES", "gsw-FR", "gu-IN", "ha-Latn-NG", "he-IL", "hi-IN", "hr-BA", "hr-HR", "hsb-DE", "hu-HU", "hy-AM", "id-ID", "ig-NG", "ii-CN", "is-IS", "it-CH", "it-IT", "iu-Cans-CA", "iu-Latn-CA", "ja-JP", "ka-GE", "kk-KZ", "kl-GL", "km-KH", "kn-IN", "kok-IN", "ko-KR", "ky-KG", "lb-LU", "lo-LA", "lt-LT", "lv-LV", "mi-NZ", "mk-MK", "ml-IN", "mn-MN", "mn-Mong-CN", "moh-CA", "mr-IN", "ms-BN", "ms-MY", "mt-MT", "nb-NO", "ne-NP", "nl-BE", "nl-NL", "nn-NO", "nso-ZA", "oc-FR", "or-IN", "pa-IN", "pl-PL", "prs-AF", "ps-AF", "pt-BR", "pt-PT", "qut-GT", "quz-BO", "quz-EC", "quz-PE", "rm-CH", "ro-RO", "ru-RU", "rw-RW", "sah-RU", "sa-IN", "se-FI", "se-NO", "se-SE", "si-LK", "sk-SK", "sl-SI", "sma-NO", "sma-SE", "smj-NO", "smj-SE", "smn-FI", "sms-FI", "sq-AL", "sr-Cyrl-BA", "sr-Cyrl-CS", "sr-Cyrl-ME", "sr-Cyrl-RS", "sr-Latn-BA", "sr-Latn-CS", "sr-Latn-ME", "sr-Latn-RS", "sv-FI", "sv-SE", "sw-KE", "syr-SY", "ta-IN", "te-IN", "tg-Cyrl-TJ", "th-TH", "tk-TM", "tn-ZA", "tr-TR", "tt-RU", "tzm-Latn-DZ", "ug-CN", "uk-UA", "ur-PK", "uz-Cyrl-UZ", "uz-Latn-UZ", "vi-VN", "wo-SN", "xh-ZA", "yo-NG", "zh-CN", "zh-HK", "zh-MO", "zh-SG", "zh-TW", "zu-ZA" ]; localesList.forEach(lcl => { if ("2014-05-11" === new Date('Sun May 11,2014').toLocaleDateString(lcl)) { console.log(lcl, new Date('Sun May 11,2014').toLocaleDateString(lcl)); } });

不需要库

纯JavaScript。

下面的例子是从今天开始的两个月:

var d = new Date() d.setMonth(d.getMonth() - 2); var dateString =新的日期(d); console.log('格式化前'，dateString， '格式化后'，dateString. toisostring ().slice(0,10))

Date.js很适合这个。

require("datejs")
(new Date()).toString("yyyy-MM-dd")

将日期转换为yyyy-mm-dd格式的最简单方法是这样做:

var date = new Date("Sun May 11,2014");
var dateString = new Date(date.getTime() - (date.getTimezoneOffset() * 60000 ))
                    .toISOString()
                    .split("T")[0];

工作原理:

new Date("Sun May 11,2014") converts the string "Sun May 11,2014" to a date object that represents the time Sun May 11 2014 00:00:00 in a timezone based on current locale (host system settings) new Date(date.getTime() - (date.getTimezoneOffset() * 60000 )) converts your date to a date object that corresponds with the time Sun May 11 2014 00:00:00 in UTC (standard time) by subtracting the time zone offset .toISOString() converts the date object to an ISO 8601 string 2014-05-11T00:00:00.000Z .split("T") splits the string to array ["2014-05-11", "00:00:00.000Z"] [0] takes the first element of that array

Demo

var date =新日期(“太阳5月11日”); var dateString =新日期(日期。 toISOString()。 斯普利特(“T”)[0]; 游戏机。log (dateString);

注意:

The first part of the code (new Date(...)) may need to be tweaked a bit if your input format is different from that of the OP. As mikeypie pointed out in the comments, if the date string is already in the expected output format and the local timezone is west of UTC, then new Date('2022-05-18') results in 2022-05-17. And a user's locale (eg. MM/DD/YYYY vs DD-MM-YYYY) may also impact how a date is parsed by new Date(...). So do some proper testing if you want to use this code for different input formats.