blocks|key|3011739|text|下面是一个简单的帮助器函数，它将为您格式化JS日期。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3011740|​|3011741|function+toIsoString(date)+{
++var+tzo+=+-date.getTimezoneOffset(),
++++++dif+=+tzo+>=+0+?+'%2B'+:+'-',
++++++pad+=+function(num)+{
++++++++++var+norm+=+Math.floor(Math.abs(num));
++++++++++return+(norm+<+10+?+'0'+:+'')+%2B+norm;
++++++};

++return+date.getFullYear()+%2B
++++++'-'+%2B+pad(date.getMonth()+%2B+1)+%2B
++++++'-'+%2B+pad(date.getDate())+%2B
++++++'T'+%2B+pad(date.getHours())+%2B
++++++':'+%2B+pad(date.getMinutes())+%2B
++++++':'+%2B+pad(date.getSeconds())+%2B
++++++dif+%2B+pad(tzo+/+60)+%2B
++++++':'+%2B+pad(tzo+%25+60);
}

var+dt+=+new+Date();
console.log(toIsoString(dt));|code-block|syntax|javascript|3011742|3011743|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|K|$]]

Here's a simple helper function that will format JS dates for you.
<div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>function toIsoString(date) {
 var tzo = -date.getTimezoneOffset(),
 dif = tzo &gt;= 0 ? '+' : '-',
 pad = function(num) {
 var norm = Math.floor(Math.abs(num));
 return (norm &lt; 10 ? '0' : '') + norm;
 };

 return date.getFullYear() +
 '-' + pad(date.getMonth() + 1) +
 '-' + pad(date.getDate()) +
 'T' + pad(date.getHours()) +
 ':' + pad(date.getMinutes()) +
 ':' + pad(date.getSeconds()) +
 dif + pad(tzo / 60) +
 ':' + pad(tzo % 60);
}

var dt = new Date();
console.log(toIsoString(dt));</code></pre>
</div>
</div>

blocks|key|182325|text|getTimezoneOffset()返回与参照的等级库所需格式相反的符号。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|182326|这种格式也称为ISO8601，或者更准确地说是RFC3339。|182327|在此格式中，UTC用Z表示，而所有其他格式都用UTC的偏移量表示。其含义与JavaScript相同，但减法顺序颠倒，因此结果带有相反的符号。|182328|此外，本机Date对象上没有名为format的方法，因此#1中的函数将失败，除非您使用库来实现此目的。请参阅this+documentation。|182329|如果您正在寻找可以直接使用此格式的库，我建议您尝试使用moment.js。实际上，这是默认格式，所以您可以简单地这样做：|182330|var+m+=+moment();++++//+get+"now"+as+a+moment
var+s+=+m.format();++//+the+ISO+format+is+the+default+so+no+parameters+are+needed

//+sample+output:+++2013-07-01T17:55:13-07:00|code-block|syntax|javascript|182331|这是一个经过良好测试的跨浏览器解决方案，并具有许多其他有用的功能。|182332|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/ISO_8601|1|http://www.ietf.org/rfc/rfc3339.txt|2|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date|3|http://momentjs.com/^0|0|J|0|7|7|0|N|7|1|0|A|1|0|5|4|G|6|1I|I|2|0|R|9|3|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1B|8|@]|D|@$9|1C|A|1D|1|1E]|$9|1F|A|1G|1|1H]]|E|$]]|$1|H|3|I|5|6|7|1I|8|@$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1L|8|@$9|1M|A|1N|B|C]|$9|1O|A|1P|B|C]]|D|@$9|1Q|A|1R|1|1S]]|E|$]]|$1|L|3|M|5|6|7|1T|8|@]|D|@$9|1U|A|1V|1|1W]]|E|$]]|$1|N|3|O|5|P|7|1X|8|@]|D|@]|E|$Q|R]]|$1|S|3|T|5|6|7|1Y|8|@]|D|@]|E|$]]|$1|U|3|-4|5|6|7|1Z|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]|12|$5|X|Y|Z|E|$10|13]]|14|$5|X|Y|Z|E|$10|15]]|16|$5|X|Y|Z|E|$10|17]]]]

<code>getTimezoneOffset()</code> returns the opposite sign of the format required by the spec that you referenced.

This format is also known as <a href="http://en.wikipedia.org/wiki/ISO_8601">ISO8601</a>, or more precisely as <a href="http://www.ietf.org/rfc/rfc3339.txt">RFC3339</a>.

In this format, UTC is represented with a <code>Z</code> while all other formats are represented by an offset from UTC. The meaning is the same as JavaScript's, but the order of subtraction is inverted, so the result carries the opposite sign.

Also, there is no method on the native <code>Date</code> object called <code>format</code>, so your function in #1 will fail unless you are using a library to achieve this. Refer to <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date">this documentation</a>.

If you are seeking a library that can work with this format directly, I recommend trying <a href="http://momentjs.com/">moment.js</a>. In fact, this is the default format, so you can simply do this:

<pre><code>var m = moment(); // get "now" as a moment
var s = m.format(); // the ISO format is the default so no parameters are needed

// sample output: 2013-07-01T17:55:13-07:00
</code></pre>

This is a well-tested, cross-browser solution, and has many other useful features.

blocks|key|183789|text|这是我的客户端时区函数，它轻量级且简单|type|unstyled|depth|inlineStyleRanges|entityRanges|data|183790|++function+getCurrentDateTimeMySql()+{++++++++
++++++var+tzoffset+=+(new+Date()).getTimezoneOffset()+*+60000;+//offset+in+milliseconds
++++++var+localISOTime+=+(new+Date(Date.now()+-+tzoffset)).toISOString().slice(0,+19).replace('T',+'+');
++++++var+mySqlDT+=+localISOTime;
++++++return+mySqlDT;
++}|code-block|syntax|javascript|183791|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is my function for the clients timezone, it's lite weight and simple

<pre><code> function getCurrentDateTimeMySql() { 
 var tzoffset = (new Date()).getTimezoneOffset() * 60000; //offset in milliseconds
 var localISOTime = (new Date(Date.now() - tzoffset)).toISOString().slice(0, 19).replace('T', ' ');
 var mySqlDT = localISOTime;
 return mySqlDT;
 }
</code></pre>

blocks|key|2799546|text|这里只有我的两点意见|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2799547|我在使用datetimes时遇到了这个问题，所以我所做的是：|2799548|const+moment+=+require('moment-timezone')

const+date+=+moment.tz('America/Bogota').format()|code-block|syntax|javascript|2799549|然后将日期保存到数据库中，以便能够从某个查询中进行比较。|2799550|2799551|安装moment-timezone的步骤|offset|length|style|CODE|2799552|npm+i+moment-timezone|2799553|entityMap^0|0|0|0|0|0|2|F|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|X|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Y|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|10|8|@$N|11|O|12|P|Q]]|9|@]|A|$]]|$1|R|3|S|5|F|7|13|8|@]|9|@]|A|$G|H]]|$1|T|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|U|$]]

Just my two cents here
I was facing this issue with datetimes so what I did is this:
<pre><code>const moment = require('moment-timezone')

const date = moment.tz('America/Bogota').format()
</code></pre>
Then save date to db to be able to compare it from some query.
<hr />
To install <code>moment-timezone</code>
<pre><code>npm i moment-timezone
</code></pre>

blocks|key|182370|text|请检查以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|182371|function+dateToLocalISO(date)+{
++++const+off++++=+date.getTimezoneOffset()
++++const+absoff+=+Math.abs(off)
++++return+(new+Date(date.getTime()+-+off*60*1000).toISOString().substr(0,23)+%2B
++++++++++++(off+>+0+?+'-'+:+'%2B')+%2B+
++++++++++++Math.floor(absoff+/+60).toFixed(0).padStart(2,'0')+%2B+':'+%2B+
++++++++++++(absoff+%25+60).toString().padStart(2,'0'))
}

//+Test+it:
d+=+new+Date()

dateToLocalISO(d)
//+==>+'2019-06-21T16:07:22.181-03:00'

//+Is+similar+to:

moment+=+require('moment')
moment(d).format('YYYY-MM-DDTHH:mm:ss.SSSZ')+
//+==>+'2019-06-21T16:07:22.181-03:00'|code-block|syntax|javascript|182372|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Check this:
<pre class="lang-js prettyprint-override"><code>function dateToLocalISO(date) {
 const off = date.getTimezoneOffset()
 const absoff = Math.abs(off)
 return (new Date(date.getTime() - off*60*1000).toISOString().substr(0,23) +
 (off &gt; 0 ? '-' : '+') + 
 Math.floor(absoff / 60).toFixed(0).padStart(2,'0') + ':' + 
 (absoff % 60).toString().padStart(2,'0'))
}

// Test it:
d = new Date()

dateToLocalISO(d)
// ==&gt; '2019-06-21T16:07:22.181-03:00'

// Is similar to:

moment = require('moment')
moment(d).format('YYYY-MM-DDTHH:mm:ss.SSSZ') 
// ==&gt; '2019-06-21T16:07:22.181-03:00'
</code></pre>

blocks|key|2799604|text|我认为值得考虑的是，您只需对标准库进行一次API调用即可获得所需的信息……|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2799605|new+Date().toLocaleString(+'sv',+{+timeZoneName:+'short'+}+);

//+produces+"2019-10-30+15:33:47+GMT−4"|code-block|syntax|javascript|2799606|如果要添加分隔符“T”、删除“GMT-”或在末尾附加“：00”，则必须进行文本交换。|2799607|但是，如果你想使用the+other+options，你可以很容易地使用它。使用12小时时间或省略秒等。|offset|length|2799608|请注意，我使用瑞典作为区域设置，因为它是使用ISO8601格式的国家之一。我认为大多数ISO国家使用这种'GMT-4‘格式作为时区偏移量，除了加拿大使用时区缩写，例如。“美国东部夏令时”表示东部夏令时。|2799609|您可以从较新的标准i18n函数"Intl.DateTimeFormat()“中获得相同的结果，但您必须通过选项告诉它包含时间，否则它只会给出日期。|2799610|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DateTimeFormat#Syntax^0|0|0|0|9|H|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|11|8|@]|9|@$K|12|L|13|1|14]]|A|$]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

I think it is worth considering that you can get the requested info with just a single API call to the standard library...

<pre><code>new Date().toLocaleString( 'sv', { timeZoneName: 'short' } );

// produces "2019-10-30 15:33:47 GMT−4"
</code></pre>

You would have to do text swapping if you want to add the 'T' delimiter, remove the 'GMT-', or append the ':00' to the end.

But then you can easily play with <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DateTimeFormat#Syntax" rel="noreferrer">the other options</a> if you want to eg. use 12h time or omit the seconds etc.

Note that I'm using Sweden as locale because it is one of the countries that uses ISO 8601 format. I think most of the ISO countries use this 'GMT-4' format for the timezone offset other then Canada which uses the time zone abbreviation eg. "EDT" for eastern-daylight-time.

You can get the same thing from the newer standard i18n function "Intl.DateTimeFormat()"
 but you have to tell it to include the time via the options or it will just give date.

blocks|key|2799619|text|不需要moment.js+:这是一个完整的往返答案，来自“datetime-”的输入本地类型，它在格林威治时间将一个ISOLocal字符串输出到UTCseconds，然后返回：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2799620|<input+type="datetime-local"+value="2020-02-16T19:30">

isoLocal="2020-02-16T19:30"
utcSeconds=new+Date(isoLocal).getTime()/1000

//here+you+have+1581899400+for+utcSeconds

let+isoLocal=new+Date(utcSeconds*1000-new+Date().getTimezoneOffset()*60000).toISOString().substring(0,16)
2020-02-16T19:30|code-block|syntax|javascript|2799621|entityMap^0|14|1C|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

No moment.js needed: Here's a full round trip answer, from an input type of "datetime-local" which outputs an ISOLocal string to UTCseconds at GMT and back:

<pre><code>&lt;input type="datetime-local" value="2020-02-16T19:30"&gt;

isoLocal="2020-02-16T19:30"
utcSeconds=new Date(isoLocal).getTime()/1000

//here you have 1581899400 for utcSeconds

let isoLocal=new Date(utcSeconds*1000-new Date().getTimezoneOffset()*60000).toISOString().substring(0,16)
2020-02-16T19:30
</code></pre>

blocks|key|184682|text|对于那些只想要YYYY-MM-DD格式的本地时区中的今天日期的人，我的答案略有不同。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|184683|让我说清楚：|184684|我的目标：+today's+date+in+用户的时区，但格式为ISO8601+(YYYY-MM-DD)|offset|length|style|BOLD|184685|代码如下：|184686|new+Date().toLocaleDateString("sv")+//+"2020-02-23"+//+|code-block|syntax|javascript|184687|这是因为瑞典的区域设置使用ISO+8601格式。|184688|entityMap^0|0|0|6|1A|0|0|5|0|0|0|O|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@$F|X|G|Y|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|Z|8|@$F|10|G|11|H|I]]|9|@]|A|$]]|$1|L|3|M|5|N|7|12|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|13|8|@$F|14|G|15|H|I]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|T|$]]

My answer is a slight variation for those who just want today's date in the local timezone in the YYYY-MM-DD format.

Let me be clear:

My Goal: get today's date in the user's timezone but formatted as ISO8601 (YYYY-MM-DD)

Here is the code:

<pre><code>new Date().toLocaleDateString("sv") // "2020-02-23" // 
</code></pre>

This works because the Sweden locale uses the ISO 8601 format.

blocks|key|2799669|text|以下是我用于此目的的函数：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2799670|function+localToGMTStingTime(localTime+=+null)+{
++++var+date+=+localTime+?+new+Date(localTime)+:+new+Date();
++++return+new+Date(date.getTime()+%2B+(date.getTimezoneOffset()+*+60000)).toISOString();
};

function+GMTToLocalStingTime(GMTTime+=+null)+{
++++var+date+=+GMTTime+?+new+Date(GMTTime)+:+new+Date();;
++++return+new+Date(date.getTime()+-+(date.getTimezoneOffset()+*+60000)).toISOString();
};|code-block|syntax|javascript|2799671|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here are the functions I used for this end:
<pre><code>function localToGMTStingTime(localTime = null) {
 var date = localTime ? new Date(localTime) : new Date();
 return new Date(date.getTime() + (date.getTimezoneOffset() * 60000)).toISOString();
};

function GMTToLocalStingTime(GMTTime = null) {
 var date = GMTTime ? new Date(GMTTime) : new Date();;
 return new Date(date.getTime() - (date.getTimezoneOffset() * 60000)).toISOString();
};
</code></pre>

blocks|key|182454|text|您可以通过几个简单的扩展方法来实现这一点。下面的日期扩展方法只返回ISO格式的时区部分，然后您可以为日期/时间部分定义另一个部分，并将它们组合成一个完整的日期-时间-偏移量字符串。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|182455|Date.prototype.getISOTimezoneOffset+=+function+()+{
++++const+offset+=+this.getTimezoneOffset();
++++return+(offset+<+0+?+"%2B"+:+"-")+%2B+Math.floor(Math.abs(offset+/+60)).leftPad(2)+%2B+":"+%2B+(Math.abs(offset+%25+60)).leftPad(2);
}

Date.prototype.toISOLocaleString+=+function+()+{
++++return+this.getFullYear()+%2B+"-"+%2B+(this.getMonth()+%2B+1).leftPad(2)+%2B+"-"+%2B
++++++++this.getDate().leftPad(2)+%2B+"T"+%2B+this.getHours().leftPad(2)+%2B+":"+%2B
++++++++this.getMinutes().leftPad(2)+%2B+":"+%2B+this.getSeconds().leftPad(2)+%2B+"."+%2B
++++++++this.getMilliseconds().leftPad(3);
}

Number.prototype.leftPad+=+function+(size)+{
++++var+s+=+String(this);
++++while+(s.length+<+(size+%7C%7C+2))+{
++++++++s+=+"0"+%2B+s;
++++}
++++return+s;
}|code-block|syntax|javascript|182456|示例用法：|182457|var+date+=+new+Date();
console.log(date.toISOLocaleString()+%2B+date.getISOTimezoneOffset());
//+Prints+"2020-08-05T16:15:46.525%2B10:00"|182458|我知道现在是2020年了，大多数人可能已经在使用Moment.js了，但简单的复制和粘贴解决方案有时还是很方便的。|182459|(我之所以将日期/时间和偏移量方法分开，是因为我使用的是一个旧的Datejs库，它已经提供了一个具有自定义格式说明符的灵活toString方法，但不包括时区偏移量。因此，我为没有使用该库的任何人添加了toISOLocaleString。)|offset|length|style|CODE|182460|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/datejs/Datejs^0|0|0|0|0|0|1P|8|2S|H|W|6|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|12|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|15|8|@$O|16|P|17|Q|R]|$O|18|P|19|Q|R]]|9|@$O|1A|P|1B|1|1C]]|A|$]]|$1|S|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

You can achieve this with a few simple extension methods. The following Date extension method returns just the timezone component in ISO format, then you can define another for the date/time part and combine them for a complete date-time-offset string.
<pre><code>Date.prototype.getISOTimezoneOffset = function () {
 const offset = this.getTimezoneOffset();
 return (offset &lt; 0 ? &quot;+&quot; : &quot;-&quot;) + Math.floor(Math.abs(offset / 60)).leftPad(2) + &quot;:&quot; + (Math.abs(offset % 60)).leftPad(2);
}

Date.prototype.toISOLocaleString = function () {
 return this.getFullYear() + &quot;-&quot; + (this.getMonth() + 1).leftPad(2) + &quot;-&quot; +
 this.getDate().leftPad(2) + &quot;T&quot; + this.getHours().leftPad(2) + &quot;:&quot; +
 this.getMinutes().leftPad(2) + &quot;:&quot; + this.getSeconds().leftPad(2) + &quot;.&quot; +
 this.getMilliseconds().leftPad(3);
}

Number.prototype.leftPad = function (size) {
 var s = String(this);
 while (s.length &lt; (size || 2)) {
 s = &quot;0&quot; + s;
 }
 return s;
}
</code></pre>
Example usage:
<pre><code>var date = new Date();
console.log(date.toISOLocaleString() + date.getISOTimezoneOffset());
// Prints &quot;2020-08-05T16:15:46.525+10:00&quot;
</code></pre>
I know it's 2020 and most people are probably using Moment.js by now, but a simple copy &amp; pastable solution is still sometimes handy to have.
(The reason I split the date/time and offset methods is because I'm using an old <a href="https://github.com/datejs/Datejs" rel="nofollow noreferrer">Datejs</a> library which already provides a flexible <code>toString</code> method with custom format specifiers, but just doesn't include the timezone offset. Hence, I added <code>toISOLocaleString</code> for anyone without said library.)

blocks|key|2799727|text|function+setDate(){
++++var+now+=+new+Date();
++++now.setMinutes(now.getMinutes()+-+now.getTimezoneOffset());
++++var+timeToSet+=+now.toISOString().slice(0,16);

++++/*
++++++++If+you+have+an+element+called+"eventDate"+like+the+following:

++++++++<input+type="datetime-local"+name="eventdate"+id="eventdate"+/>

++++++++and+you+would+like+to++set+the+current+and+minimum+time+then+use+the+following:
++++*/

++++var+elem+=+document.getElementById("eventDate");
++++elem.value+=+timeToSet;
++++elem.min+=+timeToSet;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2799728|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>function setDate(){
 var now = new Date();
 now.setMinutes(now.getMinutes() - now.getTimezoneOffset());
 var timeToSet = now.toISOString().slice(0,16);

 /*
 If you have an element called &quot;eventDate&quot; like the following:

 &lt;input type=&quot;datetime-local&quot; name=&quot;eventdate&quot; id=&quot;eventdate&quot; /&gt;

 and you would like to set the current and minimum time then use the following:
 */

 var elem = document.getElementById(&quot;eventDate&quot;);
 elem.value = timeToSet;
 elem.min = timeToSet;
}
</code></pre>

blocks|key|3012065|text|只使用javascript而不使用库实际上只有两行代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3012066|var+dt+=+new+Date();
//+Date+in+UTC+and+ISO+format:+"2021-11-30T20:33:32.222Z"
console.log(dt.toISOString());
var+dtOffset+=+new+Date(dt.setMinutes(dt.getMinutes()+-+dt.getTimezoneOffset()));
//+Date+in+EST+and+ISO+format:+"2021-11-30T15:33:32.222Z"
console.log(dtOffset.toISOString());|code-block|syntax|javascript|3012067|new+Date()将默认为当前区域设置，但如果需要，您也可以直接指定：|offset|length|style|CODE|3012068|var+dt+=+new+Date(new+Date().toLocaleString("en-US",+{timeZone:+"America/New_York"}));|3012069|entityMap^0|0|0|0|A|0|0|2E|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@$I|W|J|X|K|L]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

Using just javascript with no libraries is really just two lines:
<pre><code>var dt = new Date();
// Date in UTC and ISO format: &quot;2021-11-30T20:33:32.222Z&quot;
console.log(dt.toISOString());
var dtOffset = new Date(dt.setMinutes(dt.getMinutes() - dt.getTimezoneOffset()));
// Date in EST and ISO format: &quot;2021-11-30T15:33:32.222Z&quot;
console.log(dtOffset.toISOString());
</code></pre>
<code>new Date()</code> will default to the current locale but you can also specify it directly if needed:
<code>var dt = new Date(new Date().toLocaleString(&quot;en-US&quot;, {timeZone: &quot;America/New_York&quot;}));</code>

Goal: Find the <code>local time</code> and <code>UTC time offset</code> then construct the URL in following format.

Example URL: /Actions/Sleep?duration=2002-10-10T12:00:00−05:00

The format is based on the W3C recommendation:
<a href="http://www.w3.org/TR/xmlschema11-2/#dateTime" rel="noreferrer">http://www.w3.org/TR/xmlschema11-2/#dateTime</a>

The documentation says:

<blockquote>
 For example, 2002-10-10T12:00:00−05:00 (noon on 10 October 2002, 
 Central Daylight Savings Time as well as Eastern Standard Time in the U.S.) 
 is equal to 2002-10-10T17:00:00Z, five hours later than 2002-10-10T12:00:00Z.
</blockquote>

So based on my understanding, I need to find my local time by new Date() then use getTimezoneOffset() function to compute the difference then attach it to the end of string.

1.Get local time with format

<pre><code>var local = new Date().format("yyyy-MM-ddThh:mm:ss"); //today (local time)
</code></pre>

output

<pre><code>2013-07-02T09:00:00
</code></pre>

2.Get UTC time offset by hour

<pre><code>var offset = local.getTimezoneOffset() / 60;
</code></pre>

output

<pre><code>7
</code></pre>

3.Construct URL (time part only)

<pre><code>var duration = local + "-" + offset + ":00";
</code></pre>

output:

<pre><code>2013-07-02T09:00:00-7:00
</code></pre>

The above output means my local time is 2013/07/02 9am and difference from UTC is 7 hours (UTC is 7 hours ahead of local time)

So far it seems to work but what if getTimezoneOffset() returns negative value like -120?

I'm wondering how the format should look like in such case because I cannot figure out from W3C document. Thanks in advance.

How to ISO 8601 format a Date with Timezone Offset in JavaScript?

数据库

目标：找到local time和UTC time offset，然后构造以下格式的URL。示例网址: /Actions/Sleep?duration=2002-10-10T12:00:00−05:00该格式基于W3C建议：文档中写道：例如， 2002- 10 -10T12:00:00−05:00 ( 2002年10月1...

问如何在JavaScript中使用ISO8601时区偏移格式化日期？
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