How to Convert String to Datetime With Format Specification in JavaScript

How can I convert string to datetime with format specification in JavaScript?

I think this can help you: http://www.mattkruse.com/javascript/date/

There's a getDateFromFormat() function that you can tweak a little to solve your problem.

Update: there's an updated version of the samples available at javascripttoolbox.com

Convert string to datetime

For this format (assuming datepart has the format dd-mm-yyyy) in plain javascript use dateString2Date. It may bite you, because of browser compatibility problems.

tryParseDateFromString is ES6 utility method to parse a date string using a format string parameter (format) to inform the method about the position of date/month/year in the input string. The date is constructed using Date.UTC, circumventing the aforementioned browser compatibility problems.

See also

// fixed format dd-mm-yyyy
function dateString2Date(dateString) {
  const dt = dateString.split(/\-|\s/);
  return new Date(dt.slice(0, 3).reverse().join('-') + ' ' + dt[3]);
}

// multiple formats (e.g. yyyy/mm/dd (ymd) or mm-dd-yyyy (mdy) etc.)
function tryParseDateFromString(dateStringCandidateValue, format = "ymd") {
  const candidate = (dateStringCandidateValue || ``)
    .split(/[ :\-\/]/g).map(Number).filter(v => !isNaN(v));
  const toDate = () => {
    format = [...format].reduce((acc, val, i) => ({ ...acc,  [val]: i }), {});
    const parts = 
      [candidate[format.y], candidate[format.m] - 1, candidate[format.d] ]
        .concat(candidate.length > 3 ? candidate.slice(3) : []);
    const checkDate = d => d.getDate && 
      ![d.getFullYear(), d.getMonth(), d.getDate()]
        .find( (v, i) => v !== parts[i] ) && d || undefined;
    
    return checkDate( new Date(Date.UTC(...parts)) );
  };

  return candidate.length < 3 ? undefined : toDate();
}

const result = document.querySelector('#result');

result.textContent =
  `*Fixed\ndateString2Date('01-01-2016 00:03:44'):\n => ${
    dateString2Date('01-01-2016 00:03:44')}`;

result.textContent +=
  `\n\n*With formatting dmy
tryParseDateFromString('01-12-2016 00:03:44', 'dmy'):\n => ${
tryParseDateFromString('01-12-2016 00:03:44', "dmy").toUTCString()}`;

result.textContent +=
  `\n\n*With formatting mdy
tryParseDateFromString('03/01/1943', 'mdy'):\n => ${
tryParseDateFromString('03/01/1943', "mdy").toUTCString()}`;

result.textContent +=
  `\n\n*With invalid format
tryParseDateFromString('12-13-2016 00:03:44', 'dmy'):\n => ${
tryParseDateFromString('12-13-2016 00:03:44', "dmy")}`;

result.textContent +=
  `\n\n*With formatting invalid string
tryParseDateFromString('03/01/null', 'mdy'):\n => ${
tryParseDateFromString('03/01/null', "mdy")}`;

result.textContent +=
  `\n\n*With formatting no parameters
tryParseDateFromString():\n => ${tryParseDateFromString()}`;

<pre id="result"></pre>

Convert string to a DateTime format without converting it to your Local Time

Try use with Regex pattern /-|:|T/g for split()

var t = "2017-05-01T07:40:00.000+10:00";

var s =t.split(/-|:|T/g).slice(0,5)

var c =parseInt(s[3]) > 12 ? parseInt(s[3])-12 : s[3];

var f =parseInt(s[3]) > 12 ? 'PM' : 'AM';

console.log(s[1]+'/'+s[2]+'/'+s[0]+'  '+c+':'+s[4]+' '+f);

How to convert date into specific date format

Using toLocaleDateString options

let date = new Date().toLocaleDateString('en-US', {year: 'numeric', month: '2-digit' })

console.log(date)

Converting Javascript String to Datetime

Looks like Date.parse is not going to work because the format the datepicker is returning.

You might want to look at the following thread for parsing solutions or change your format that the datepicker outputs to one of the supported formats.

How can I convert string to datetime with format specification in JavaScript?

http://blog.dygraphs.com/2012/03/javascript-and-dates-what-mess.html

Useful parse info:

http://msdn.microsoft.com/en-us/library/ie/ff743760(v=vs.94).aspx

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