Is there a way to convert a string like "20150415" into a date with the format "2015, April, 15th"? I've come across multiple examples, but they all involve splitting with "-" or "/", which doesn't work for my case.
Below is my current code snippet:
var d = parseInt(document.getElementById('date').value);
d = new Date(d[4], d[2] - 1, d[2]);
document.getElementById('date').value = d;
Any assistance on this matter would be highly appreciated.
If you have a string in the format "YYYYMMDD", you can easily extract the individual parts by using substrings. One approach is to employ a regular expression:
> "20150415".match(/(\d{4})(\d{2})(\d{2})/)
["20150415", "2015", "04", "15"]
After extracting the year, month, and day, you can then utilize the Date constructor.
It's important to note that JavaScript does not natively support formatting dates. For formatting purposes, it's recommended to consider using a library. For more information, you can refer to Where can I find documentation on formatting a date in JavaScript?
Transform this date formatter which converts the string value '20150415' into 'April 4, 2015'. Customize the date format by adjusting the last line of the DateFormat.toLong function.
var DateFormat = {
months: ['January', 'February', 'March', 'April', 'May', 'June',
'July', 'August', 'September', 'October', 'November', 'December'],
toLong: function toLongDate(s) { // s is a string like '20150415'
var year = parseInt(s.substring(0, 4), 10),
month = DateFormat.months[parseInt(s.substring(4, 6), 10) - 1],
day = parseInt(s.substring(6), 10);
return month + ' ' + day + ', ' + year;
}
};
// A quick test.
alert(DateFormat.toLong('20150415'));
Remember to specify a radix when using parseInt to avoid misinterpretations based on the input string. Failure to do so may lead to parsing strings starting with '0' as octal instead of decimal. More information is available in the JavaScript documentation on the Mozilla Developer Network:
If the input string begins with "0", the radix is either eight (octal) or ten (decimal), which can vary depending on the implementation. While ECMAScript 5 specifies the use of 10 (decimal), not all browsers fully support this yet. Therefore, it is advisable to always specify a radix when utilizing parseInt.
Give this a shot:
var months = ['January', 'February', 'March', 'April', 'May', 'June',
'July', 'August', 'September', 'October', 'November', 'December'];
var format = function(dateString) {
var array = dateString.match(/^(\d{4})(\d{2})(\d{2})$/);
array.splice(0, 1);
array[1] = months[+(array[1]) - 1];
return array.join(", ");
};
alert(format('20150412'));//"2015, April, 12"
While @"Felix Kling"'s solution may be more advanced, I suggest a simpler approach:
let date = "20150415";
//Extract the first 4 characters and convert to integer, do the same for month and day
let year = parseInt(date.substr(0,4));
//Subtract 1 since months are zero-based (January = 0)
let month = parseInt(date.substr(4,2))-1;
let day = parseInt(date.substr(6,2));
date = new Date(year, month, day); // date now stores the desired result
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