Is it possible to generate the string "2013-02-01T00:00:00-05:00" using only the Date object's built-in methods, without utilizing regular expressions or substring manipulation techniques?
Is it possible to generate the string "2013-02-01T00:00:00-05:00" using only the Date object's built-in methods, without utilizing regular expressions or substring manipulation techniques?
Employing solely the Date object's internal methods
Unfortunately, JavaScript does not allow for outputting ISO 8601 strings with a customized timezone value. The .toISOString method always utilizes Z (UTC).
To achieve this customization, you must utilize various getter methods and manually construct the string. Expanding on the principles presented in How do I output an ISO 8601 formatted string in JavaScript? and How to convert ISOString to local ISOString in javascript?:
function customISOstring(date, offset) {
var date = new Date(date), // duplicate instance
h = Math.floor(Math.abs(offset)/60),
m = Math.abs(offset) % 60;
date.setMinutes(date.getMinutes() - offset); // implement custom timezone
function pad(n) { return n < 10 ? '0' + n : n }
return date.getUTCFullYear() + '-' // return custom format
+ pad(date.getUTCMonth() + 1) + '-'
+ pad(date.getUTCDate()) + 'T'
+ pad(date.getUTCHours()) + ':'
+ pad(date.getUTCMinutes()) + ':'
+ pad(date.getUTCSeconds())
+ (offset==0 ? "Z" : (offset<0 ? "+" : "-") + pad(h) + ":" + pad(m));
}
Surprisingly, the solution is quite straightforward. However, to prevent redundancy, you'll need to implement a helper function:
const addPadding = function(n) {return n < 10 ? "0"+n : n;};
const formattedDate = date.getFullYear()+"-"+addPadding(date.getMonth()+1)+"-"+addPadding(date.getDate())
+"T"+addPadding(date.getHours())+":"+addPadding(date.getMinutes())+":"+addPadding(date.getSeconds())
+(date.getTimezoneOffset() > 0 ? "-" : "+")
+addPadding(Math.floor(date.getTimezoneOffset()/60))
+":"+addPadding(date.getTimezoneOffset()%60);
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