JavaScript Snippets
Here are some snippets that would’ve saved me many minutes of my time.
YYYYMMDDHHMM to Date
We don’t need to add to Date.prototype here
because we will call this function from the Date class
itself and not an instanace of Date. If we
wanted to call it from any Date instance,
then we would have to edit the prototype as shown
in the toX snippets.
Date.fromYYYYMMDDHHMM = s => {
var yyyy = s.substring(0, 4);
var mm = s.substring(4, 6);
var dd = s.substring(6, 8);
var hh = s.substring(8, 10) || '00';
var min = s.substring(10, 12) || '00';
var sec = s.substring(12, 14) || '00';
return new Date(yyyy, mm - 1, dd, hh, min, sec);
}
Date to YYYYMMDDHHMM
Date.prototype.toYYYYMMDDHHMM = function() {
// YYYYMMDDHHMM
// 202105070400
const tzoffset = this.getTimezoneOffset() * 60000;
const localDate = new Date(this - tzoffset);
return localDate.toISOString().replace(/[^0-9]/g, '').slice(0, 12);
}
YYYYMMDD to Date
Date.fromYYYYMMDD = s => {
var yyyy = s.substring(0, 4);
var mm = s.substring(4, 6);
var dd = s.substring(6, 8);
return new Date(yyyy, mm - 1, dd);
}
Date to YYYYMMDD
Date.prototype.toYYYYMMDD = function() {
var mm = this.getMonth() + 1; // getMonth() is zero-based
var dd = this.getDate();
return [this.getFullYear(), (mm > 9 ? '' : '0') + mm, (dd > 9 ? '' : '0') + dd].join('');
};