bigmoment/proto/millennium.js

Date manipulation that can track the age of the universe

const ordinalize = require('ordinalize');

exports.millennium = function(options = {}){
	const year = this.year();
	let millenniumIndex = Math.floor( year / 1000 );
	if(year >= 0){
		if(options.format === 'ordinal'){
			let millenniumNumber = millenniumIndex + 1;
			return ordinalize(millenniumNumber) + ' CE';
		}
  }else{
		if(options.format === 'ordinal'){
			let millenniumNumber = Math.abs(millenniumIndex);
			return ordinalize(millenniumNumber) + ' BCE';
		}
	}

  return millenniumIndex;
}

exports.isMillennium = function(){
  let input = this._i
	return typeof input === 'string' && new RegExp("^-?[0-9]$").test(input)
}