elapsedDays

gistfile1.js

function elapsedDays() {
  var startDay = new Date('2010/08/28');
	var now = new Date();
	var today = new Date();
	var totalDay, Y, M, D, strTime = '';
	today.setFullYear(now.getFullYear(), now.getMonth(), now.getDate());
	totalDay = parseInt((today - startDay) / 86400000, 10);
	Y = Math.floor(totalDay / 365);
	M = Math.floor((totalDay - Y * 365) / 30);
	D = (totalDay - Y * 365 - M * 30);
	if(Y > 0) strTime = Y + '年 ';
	if(M > 0) strTime += M + '個月 ';
	if(D > 0) strTime += D + '天';
	return strTime;
}