function last_update() {
	dt = new Date(document.lastModified);
	if (navigator.appVersion.charAt(0) >= "4") {
 		Y= dt.getFullYear()+"年";
	} else {
 		if (de.GetYear() < 2000 ) {
			Y= (dt.GetYear() + 1900)+"年";
 		}
	} 
	M= dt.getMonth() + 1 + "月";
	D1 = dt.getDate() + "日";
	D2 = dt.getDay();
	W = new Array(7);
	W[0] = "日";
	W[1] = "月";
	W[2] = "火";
	W[3] = "水";
	W[4] = "木";
	W[5] = "金";
	W[6] = "土";
	document.write('最終更新日：'+Y+M+D1+'('+W[D2]+')');
}

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