function get_unix_time(dateStr)
{
dateStr = dateStr.replace('年','-');
dateStr = dateStr.replace('月','-');
dateStr = dateStr.replace('日','-');
var newstr = dateStr.replace(/-/g,'/');
var date = new Date(newstr);
var time_str = date.getTime().toString();
return time_str.substr(0, 10);
}
get_unix_time("2015年04月07日");