js时间比较

//时间比较,时间格式为"yyyy-MM-dd hh:mm:ss"
function compareDate(date1, date2){ //date1是否大于date2
var year1 = date1.substring(0,date1.indexOf("-"));
var year2 = date2.substring(0,date2.indexOf("-"));
var month1 = date1.substring(date1.indexOf("-")+1,date1.lastIndexOf("-"));
var month2 = date2.substring(date2.indexOf("-")+1,date2.lastIndexOf("-"));
var day1 = date1.substring(date1.lastIndexOf("-")+1,date1.indexOf(" "));
var day2 = date2.substring(date2.lastIndexOf("-")+1,date2.indexOf(" "));

if( parseInt(year1) > parseInt(year2) ){
   return true;
}else if( parseInt(year1) < parseInt(year2) ){
   return false;
}else if( parseInt(month1) > parseInt(month2) ){
   return true;
}else if( parseInt(month1) < parseInt(month2) ){
   return false;
}else if( parseInt(day1) > parseInt(day2) ){
   return true;
}

return false;
}

//判断时间是否在一个月内,时间格式为"yyyy-MM-dd hh:mm:ss"
function isNew(date){
var now = new Date();
var newtime = now.getFullYear() + "-" + (now.getMonth()) + "-" + now.getDate() + " 00:00:00";

return compareDate(date, newtime);
}