（转）js如何去当前时间前一天的时间和后一天

原帖：
http://www.cnblogs.com/hanwenhua/articles/3853352.html

js获取当前日期时间“yyyy-MM-dd HH:MM:SS”

function getNowFormatDate() {
    var  date =  new  Date();
    var  seperator1 =  "-" ;
    var  seperator2 =  ":" ;
    var  month = date.getMonth() + 1;
    var  strDate = date.getDate();
    if  (month >= 1 && month <= 9) {
        month =  "0"  + month;
    }
    if  (strDate >= 0 && strDate <= 9) {
        strDate =  "0"  + strDate;
    }
    var  currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate
            +  " "  + date.getHours() + seperator2 + date.getMinutes()
            + seperator2 + date.getSeconds();
    return  currentdate;
}

js获取当前时间前一天的时间和后一天

function  GetDateStr(AddDayCount) {
    var  dd =  new  Date();
        dd.setDate(dd.getDate()+AddDayCount); //获取AddDayCount天后的日期
        var  y = dd.getFullYear();
        var  m = dd.getMonth()+1; //获取当前月份的日期
        var  d = dd.getDate();
        return  y+ "-" +m+ "-" +d;
}
document.write( "前天：" +GetDateStr(-2));
document.write( "昨天：" +GetDateStr(-1));
document.write( "今天：" +GetDateStr(0));
document.write( "明天：" +GetDateStr(1));
document.write( "后天：" +GetDateStr(2));
document.write( "大后天：" +GetDateStr(3));