js获取当前时间前一周时间前一个月时间

//获取系统当前时间  
var nowdate = new Date();  
var y = nowdate.getFullYear();  
var m = nowdate.getMonth()+1;  
var d = nowdate.getDate();  
var formatnowdate = y+'-'+m+'-'+d;  
$("#enddate").datebox("setValue",formatnowdate);  
//获取系统前一周的时间  
var oneweekdate = new Date(nowdate-7*24*3600*1000);  
var y = oneweekdate.getFullYear();  
var m = oneweekdate.getMonth()+1;  
var d = oneweekdate.getDate();  
var formatwdate = y+'-'+m+'-'+d;  
$("#fdate").datebox("setValue",formatwdate);  
//获取系统前一个月的时间  
nowdate.setMonth(nowdate.getMonth()-1);  
var y = nowdate.getFullYear();  
var m = nowdate.getMonth()+1;  
var d = nowdate.getDate();  
var formatwdate = y+'-'+m+'-'+d;  
$("#fdate").datebox("setValue",formatwdate);

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