获取上一个月的开始日期跟结束日期

获取上一个月的开始日期和结束日期

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?获取最后一天 的下一个月第一天 减去 ?一天的毫秒数 就可以得到。

js 中?getMonth() ?比实际月份数要小1.

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//获取上一月的第一天

?//alert("month:"+now.getFullYear()+","+ now.getMonth());

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?//var curTime = new Date(2013,(4-1),1);

?var curYear =?curTime?.getFullYear();

?var curMonth =?curTime?.getMonth();

?alert("cur:"+curTime.getFullYear()+"-"+(curTime.getMonth()+1)+"-"+curTime.getDate());?

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?var curMonthFirstDay = new Date(curYear,curMonth,1);

?var beforeMonth = curMonth-1;

?if(beforeMonth==-1){

? ?curYear = curYear-1;

?beforeMonth = 11;

?}

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?var beforeStartDate = new Date(curYear,beforeMonth,1);

?alert(beforeStartDate.getFullYear()+"-"+(beforeStartDate.getMonth()+1)+"-"+beforeStartDate.getDate());?

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?var beforeMonthLastDay = new Date(curMonthFirstDay.getTime() - (24*3600*1000));

?alert(beforeMonthLastDay.getFullYear()+"-"+(beforeMonthLastDay.getMonth()+1)+"-"+beforeMonthLastDay.getDate());