php 时间
本周一
echo date('Y-m-d',(time()-((date('w')==0?7:date('w'))-1)*24*3600)); //w为星期几的数字形式,这里0为周日
本周日
echo date('Y-m-d',(time()+(7-(date('w')==0?7:date('w')))*24*3600)); //同样使用w,以现在与周日相关天数算
上周一
echo date('Y-m-d',strtotime('-1 monday', time())); //无论今天几号,-1 monday为上一个有效周未
上周日
echo date('Y-m-d',strtotime('-1 sunday', time())); //上一个有效周日,同样适用于其它星期
本月一日
echo date('Y-m-d',strtotime(date('Y-m', time()).'-01 00:00:00')); //直接以strtotime生成
本月最后一日
echo date('Y-m-d',strtotime(date('Y-m', time()).'-'.date('t', time()).' 00:00:00')); //t为当月天数,28至31天
上月一日
echo date('Y-m-d',strtotime('-1 month', strtotime(date('Y-m', time()).'-01 00:00:00'))); //本月一日直接strtotime上减一个月
上月最后一日
echo date('Y-m-d',strtotime(date('Y-m', time()).'-01 00:00:00')-86400); //本月一日减一天即是上月最后一日

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