PHP今天，昨天，明天处理。mysql 查询今天、昨天、7天数据；mysql按日期分组统计

date_default_timezone_set('PRC'); //默认时区
echo "今天:",date("Y-m-d",time()),"
";
echo "今天:",date("Y-m-d",strtotime("18 june 2008")),"
";
echo "昨天:",date("Y-m-d",strtotime("-1 day")), "
";
echo "明天:",date("Y-m-d",strtotime("+1 day")), "
";
echo "一周后:",date("Y-m-d",strtotime("+1 week")), "
";
echo "一周零两天四小时两秒后:",date("Y-m-d G:H:s",strtotime("+1 week 2 days 4 hours 2 seconds")), "
";
echo "下个星期四:",date("Y-m-d",strtotime("next Thursday")), "
";
echo "上个周一:".date("Y-m-d",strtotime("last Monday"))."
";
echo "一个月前:".date("Y-m-d",strtotime("last month"))."
";
echo "一个月后:".date("Y-m-d",strtotime("+1 month"))."
";
echo "十年后:".date("Y-m-d",strtotime("+10 year"))."
";

mysql查询今天、昨天、7天、近30天、本月、上一月 数据

#今天
select * from 表名 where to_days(时间字段名) = to_days(now());
#昨天
SELECT * FROM 表名 WHERE TO_DAYS( NOW( ) ) – TO_DAYS( 时间字段名) <= 1
#7天
SELECT * FROM 表名 where DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= date(时间字段名)
#近30天
SELECT * FROM 表名 where DATE_SUB(CURDATE(), INTERVAL 30 DAY) <= date(时间字段名)
#本月
SELECT * FROM 表名 WHERE DATE_FORMAT( 时间字段名, ‘%Y%m’ ) = DATE_FORMAT( CURDATE( ) , ‘%Y%m’ )
#上一月
SELECT * FROM 表名 WHERE PERIOD_DIFF( date_format( now( ) , ‘%Y%m’ ) , date_format( 时间字段名, ‘%Y%m’ ) ) =1

create_time时间格式

SELECT DATE_FORMAT(create_time,'%Y%u') weeks,COUNT(id) COUNT FROM role GROUP BY weeks;

SELECT DATE_FORMAT(create_time,'%Y%m%d') days,COUNT(id) COUNT FROM role GROUP BY days;
SELECT DATE_FORMAT(create_time,'%Y%m') months,COUNT(id) COUNT FROM role GROUP BY months

create_time时间戳格式

SELECT FROM_UNIXTIME(create_time,'%Y%u') weeks,COUNT(id) COUNT FROM role GROUP BY weeks;
SELECT FROM_UNIXTIME(create_time,'%Y%m%d') days,COUNT(id) COUNT FROM role GROUP BY days;
SELECT FROM_UNIXTIME(create_time,'%Y%m') months,COUNT(id) COUNT FROM role GROUP BY months

//PHP 获取当前天的开始时间、结束时间：

//PHP mktime()函数，返回一个指定日期的Unix时间戳。



$t = time();
$start_time = mktime(0,0,0,date("m",$t),date("d",$t),date("Y",$t));  //当天开始时间
$end_time = mktime(23,59,59,date("m",$t),date("d",$t),date("Y",$t)); //当天结束时间





//获取当前月的开始时间、结束时间：

$date = date("Y-m-d");
$firstday = date('Y-m-01', strtotime($date));
$lastday = date('Y-m-d', strtotime("$firstday +1 month -1 day"));
 

$firstday = date('Y-m-01 00:00:00', strtotime($date));  //本月第一天

$lastday = date('Y-m-d 23:59:59', strtotime("$firstday +1 month -1 day")); //本月最后一天





//其他时间：

echo " 本月共有:".date("t")."天";
echo " 当前年份".date('Y');
echo " 当前月份".date('m');
echo " 当前几号".date('d');