PHP日期处理的小例子mysql按日期、时间查询的例子

2. //php日期处理
3. date_default_timezone_set('PRC'); //默认时区
4. echo "今天:",date("Y-m-d",time()),"
   ";
5. echo "今天:",date("Y-m-d",strtotime("18 june 2008")),"
   ";
6. echo "昨天:",date("Y-m-d",strtotime("-1 day")), "
   ";
7. echo "明天:",date("Y-m-d",strtotime("+1 day")), "
   ";
8. echo "一周后:",date("Y-m-d",strtotime("+1 week")), "
   "; //bbs.it-home.org
9. 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")), "
   ";
10. echo "下个星期四:",date("Y-m-d",strtotime("next Thursday")), "
    ";
11. echo "上个周一:".date("Y-m-d",strtotime("last Monday"))."
    ";
12. echo "一个月前:".date("Y-m-d",strtotime("last month"))."
    ";
13. echo "一个月后:".date("Y-m-d",strtotime("+1 month"))."
    ";
14. echo "十年后:".date("Y-m-d",strtotime("+10 year"))."
    ";

2，mysql日期操作，按日期、时间查询

2. #mysql查询今天、昨天、7天、近30天、本月、上一月 数据
3. #今天
4. select * from 表名 where to_days(时间字段名) = to_days(now());
5. #昨天
6. SELECT * FROM 表名 WHERE TO_DAYS( NOW( ) ) – TO_DAYS( 时间字段名) <= 1
7. #7天
8. SELECT * FROM 表名 where DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= date(时间字段名)
9. #近30天
10. SELECT * FROM 表名 where DATE_SUB(CURDATE(), INTERVAL 30 DAY) <= date(时间字段名)
11. #本月
12. SELECT * FROM 表名 WHERE DATE_FORMAT( 时间字段名, ‘%Y%m’ ) = DATE_FORMAT( CURDATE( ) , ‘%Y%m’ )
13. #上一月
14. SELECT * FROM 表名 WHERE PERIOD_DIFF( date_format( now( ) , ‘%Y%m’ ) , date_format( 时间字段名, ‘%Y%m’ ) ) =1