如何计算PHP中两个日期之间的天数？

Question

I need to calculate days between a date I get from the database and the current date.

$upload_date = mysql_query("SELECT Date FROM Setting WHERE ID = $row[ID]");
$current_date = date("Y-m-d");

How do I do it?

Answer 1

select datediff(curdate(),'2011-03-01');

Answer 2

If you want to do it in PHP, then use the DateTime class:

$current = new DateTime($current_date);
$db_date = new DateTime($upload_date);
$days = $current->diff($db_date)->days;

Or the oldschool way:

$days = round((strtotime($current) - strtotime($db_date)) /24 /60 /60);

Answer 3

Use SELECT DATEDIFF('new_date', 'old_date');

mysql> SELECT DATEDIFF('2006-04-01','2006-04-01');
+-------------------------------------+
| DATEDIFF('2006-04-01','2006-04-01') |
+-------------------------------------+
|                                   0 |
+-------------------------------------+
1 row in set (0.00 sec)

mysql> SELECT DATEDIFF('2006-04-01','2007-04-01');
+-------------------------------------+
| DATEDIFF('2006-04-01','2007-04-01') |
+-------------------------------------+
|                                -365 |
+-------------------------------------+
1 row in set (0.00 sec)

mysql> SELECT DATEDIFF('2006-04-01','2005-04-01');
+-------------------------------------+
| DATEDIFF('2006-04-01','2005-04-01') |
+-------------------------------------+
|                                 365 |
+-------------------------------------+
1 row in set (0.00 sec)

DATEDIFF(expr,expr2)

DATEDIFF() returns the number of days between the start date expr and the end date expr2. expr and expr2 are date or date-and-time expressions. Only the date parts of the values are used in the calculation.

mysql> SELECT DATEDIFF('1997-12-31 23:59:59','1997-12-30');
    -> 1
mysql> SELECT DATEDIFF('1997-11-30 23:59:59','1997-12-31');
    -> -31

Answer 4

form http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_datediff

SELECT DATEDIFF( CURDATE(), Date ) FROM ....

and I would not use Date as field name, consider to change this name

Answer 5

you can do this in a simple way as below,

$current_date = date("Y-m-d");          // Current date
$db_date = date("Y-m-d");               // Date from your database
$diff = abs(strtotime($current_date) - strtotime($db_date));
$total_days = floor ($diff /  (60*60*24));

Answer 6

你可以使用这种格式http://php.net/manual/en/function.date.php ，它会为你做