1. ## Date Variables?

Is there anyway in php to figure out the number of days between two dates? Given two dates by the user in the format YYYY-MM-DD can I find the number of days between the two. I can change the format if I have too.

2. This is one solution, if date format is kept consistently at YYYY-MM-DD.

PHP Code:
``` <?php \$date0 = "2002-11-25";   //date begin \$date1 = "2003-01-09";   //date end \$dates0 = explode("-",\$date0); \$dates1 = explode("-",\$date1); //Note: 86400 seconds in 1 day echo round((mktime(0,0,0,\$dates1[1],\$dates1[2],\$dates1[0])-mktime(0,0,0,\$dates0[1],\$dates0[2],\$dates0[0]))/86400)." days"; ?> ```

3. Here's a couple of useful date functions I got from somewhere - however, both use the php date timestamp.

PHP Code:
``` function dateAdd (\$interval,  \$number, \$date) {     \$date_time_array  = getdate(\$date);            \$hours =  \$date_time_array["hours"];     \$minutes =  \$date_time_array["minutes"];     \$seconds =    \$date_time_array["seconds"];     \$month =    \$date_time_array["mon"];     \$day =    \$date_time_array["mday"];     \$year    =     \$date_time_array["year"];     switch (\$interval) {         case "yyyy":             \$year    +=\$number;             break;                         case "q":             \$month +=(\$number*3);             break;                         case "m":             \$month +=\$number;             break;                         case "y":         case "d":         case "w":             \$day+=\$number;             break;                         case "ww":             \$day+=(\$number*7);             break;                         case "h":             \$hours+=\$number;             break;                         case "n":             \$minutes+=\$number;             break;                         case "s":             \$seconds+=\$number;             break;                     }              \$timestamp =    mktime(\$hours    ,\$minutes, \$seconds,\$month ,\$day,    \$year);     return \$timestamp; } function dateDiff (\$interval, \$date1,\$date2) {   // get the number of seconds between the two dates     \$timedifference =  \$date2 - \$date1;        switch (\$interval) {     case "w":       \$retval  = \$timedifference / 604800;       break;     case "d":       \$retval  = \$timedifference / 86400;       break;     case "h":       \$retval = \$timedifference / 3600;       break;             case "n":       \$retval  = \$timedifference / 60;       break;             case "s":       \$retval  = \$timedifference;       break;           }  ```
\$retval = floor(\$retval);
return \$retval;
}

?>

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