I am working on a water mgmnt sys for a company and need to add hours to a datetime value in oder to produce a projected datetime value. I dont know if this can be done but any help would be great.
//MAX_TOP = 96 inches
//BARRELS_PER_INCH = 1.67 bbl or barrels per hour
$last_bottom = $row['bottom'];//lets say 33 inches
$last_pulled = $row['last_pulled'];//2012-07-31 09:39:14
$bbl = $row['bbl_per_hour'];//12.70 barrels per hout
$projected_fill = MAX_TOP - $last_bottom;
$projected_barrels = $projected_fill * BARRELS_PER_INCH;
$time_to_fill = $projected_barrels/$bbl;
the result here $time_to_fill gives about 8.2 hours now I need to add this to $last_pulled to get my projected datetime.