fields: (Date to - Date from) = Total Number of Days

How can I compute the total number of days between two dates using Computed Field?

2 Answers 2


Here is a sample snippet (to be used in Computed Code PHP Block inside of a computed field)

$food_date_value = array_pop(field_get_items($entity_type, $entity, 'field_food_date'));
$food_date = new DateObject($food_date_value['value'], '');
$current_date = new DateObject('now', '', 'm/d/Y');
$entity_field[0]['value'] =$food_date->difference($current_date, 'days');

field_food_date is a date in the Unix Timestamp format (another field in my content type). DateObject can then be used for doing any date calculations.

  • Thanks! but what if the date is not the current date? I also use a pop calendar.
    – noob
    Apr 7, 2014 at 4:49
  • You can feed in the other date similar to how $food_date is constructed
    – rajasaur
    Apr 7, 2014 at 5:02
  • Here is my code and it's not working :( $start_date = array_pop(field_get_items($entity_type, $entity, 'field_date_from')); $end_date = array_pop(field_get_items($entity_type, $entity, 'field_date_to'));) $start_date = new DateObject($start_date['value'], ''); $end_date = new DateObject($end_date['value'], ''); $entity_field[0]['value'] =$start_date->difference($end_date, 'days');
    – noob
    Apr 7, 2014 at 5:16
  • What format are your field_date_from and fielddate_to ? They have to be Unix timestamp based or an array consisting of the keys "year", "date", "month"
    – rajasaur
    Apr 7, 2014 at 8:37
  • Hurrray! I did it. I solved the error. Thanks for your help :)
    – noob
    Apr 15, 2014 at 2:03

If the Machine name of your date-field is 'field_example_date', then the Computed Code (PHP) would be

$startdate = $entity->field_example_date['und'][0]['value']; // Value of start-date
$enddate = $entity->field_example_date['und'][0]['value2']; // Value of end-date

$datediff = strtotime($enddate) - strtotime($startdate);
/* The PHP Function STRTOTIME parses the english textual datetime description
 * into a Unix timestamp

$num_leaves = $datediff/(60*60*24);
/* Since we need the number of days IN-BETWEEN, 
 * we divide the resultant difference by 60*60*24 . 
 * Incase of counting no.of days "FROM" to "TO" days, add 1 to the above result.
 * $num_leaves = $datediff/(60*60*24) + 1;

 $entity_field[0]['value'] = $num_leaves;

The Display Code (PHP) will have

$display_output = $entity_field_item['value'];

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