Title: Two date calculation problems
Last modified: July 27, 2023

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# Two date calculation problems

 *  Resolved [fibbu](https://wordpress.org/support/users/fibbu/)
 * (@fibbu)
 * [2 years, 10 months ago](https://wordpress.org/support/topic/two-date-calculation-problems/)
 * Hello;
   I wrote the following code to calculate the 1st date and set the years
   automatically.
 * date1 : fieldname14 selected date
 * date2 : fieldname15 it gets 30/09/YEAR every year.
 *     ```wp-block-code
       (function() {
         var current_year = YEAR(TODAY());
         var first_day_year = '30/09/' + current_year;
   
         jQuery('#calculation-first_day_year').html(first_day_year);
         jQuery('.kriter1-aciklama').html('Başlangıç Hesaplama : ');
         jQuery('.kriter1-sonuc').html(GETDATETIMESTRING(first_day_year, 'dd/mm/yyyy'), 'dd/mm/yyyy');
       })();
       ```
   
 * I get the selected date automatically in the 2nd date.
 * Master calculation code;
 *     ```wp-block-code
       (function() {
         var ay = DATEDIFF(fieldname15, fieldname14, 'dd/mm/yyyy', 'y')['months'];
   
         jQuery('#calculation-ay').html(ay);
         jQuery('.kriter2-aciklama').html('ABC: ');
         jQuery('.kriter2-sonuc').html('<span style="color: orange;">' + ay + '</span>');
   
         return ay;
       })();
       ```
   
 * where am i doing wrong?

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Plugin Author [codepeople](https://wordpress.org/support/users/codepeople/)
 * (@codepeople)
 * [2 years, 10 months ago](https://wordpress.org/support/topic/two-date-calculation-problems/#post-16926719)
 * Hello [@fibbu](https://wordpress.org/support/users/fibbu/)
 * Your first equation needs a return statement to assign the calculated date to
   the field. Otherwise, the calculated field will remain empty:
 *     ```wp-block-code
       (function() {
         var current_year = YEAR(TODAY());
         var first_day_year = '30/09/' + current_year;
   
         jQuery('#calculation-first_day_year').html(first_day_year);
         jQuery('.kriter1-aciklama').html('Başlangıç Hesaplama : ');
         jQuery('.kriter1-sonuc').html(GETDATETIMESTRING(first_day_year, 'dd/mm/yyyy'), 'dd/mm/yyyy');
   
       return first_day_year;
       })();
       ```
   
 *  Thread Starter [fibbu](https://wordpress.org/support/users/fibbu/)
 * (@fibbu)
 * [2 years, 10 months ago](https://wordpress.org/support/topic/two-date-calculation-problems/#post-16926779)
 * Could there be a problem with the code you sent?
 * additionally is the second main calculation equation correct?
   so filedname 15-
   fieldname 14 needs to output date and write month number.
 *  Plugin Author [codepeople](https://wordpress.org/support/users/codepeople/)
 * (@codepeople)
 * [2 years, 10 months ago](https://wordpress.org/support/topic/two-date-calculation-problems/#post-16926857)
 * Hello [@fibbu](https://wordpress.org/support/users/fibbu/)
 * This line of code is incorrect:
 *     ```wp-block-code
       jQuery('.kriter1-sonuc').html(GETDATETIMESTRING(first_day_year, 'dd/mm/yyyy'), 'dd/mm/yyyy');
       ```
   
 * The correct is simply:
 *     ```wp-block-code
       jQuery('.kriter1-sonuc').html(first_day_year);
       ```
   
 * If you have any other question, please, indicate the link to the page that contains
   the form to check your equations in action.
 * Best regardss.
 *  Thread Starter [fibbu](https://wordpress.org/support/users/fibbu/)
 * (@fibbu)
 * [2 years, 10 months ago](https://wordpress.org/support/topic/two-date-calculation-problems/#post-16926929)
 * thanks

Viewing 4 replies - 1 through 4 (of 4 total)

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 * 4 replies
 * 2 participants
 * Last reply from: [fibbu](https://wordpress.org/support/users/fibbu/)
 * Last activity: [2 years, 10 months ago](https://wordpress.org/support/topic/two-date-calculation-problems/#post-16926929)
 * Status: resolved