Title: Advanced Validation
Last modified: April 30, 2020

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# Advanced Validation

 *  Resolved [ocbroadband](https://wordpress.org/support/users/ocbroadband/)
 * (@ocbroadband)
 * [6 years, 1 month ago](https://wordpress.org/support/topic/advanced-validation/)
 * Trying to figure out what I need to put into the field to compare it to another
   field? I attempted to use the slug, but that didn’t work. I nmy case, I want 
   to make sure the date being entered is the same or later/greater than the date
   in the field the validation is on. Is this possible with this validation feature?
   
   [https://prntscr.com/s8rl6o](https://prntscr.com/s8rl6o)

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Author [Konrad Chmielewski](https://wordpress.org/support/users/hwk-fr/)
 * (@hwk-fr)
 * [6 years, 1 month ago](https://wordpress.org/support/topic/advanced-validation/#post-12766462)
 * Hello,
 * Thanks for the report. I’ve answered you on Slack, but I’ll copy paste my answer
   here, so it can help other users too 🙂
 * The Advanced Validation feature is here to let people quickly setup custom validation
   on field, using an UI (instead of adding code). The UI doesn’t support the comparison
   with other fields.
 * Here is an example of Advanced Validation Usage. If the user type “Hello” in 
   the text field, then the error `"Hello" is not allowed. Type something else.`
   will be displayed
 * Screenshot: [https://i.imgur.com/wVeC5CX.png](https://i.imgur.com/wVeC5CX.png)
 * In your case, you’re using “Date” field. If you want to compare date value, you
   have to know how it is saved in the database. To do so, you can create a “test
   field group”, with one single field: “Date”. Create a new page, and enter a value
   inside the “Date” field, then save the page.
 * Go in your `functions.php` file and add the following line: `define('ACFE_dev',
   true);`. Then save the save file, and refresh your admin page.
 * This will enable the “ACF Extended: Dev Mode”. You’ll now see what data are saved
   in any admin page. For our example:
 * Screenshot: [https://i.imgur.com/LKzkJ3X.png](https://i.imgur.com/LKzkJ3X.png)
 * As you can see, the format saved is kinda “custom”, ACF is saving the date value
   in the following format: `20200501` `Ymd` (YearMonthDay). It is also explained
   in the field documentation here: [https://www.advancedcustomfields.com/resources/date-picker/](https://www.advancedcustomfields.com/resources/date-picker/)
 * This format has been chosen, so the developer can easily sort/compare data. In
   your case, you can specify:
 * `If value <= 20200509 | error: "Please select a date after the 09/05/2020"`
 * Screenshot: [https://i.imgur.com/WrpMvP1.png](https://i.imgur.com/WrpMvP1.png)
 * Screenshot: [https://i.imgur.com/qF5QCV4.png](https://i.imgur.com/qF5QCV4.png)
 * If you want to create a dynamic validation, based on a dynamic date from an another
   field, you’ll have to add some code, as it can’t be done from the UI.
    Here is
   the documentation: [https://www.advancedcustomfields.com/resources/acf-validate_value/](https://www.advancedcustomfields.com/resources/acf-validate_value/)
 * Hope it helps!
 * Have a nice day.
 * Regards.
 *  Thread Starter [ocbroadband](https://wordpress.org/support/users/ocbroadband/)
 * (@ocbroadband)
 * [6 years, 1 month ago](https://wordpress.org/support/topic/advanced-validation/#post-12769975)
 * Thank you for the detail explanation. Wasn’t looking forward to coding anything,
   but maybe in time, this will be a feature? 🙂
 * Thanks again!

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Advanced Validation’ is closed to new replies.

 * ![](https://ps.w.org/acf-extended/assets/icon-256x256.png?rev=2071550)
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 * 2 replies
 * 2 participants
 * Last reply from: [ocbroadband](https://wordpress.org/support/users/ocbroadband/)
 * Last activity: [6 years, 1 month ago](https://wordpress.org/support/topic/advanced-validation/#post-12769975)
 * Status: resolved