At this time, with the other commitments we have, the earliest I expect V3 would be late February, but that may move back a few weeks.

Is the date field that you want to use only going to be used once in the form, and are the dates stored in the database in the SQL/ACF format (YYYYMMDD)? If the answer to both is yes, a manually coded solution is possible, which I could show you.

Otherwise, the coding gets more complex, needing a second custom field for the year, where the value is auto calculated each time you save a post, as per this post:

https://support.searchandfilter.com/forums/topic/datefilter/page/3/#post-238869

OK, and for anybody who has the same conditions that the previous user has, here is a demo form:

https://sandfdev.cdnwebservices.net/shop/

There are 5 ‘posts’, each has one ‘date’, each in a different year (2016-2020 inclusive).

The ‘Year’ field is based on a custom field named first_date_from, and this is an ACF date field with a single date saved in the format YYYYMMDD.

The code below is pasted in to the child theme functions.php file:

function update_date_field_options($input_object, $sfid){
	// ensure we are only filtering the correct field name in the correct form - in this case the field we want to filter has the name '_sfm_first_date_from', based on the field name 'first_date_from'
	if( $input_object['name'] == '_sfm_first_date_from' && $sfid == 42 ) {
		
		// if we want to filter the options generated, we need to make sure the options variable actually exists before proceeding (its only available to certain field types)
		if( ! isset( $input_object['options'] ) ) {
			return $input_object;
		}
		//udpate this field before rendering
		//all the options are stored in $input_object['options'] as an array
		$new_options = array();

		//create a new "default" option
		$new_option = new StdClass();
		$new_option->value = "";
		$new_option->label = "All Years";
		array_push($new_options, $new_option);	
	
		//create a new range option we want to add
		$new_option = new StdClass();
		$new_option->value = "20160101+20161231"; //this is the value that goes in the URL, which affects the query
		$new_option->label = "2016"; //the label can be anything
		array_push($new_options, $new_option);//create a new range option we want to add

		$new_option = new StdClass();
		$new_option->value = "20170101+20171231"; //this is the value that goes in the URL, which affects the query
		$new_option->label = "2017"; //the label can be anything
		array_push($new_options, $new_option);//create a new range option we want to add

		$new_option = new StdClass();
		$new_option->value = "20180101+20181231"; //this is the value that goes in the URL, which affects the query
		$new_option->label = "2018"; //the label can be anything
		array_push($new_options, $new_option);//create a new range option we want to add

		$new_option = new StdClass();
		$new_option->value = "20190101+20191231"; //this is the value that goes in the URL, which affects the query
		$new_option->label = "2019"; //the label can be anything
		array_push($new_options, $new_option);//create a new range option we want to add

		$new_option = new StdClass();
		$new_option->value = "20200101+20201231"; //this is the value that goes in the URL, which affects the query
		$new_option->label = "2020"; //the label can be anything
		array_push($new_options, $new_option);//create a new range option we want to add

		//now replace the options with our own custom options:
		$input_object['options'] = $new_options;
	}
	return $input_object;
}

add_filter('sf_input_object_pre', 'update_date_field_options', 10, 2);

I hope you can see how it works by actually sending a date range of 1 Jan to 31 Dec of each year to the form. So, if you want more years, add them as you need.

This is how the field is set:

https://www.screencast.com/t/R2hhmi9WePv

What is the field name? Are you able to send me a live link/URL to your search page so I can take a look?

Ah. You could have named it anything you liked. My code was simple based on what was on my site.

When you are at a point that you can share access (privately of course), then I would need to take a look. I can’t really help much more at this point.