PHP8 + MAX aggregation in Views on Date fields throw error

This still needs a test case

Also would be helpful to have steps to reproduce this issue.

I added steps to create a view that triggers the error and is fixed with this patch.

There are two very different approaches in the patches here.

#11 has:

+    if (is_string($value)) {
+      if (strtotime($value) !== FALSE) {
+        $value = date("Y", strtotime($value));
+      }
+    }

This will convert date strings to year.

#18 has:

+    if (is_string($value)) {
+      $value = (float) $value;
+    }

This will convert a date string to to a number like 2025.0.

A patch in #3338895 has:

+    $value = round((float) $value, $precision);

Basically the same as #18, without the check for a string.

I bundled them all together and came up with this:

    if (is_string($value)) {
      if (strtotime($value) !== FALSE) {
        $value = date("U", strtotime($value));
      }
    }

    $value = round((float) $value, $precision);

Now a date string is converted to a timestamp. However, I'm not sure if this does anything for the max comparison, or if this just rendering the value afterwards.