Profile: Sanny

Problem:
Create a custom date field, No matter what date I choose from the datepicker (custom date field in a custom post type), when I save the content it always says "Please enter a date after 1 January 1970".
Solution:
the problem is in the Types file \types\library\toolset\types\embedded\functions.php, line 737~745:

/**
 * Checks if timestamp supports negative values.
 *
 * @return type
 */
function fields_date_timestamp_neg_supported()
{
    return strtotime( 'Fri, 13 Dec 1950 20:45:54 UTC' ) === -601010046;
}

In your webserver, the strtotime( 'Fri, 13 Dec 1950 20:45:54 UTC' ) return value:
-600992046
but it should be value: -601010046

There are 5 hours (18000) between above two values (-601010046 and -600992046), which produce the problem: Types can not save the timestamp into database.

It is different value from -601010046, that means your webserver can not return the correct timestamp value, you will contact your webserver provider to correct it.
Relevant Documentation:
http://php.net/manual/en/function.strtotime.php