Fatal error caused by incorrect date format on events

[thetwopct]

If entering a non-date in an event (i.e. TBD) then the following fatal errors are thrown:

Uncaught Exception: DateTime::__construct(): Failed to parse time string (TBD) at position 0 (T): The timezone could not be
found in the database in /code/web/wp-content/themes/lfevents/library/lfe-functions.php:477 
Stack trace: #0 /code/web/wp-content/themes/lfevents/library/lfe-functions.php(477): DateTime->__construct('TBD') 
#1 /code/web/wp-content/themes/lfevents/header.php(27): lfe_insert_structured_data() 
#2 /code/web/wp/wp-includes/template.php(723): require_once('/code/web/wp-co...') 
#3 /code/web/wp/wp-includes/template.php(672): load_template('/code/web/wp-co...', true) 
#4 /code/web/wp/wp-includes/general-template.php(41): locate_template(Array, true) 
#5 /code/web/wp-content/themes/lfevents/singular.php(20): get_header() 
#6 /code/web/wp/wp-includes/template-loader.php(106): include('/code/web/wp-co...') 
#7 /code/web/wp/wp-blog-header.php(19): require_once('/code/web/wp/wp...') 
#8 /code/web/index.php(6): require('/code/web/wp/wp...') 
#9 {main} thrown

Fatal error: Uncaught Exception: DateTime::__construct(): Failed to parse time string (TBD) at position 0 (T): The timezone could not be found in the database
in /app/web/wp-content/themes/lfevents/search-filter/4480.php on line 39