Thank you for your reply,
so this happened with me using both versions of Hikashop (3.3.0\3.2.2 )so maybe I'm missing something,
I want to customize the products to be suitable for a (tour product) so I will have to add many custom fields, some of them are text written by me, others to be filled by the client on the front end before check out and on check out.
steps I took : create custom field > go to product page and add the content > buy the product and checkout of shopping cart> receive the email.
I did not do any customization to the email templates, they are the default ones.
in Version 3.3.0 if I used a date field with a simple calendar selector this scenario would happen:
I add the date at the back end and it displays the field name and content on the front end, thats great, but, If I later on delete the content of the field in the back end the front end still displays the field name and the content is just zeros 00:00:00:00:00 which I don not want to appear in the front end because there is not a set date for the tour.