Hi,
To display the custom field, you have to use the HikaShop field class and call the "show" function with the field object.
You can't use a raw value like that with the custom fields.
The date is stored in a fixed format in order to be displayed dynamically.
The other date custom field store the pre-formated date in the database, so it does not allow you to sort or filter easily (depending the format you use).
The "pro" is that you can display the raw value from the database, the "con" is that you can't change the format or use it in code/sql.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.