No valid from date on credit card?

Spark

I got my new Paypal credit card, and just realised that there is no valid from date on the card, only the expires end date. First time it happened, all my cards so far had both dates. Now, when I buy online, both the valid from and expires end date are asked before processing the payment.
Will I have some difficulties buying online with this card because of the absence of the valid from date?

PBA

One of the brands of credit cards (can't remember which one, think it's Mastercard) tend not to have a valid from date. Just leave it blank, transactions will still go through.

taless

The valid from date is only essential to Switch/Solo cards that do not have an issue number. For others (Mastercard, VISA, Amex) I dont think it is necessary.

I recall Amex is the card that does not have a valid from date, only "Member Since".