How to know if an iTunes gift card has been used?

May i want to know this card used redeem code Apple ID date and time

Nobody know.

See this Apple article:  If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card

If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card - Apple Support

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Card has already been redeemed

If you see a message that says that your card has already been redeemed, you might have already redeemed it. Sign out of the App Store or iTunes Store on all of your devices, then sign back in. This refreshes your Apple Account balance. Learn how to check your Apple Account balance.

If you need more help, contact Apple Support.

Beware of -> About Gift Card Scams -> About Gift Card Scams - Official Apple Support 

If you still need help, get more help and assistant from Apple directly, see Contact Apple for support and service -> Contact Apple for support and service – Apple Support (UK) 

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If you have a valid payment method on file, instead of buying or order an App Store & iTunes gift card, you can Add money to your Apple Account balance anytime, no gift card needed, see -> Apple Gift Card - Apple (UK)

The balance on an iTunes Store gift card itself is either what it says on the face of the card (if present), or nothing because it has already been redeemed. The only way to check is to try redeeming the card and check your store balance. Of course that will transfer any balance on the card entirely to your Apple ID so then the card balance will be zero.

Redeem your App Store & iTunes Gift Card - Apple Support - How to redeem your Apple Gift Card or App Store & iTunes gift card - Apple Support