Where can I find the purchase date of my current MacBook Air?

Apple menu > About this Mac will give you the model information. In terms of how long a Mac will be supported in terms of software updates, etc., that information is what matters, not the actual date of purchase.

Look for an email containing an Invoice from no_reply@email.apple.com in your Apple ID email.

If you are the original owner then go through your email for an invoice you may have received after making the purchase and if you are not, ask the original owner.

f it was from Apple Store you would have received the invoice on your email, provided by you to them while making the purchase.

With online Order Status you can Print an Invoice

Log into Apple

1. Click on the bag icon as shown in the above
2. Click on Sign in
3. Click on Orders
4. Click on the items that you want an invoice for.
5. Click on View Invoice under the Order Number Top right-hand corner. See the pic below...

There you have it.

Apple Menu > About This Mac or System Settings > General > About