How to find my Mac's purchase date?

Hi,

To find your Mac's purchase date, use the serial number on the Apple Check Coverage website or log into My Support(mysupport.apple.com). Alternatively, check your email for the original receipt, use the Apple Store app, or check your Apple ID account page. 

How did you pay for it? Check your checking account records or your credit card accounts.

"How to find my Mac's purchase date?: I am trying to find the purchase date of my Mac. I can't find the receipt for it and need the day I ordered it."

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Try Using Spotlight Search:

[Hold down command + press spacebar]. Next type a keywords or key phrase such as receipt, invoice, total, purchase, apple, invoice

Screenshot:

How long ago did you buy? Invoices generally only remain accessible from your Apple Account/Apple ID for about 18 months.

DId you buy directly from Apple or for a reseller?