Is it 12 months from the date of purchase?

是从购买之日算起12个月吗？

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Watches are under warranty for twelve months from the date of purchase.

石英表自购买之日起保修十二个月。

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The projector is fully guaranteed for three years from the date of purchase.

承诺从购买日期起为期三年的质保。

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If the charges were not completely paid by the specified dates, then interest would be charged to the credit card account in an amount computed from the date of purchase.

FORBES: Avoiding Excess Credit Card Interest Should Not Be A Taxable Event

In order to determine the true amount of real income when a capital asset is sold, it would be necessary to index the purchase price for the inflation that occurred between the date of purchase and sale.

FORBES: Musings on Warren Buffett's Tax Disclosure

It was a passing remark and I did not ask him about the date of his purchase or the extent of his holdings.

WSJ: The Intelligent Investor: Would You Trade on Inside Information, Too?