Charitable donations can still be entered as a deduction when you prepare your tax return next year for 2018, which you will file in 2019. It will be harder to get the deduction, since your standard deduction will be higher under the new tax laws that will be in effect.
A charitable donation almost never changes your tax due or refund all by itself. First, your donation does not count "dollar for dollar"--it is calculated by a percentage based on your tax bracket. You need a LOT of other itemized deductions like mortgage interest or property taxes, medical expense, etc. to itemize and exceed your standard deduction.
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