How do you say/write dates?

In speech do you say "the twelfth of August" or is it "August the twelfth"? Do you write 12/8 or 8/12?

Obviously there is national differences but both speech versions are acceptable while the number form can confuse. But Do you always use the same method or switch for important dates for emphasis?
How do you say/write dates?
How do you say/write dates?
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