excel formula - Need to return a blank -


i enter date in a1 , simple a1+21 in a2 give me 3 week ahead date.

it uses date in a2 calculate number of other values in other cells

however if havent put date in a1, need return blank in a2 rather 21/01/1900.

i'm quite new excel , learning how do various things functions, have feeling 1 simple cant see or work out how it

you can use if(isblank(a1),"",a1+21)


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