Question: I am writing a technical document and I need to refer to the current point of time. Should I say 'at the time of writing', 'at the time of this writing', or 'at the time of writing this'? Are all acceptable?

Answer: 
While all will be understood, the convention in this situation is to use "at the time of writing".

Alternatively you could say "as of October 2014".

> 
> "At the time of writing we had just declared war with IS."
> 
> 
> "As of October 2014 the tax rate is 20%."
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> 
>
I would suggest that it line up with the acronym for this phrase: [Acronym of abbreviation for "At the time of writing this document"?](https://english.stackexchange.com/questions/422116/acronym-of-abbreviation-for-at-the-time-of-writing-this-document)

> 
> **ATTOW**
> 
> 
> 

Which is exactly how [the answer](https://english.stackexchange.com/a/199392/232142) is written.