As a Quran-alone Muslim, when does Ramadan start for you in 2017?

[EdQ]

Salam All,

I have only ever performed the month long Hadithist Ramadan before.

Now I have discovered an alternate interpretation in relation to a 10 day fast - except there seems to be some subjective conclusions on whether the fast occurs before or after the 4 months after the full moon of Solstice.

I wanted to ask when you are performing your Ramadan - even if you are not actually performing your Ramdan, when it is in your interpretation as Quran-alone Muslims?

If you can share your logic I would appreciate it.

Thanks in advance
Salam
Ed