hi does anybody know is there a cutoff date in when we have to convert suitescript 1.0 to 2.x ?

I've seen no dates even suggested for retiring SS 1.0.

It'll never happen. Too much code out there. All that may happen is that 2.x will continue to evolve, along with new 2.x specific tooling, leaving 1 further and further behind

Yes, NS has said they are adding no new features to SS1 - it's just sitting to rot on the vine.