is it still safe to use in 2021 as of May , it shows a lot of warnings.

[sagartmg]

[codercodingthecode]

I wouldn't bet on a prod app with this current status. Lib is kinda left out.
That's why there are so many forks. It does make a good base lib. Best to fork and do what you got to or use some of the other forked branches.
We had to fork as well to do our work with another time lib and add accessibility.
However, we are grateful to the authors to provide us with a good starting point.

[sushantdhiman]

I was using this library for my project and due to outdated dependencies, I was looking for an alternative. Drop-down based approach this library used feels natural to me. After looking at multiple forks, I decided to migrate this library to TypeScript. I have also mixed accessibility support from time-picker-io.

If you are looking for an alternative with similar API, you can use my fork https://github.com/sushantdhiman/react-samay