It's a really great calculator for all sorts of stuff.

I use many of the following almost daily:

- currency conversion: `x USD to EUR` or `BTC to USD`

- time calculations: `now - 27 hours`

- unix epoch conversion: `timestamp(now - 3 days)`, also `stamptodate()`

- unit conversion: `34 oC to oF`

and more.

Works really nicely with https://github.com/svenstaro/rofi-calc