Can I drop this dependency?

I use <package> for <what I use it for>. Here's how: <paste the usage>

Honestly: could I replace this with my own code?
- How much of the library am I actually using?
- What would the replacement look like — show me it.
- What edge cases does the library handle that I'd get wrong?
- Is it doing something genuinely hard, or something that's just
  tedious to type?

If keeping it is the right call, say so. I'm not looking to
reimplement date parsing.