The day before Sunday week
The day before Sunday
Next Sunday
Sunday
Now, you may have tried putting in "Sunday" and it worked, but it didn't when I tried it.I had a leading space.
Going to the "Let use know" link takes me to a github issues reporting page. I stared at it for about 30 seconds, then decided life's too short and I'd report my findings here.
So I've made it parse some of the above, it appears that there we odd spaces, but I can't retrieve the exact cases now, so I can't really make a sensible bug report.
But it still doesn't parse "The day before Sunday week," nor "The day before a week on Sunday." It also doesn't parse "26-05-2010," the usual UK data format, but you probably knew that.
Is your test data set available?