"The Date of today is sixth april two thousand and nineteen" should also be accepted.

today's date is 6 april two thousand and nineteen should be accepted

Would be nice if it accepted 2019 instead of having to write out the full words for the year, since it lets you use numerals for most exercises involving numbers in English

In UK english, we would typically phrase this as 'twenty nineteen'. It's a valid answer, and common usage - should be accepted.

UK spoken English is not April six but April the sixth.

"Today's date is 6 April 2019" should be accepted.

The author has never been to England!

The hardest part of Duolingo is guessing the bad English required for the exercises . I hope Romanian people are not using this.