Lion lies every Monday, Tuesday and Wednesday whereas unicorn lies on Thursdays, Fridays and Saturdays...

Question

Alice came across a lion and a unicorn in a forest of forgetfulness.
The lion lies every Monday, Tuesday and Wednesday
and the other days he speaks the truth.
The unicorn lies on Thursdays, Fridays and Saturdays,
and the other days of the week he speaks the truth.

Lion : Yesterday I was lying.

Unicorn : So was I.

Which day did they say that ?

Answer 1

It must be Thursday.
On Thursday lion will say the truth about him lying on Wednesday and
Unicorn will lie about it lying on Wednesday.

Answer 2

They made the declaration on Thursday