My second is performed by my first and it is thought a thief by the marks of my whole might be caught. What am I?

Answer

More What am I Riddles

What Day

Alice is walking throught the forest of forgetfulness. She wants to know what day of the week it is. She stops and asks a lion and a unicorn. Now the lion lies all of the time on Monday Tuesday and Wednesday. The unicorn always lies on Thursday Friday and Saturday.Alice asks the lion what day it is he says "Well yesterday was one of my lying days." Alice can"t figure it out just from the lion"s answer so she asks the unicorn and the unicorn says "Yesterday was also one of my lying days." What day is it?"