"Είναι Δευτέρα."

Translation: It is Monday.

[deactivated user]

Δεν μου αρέσει Δευτέρα

[YPSILONZ]

You should use the definite article in this: Δε μου αρέσει η Δευτέρα (I also dropped the ν in δεν because the next word starts with μ and it flows better, but even with ν it's not unheard of).

[igugu7]

it's funny how sad is the voice saying "monday" compared to the other days

[JanuszWoro3]

Day two