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"Meses" is a form of "mesar", a transitive verb which is often translated as "to tear". "Días" is a form of "día", a noun which is often translated as "day". Learn more about the difference between "meses" and "días" below.
mesar(
meh
-
sahr
)A transitive verb is a verb that requires a direct object (e.g., I bought a book.).
mesarse
A pronominal verb always uses a reflexive pronoun. (e.g., Te ves cansado.).
a. to pull at one's hair
El paciente psiquiátrico tenía la manía de mesarse el cabello.The psychiatric patient pulled at his hair compulsively.
el día(
dee
-
ah
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a. day
Estoy en el restaurante en donde comimos el otro día.I'm at the restaurant where we ate the other day.
2. (daylight)
a. day
Los que trabajan en el turno de noche tienen que dormir de día.Night workers have to sleep during the day.