[Idiom] on another day

[Will17]

Hello,

Does the expression "on another day" exist? (eg: We'll talk about this on another day.)

Does the expression "on those days" exist? (eg: On those days, people were not very happy.)

Thank you
W

 

[Rover_KE]

Delete on, and both expressions are fine.

Rover

 

[billmcd]

And, "in those days" is also used.