En su día

[LearningSpanish]

Does this have a set meaning or is it quite flexible ie. can it refer to the future and the past.

I think in the case I read it translates (loosely) to 'had already' or something like that.

Pues en su día se le anunció que allí lo esperaban cadenas y tribulaciones.

But on the other hand I'm pretty sure I've also seen it used where it could be translated as 'eventually' referring to the future.

Gracias como siempre para tus comentarios.

[aleCcowaN]

... en su día
... en su momento
... en su oportunidad
... a su tiempo

You are right about something having been done "in the moment it was done, an opportune moment ... or not quite"

[JPablo]

I agree...
It can be translated as "in due course" (later on) or "in its day" or "in its time".