(If bored) I had an dull time today.    

                   I had an uneventful day.

(Yeah, the latter have a side effect in pronounce; as occur with pay day, for example, to us Brazilian students.  But is correct indeed.)

(If glad/satisfied) I had a nice day at work.

or simply:     -How was your day dearest?

                    -Nice   (or Good, excellent   etcetera)

More comments will come, and likely, more examples.

See you later.