6

In English you can meet
at a time (We will meet at 4pm.)
on a date (We will meet on the 4th.)
or be on time.

Esperanto doesn't seem to have quite the same rules. Is it en a date and je a time? What about being "on time" ?

5

In general you use je for a time and the -n suffix for a date. Eg:

Ni renkontiĝu je la 4a posttagmeze / je la 16a → Let’s meet at 4pm

Ni renkontiĝu la 4an (de januaro) → Let’s meet on the 4th (of January)

There is more detailed information about times and dates in PMEG.

I think you would only use en if you are talking about a non-specific point within a certain time range. Eg,

Ni renkontiĝu en januaro → Let’s meet (at some point) in January

PMEG has some information about this too.

For “on time” you can say ĝustatempe.

Venu ĝustatempe aŭ ni maltrafos la komencon de la filmo.

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1

Both je and the accusative -n (without preposition) are correct for specific points in time, indiscriminate for times and dates. The accusative also for other prepositions like dum. The preposition en is used too, for a point inside a larger range.

esti ĝustatempe = to be on time

dum la oka de marto ne forgesu gratuli vian edzinon = on the 8th of March do not forget
                                                      to wish your wife well
dum la tria horo ili dormis = they slept around three

The preposition dum for what actually is a period.

dum la semajno = in/during the week
en la semajno = at some point in the week

The usage of dum seems preferable, but en is found too. The distinction above I just made up, and is not prescriptive.

Other prepositions:

post tempo = in time all will become alright
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