Bonjour
Il est trois heures de l'après-midi.
it's three in the afternoon.
Step-by-step explanation
Il est vingt-trois heures = it's twenty three = in French it's eleven p.m.
il est trois heures de l'après-midi = it's three in the afternoon
Il est quinze heures = it's fifteen = in French it's three (p.m.) (so you don't need to say "in the afternoon")
it's une heure de l'après-midi = it's one in the afternoon.
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When you say hours from treize to vingt-trois (13-> 23) you don't need to add "in the afternoon", "in the evening" ....
you can't say "it's quinze heures de l'après-midi"....
il est quinze heures = il est trois heures de l'après-midi (3 p.m.)
OR
you can't say "il est vingt-trois heures du soir"...
il est vingt-trois heures = il est onze heures du soir. (23 p.m.)
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hope this helps ☺☺☺