Il est six heures et demie.

French uses il est to tell the time, just as English uses it is.

• Il here does not refer to a person.
• It is an impersonal expression: Il est six heures = It is six o’clock.

So when talking about clock time, il est is the normal pattern.

In French, the hour is usually expressed with the noun heure:

• Il est une heure = It is one o’clock
• Il est deux heures = It is two o’clock
• Il est six heures = It is six o’clock

So French normally says the equivalent of it is six hours, not just it is six.

Because the number is more than one.

• une heure = one hour
• deux heures, trois heures, six heures = plural

So six heures is plural for the same reason English has six hours.

Because heure is a feminine noun, and in this time expression demi agrees with it.

• une heure et demie
• six heures et demie

So the feminine form demie is used.

Because the sentence means six hours and a half, not six half-hours.

Only one half-hour is being added, so demie stays singular:

• six heures et demie = six thirty / half past six

So:

• heures is plural because there are six hours
• demie is singular because there is only one half

French expresses this differently.

English says:

• half past six

French says:

• six hours and a half → six heures et demie

So French does not need a separate word meaning past here. It simply adds et demie after the hour.

Yes. Il est six heures trente is also correct.

Both mean 6:30:

• Il est six heures et demie
• Il est six heures trente

A rough difference:

• et demie often sounds a bit more natural in everyday speech
• trente can sound a bit more exact, digital, or schedule-like

But both are completely normal.

Because French normally uses il est for clock time, not c’est.

• Correct: Il est six heures et demie.
• Not the normal way to tell time: C’est six heures et demie.

Use c’est for identifying something, and il est for telling the time.

The important point is that six changes sound before a vowel.

By itself, six is often pronounced roughly like sees. But before heures, the final x is pronounced like a z sound:

• six heures → roughly see-zur

So the full sentence is pronounced approximately:

• eel eh see-zur ay duh-MEE

That z sound between six and heures is something learners often notice.

No. By itself, Il est six heures et demie could mean 6:30 AM or 6:30 PM.

If you want to be more specific, French can add:

• du matin = in the morning
• de l’après-midi = in the afternoon
• du soir = in the evening

For example:

• Il est six heures et demie du matin.
• Il est six heures et demie du soir.

Mostly yes, but there are small changes.

• 1:30 → Il est une heure et demie
• 12:30 → Il est midi et demi
• 12:30 at night → Il est minuit et demi

The interesting part is:

• with heure (feminine), you get demie
• with midi and minuit (masculine), you get demi

So the pattern stays similar, but agreement changes depending on the noun.