Όποια μέρα κι αν γιορτάζεις, θα σου στείλω μήνυμα και μια κάρτα.

Όποια means whichever / whatever, and it agrees with μέρα because μέρα is a feminine noun.

So:

• όποιος = whichever/whoever (masculine)
• όποια = whichever/whoever (feminine)
• όποιο = whichever/whatever (neuter)

Because the sentence says μέρα (“day”), the feminine form όποια is used: όποια μέρα = whichever day.

This is a very common Greek pattern:

• όποια ... κι αν ...
• όπου κι αν ...
• ό,τι κι αν ...
• όποιος κι αν ...

It gives the idea of no matter which / no matter where / whatever / whoever.

So Όποια μέρα κι αν γιορτάζεις means something like:

• whichever day you celebrate
• no matter what day you celebrate on

A very important point: κι αν does not need to be translated word-for-word. It is part of the structure that creates this indefinite / concessive meaning.

Also, κι is just the shorter form of και before a vowel:

• και αν → κι αν

Greek often uses the present tense in clauses like this when talking about something general or not yet fixed.

So:

• Όποια μέρα κι αν γιορτάζεις = whichever day you celebrate
• θα σου στείλω = I will send you

The future is carried by the main clause with θα, while the subordinate clause stays in the present.

This is very natural in Greek and does not sound strange to native speakers.

It can literally mean you celebrate, but in everyday Greek this often refers to someone’s nameday.

So depending on context, Πότε γιορτάζεις; can mean:

• When do you celebrate?
• more specifically, When is your nameday?

In this sentence, the idea is likely about a person’s celebration day, very possibly their nameday.

Because σου is a weak object pronoun meaning to you / you, and in Greek these pronouns normally come before the verb.

So:

• σου στείλω = I send to you / I send you
• θα σου στείλω = I will send you

This order is very common:

• σου λέω = I tell you
• σου δίνω = I give you
• σου γράφω = I write to you

With θα, the pronoun still goes before the verb:

• θα σου στείλω

Because after θα, Greek often uses the perfective stem for a single complete action in the future.

Here:

• στέλνω = I send / I am sending
• θα στείλω = I will send

The form στείλω is not a present tense form by itself here; it is the verb form used after θα to express a future, completed action.

This is a very common Greek pattern:

• γράφω → θα γράψω
• βλέπω → θα δω
• στέλνω → θα στείλω

Greek often omits the indefinite article when the noun is being used in a more general or idiomatic way.

So θα σου στείλω μήνυμα is very natural and means:

• I’ll send you a message

Even without ένα, it still has an indefinite sense.

By contrast, μια κάρτα includes the article μια to emphasize a card / one card.

So the combination:

• μήνυμα και μια κάρτα

sounds very natural. You could also hear ένα μήνυμα και μια κάρτα, but στείλω μήνυμα is especially common as a set phrase.

It connects the two things that will be sent:

• μήνυμα
• μια κάρτα

So the structure is:

• θα σου στείλω = I will send you
• μήνυμα και μια κάρτα = a message and a card

In other words, και simply means and here.

They are related, but not always identical in feel.

• όποια μέρα κι αν... = whichever day / no matter what day
• οποιαδήποτε μέρα = any day / whichever day

In this sentence, όποια μέρα κι αν γιορτάζεις is the more natural structure because it is followed by a verb clause and means no matter what day you celebrate.

Using οποιαδήποτε would sound less natural in this exact sentence.

Greek is flexible with word order, and putting Όποια μέρα κι αν γιορτάζεις first gives emphasis to the idea no matter which day.

So the sentence highlights that the exact day does not matter.

You could also rearrange it in some contexts, but the given order is very natural and expressive.

A rough pronunciation guide:

• Όποια ≈ OH-pya
• μέρα ≈ ME-ra
• κι αν ≈ ky an
• γιορτάζεις ≈ yor-TA-zis
• θα σου στείλω ≈ tha sou STEE-lo
• μήνυμα ≈ MEE-ni-ma
• και μια κάρτα ≈ ke mia KAR-da

A couple of helpful notes:

• γι before ο sounds like y in yes, so γιορτάζεις starts roughly like yor-
• κι is pronounced like a short kee/ky
• στ in στείλω is like st

Yes. και αν and κι αν are both possible.

• και αν is the full form
• κι αν is the contracted form, very common before a vowel

So:

• Όποια μέρα και αν γιορτάζεις
• Όποια μέρα κι αν γιορτάζεις

Both are correct, but κι αν sounds especially natural in everyday Greek.

It is in the accusative singular.

That may look surprising, because in English we do not think of day as being in a special case here. But in Greek, expressions like όποια μέρα often use the accusative as an adverbial time expression, meaning something like on whatever day.

So even though there is no separate word for on, Greek can express that idea through the noun phrase itself.

That is why:

• όποια μέρα = whichever day / on whatever day

rather than a nominative-style subject phrase.