نه، یادم نیست، اما یادم هست که آن را در تقویم گوشی گذاشتم.

Literally, یادم نیست means something like it is not in my memory.

It is built from:

• یاد = memory, remembrance
• ـم = my
• نیست = is not

So یادم نیست = my memory of it is not there / I don’t remember.

In Persian, remembering is often expressed with یاد rather than with a direct equivalent of the English verb to remember. This is very natural and common.

They are opposites:

• یادم نیست = I don’t remember
• یادم هست = I remember

Both use the same structure with یاد:

• یادم = my memory / in my memory
• هست = is
• نیست = is not

So in the sentence:

• نه، یادم نیست = No, I don’t remember
• اما یادم هست که... = but I do remember that...

This kind of contrast is very common in Persian.

The ـم is a clitic pronoun meaning my.

So:

• یادم = my memory / I remember
• یادت = your memory / you remember
• یادش = his/her memory / he/she remembers

Examples:

• یادم هست = I remember
• یادت هست؟ = Do you remember?
• یادش نیست = He/She doesn’t remember

This is a very useful pattern to learn.

نه simply means no and is the most basic, neutral way to say it.

• نه = no
• نخیر = no (often a bit firmer, sometimes more formal or emphatic depending on tone)

So نه، یادم نیست is a very natural conversational way to say:

No, I don’t remember.

اما means but.

So the sentence is structured as:

• نه، یادم نیست = No, I don’t remember
• اما یادم هست که... = but I do remember that...

It introduces a contrast:

• the speaker does not remember one thing,
• but does remember another thing.

Here که works like that in English.

So:

• یادم هست که آن را... گذاشتم = I remember that I put it...

In spoken English, that is often omitted:

• I remember I put it...

Persian often uses که to introduce the clause after verbs like know, remember, say, etc.

آن means that or it, depending on context.

را marks a specific direct object.

So:

• آن را = that / it as the object of the verb

In this sentence, it refers to something already known from context:

• یادم هست که آن را... گذاشتم = I remember that I put it...

About را:

• It is used with definite/specific direct objects.
• In speech, را is often pronounced ro.

Examples:

• کتاب را خواندم = I read the book
• آن را دیدم = I saw it / I saw that

Yes: in pronunciation there is an ezafe sound between the nouns, even though it is usually not written.

So تقویم گوشی is pronounced:

• taqvim-e guši

This means:

• تقویم = calendar
• گوشی = phone
• تقویمِ گوشی = the phone’s calendar / calendar of the phone

With در:

• در تقویم گوشی = in the phone calendar

This missing-but-pronounced -e- link is extremely common in Persian writing.

Here گوشی means phone, especially mobile phone / cell phone in modern everyday Persian.

So:

• تقویم گوشی = phone calendar
• more naturally in English: the calendar on my phone

Depending on context, گوشی can also mean things like a handset/receiver, but in modern daily conversation it very often means mobile phone.

Yes, گذاشتم literally means I put.

But Persian often uses گذاشتن in a broader way than English put. In this context:

• آن را در تقویم گوشی گذاشتم literally: I put it in the phone calendar naturally: I entered it in my phone calendar / I put it in my phone calendar

So this is a normal Persian way to talk about adding something to a calendar, list, schedule, etc.

گذاشتم is the simple past of گذاشتن.

Breakdown:

• گذاشت = put
• ـم = I

So:

• گذاشتم = I put

In the sentence:

• یادم هست که آن را در تقویم گوشی گذاشتم = I remember that I put it in the phone calendar

Because the sentence is specifically about memory, not general knowledge.

Compare:

• یادم نیست = I don’t remember
• می‌دانم = I know

The speaker is saying:

• I don’t remember [the thing directly],
• but I do remember that I put it in my phone calendar.

So the repetition of یادم is deliberate and natural.

It is fairly natural and neutral, and it sounds fine in conversation.

A few notes:

• نه، یادم نیست is very conversational and common.
• اما is perfectly normal, though in speech many people might also say ولی for but.
• آن را is correct, but in everyday speech people might often say اونو instead.

A more colloquial version might be:

• نه، یادم نیست، ولی یادم هست که اونو توی تقویم گوشی گذاشتم.

But the original sentence is absolutely correct and natural.

A natural pronunciation would be roughly:

• na, yâdam nist, ammâ yâdam hast ke ân-o dar taqvim-e guši gozâštam

A few pronunciation notes:

• یادم = yâdam
• نیست = nist
• هست is often pronounced clearly, though in fast speech it can reduce a bit
• آن را in careful speech is ân râ, but in everyday speech often sounds more like ân-o
• تقویم گوشی is pronounced taqvim-e guši because of the ezafe

Yes. A very common spoken version would be:

• نه، یادم نیست، ولی یادم هست که اونو توی تقویم گوشیم گذاشتم.

Some differences:

• ولی instead of اما = but
• اونو instead of آن را = it/that
• توی instead of در = in
• گوشیم = my phone

That version sounds more like everyday spoken Persian, while your original sentence is a bit more neutral/written.