Its stuck on September? laaaaame

Use program called VTFEdit to unpack texture to .tga file.
Once you're satisfied how new page looks like from source file, place it in a layer over base texture and scale it until it roughly fits over the area where page is located in the base texture. Use red outline as guide. Some erasing/ masking is required for seamless edit (few more things can be done at this stage but these are basics).
Once you're finished export new texture to .tga and pack it back to .vtf using VTFEdit.

The texture... I think

Which files exactly? Source, texture or both?

This is embarrassing for me to ask, but... HOW do you edit the files, exactly?

I see. Well, it's not a priority for me to use them either, so take your time.

I couldn't find my backup source files for those . I might remake and add them in a future update but that's just not top priority right now. Sorry.

I may be late in posting this, but I noticed how in the entry there are several torn papers from the calendar. Will those be released later? (They could be useful for a "a lot of time passed" montage or something of the sort.)

Sumotuwethfrsa

FNAF is for pussies.

Is this a FNAF reference? Because birthdays are usually marked in calendars. And you know where people sometimes celebrate their birthday? Exactly, in a pizzeria. FNAF mostly occurs in a pizzeria, so Calendar = FNAF reference confirmed.

@Prince Justyce, dang, maybe you actually are autistic just like you said

No this is not related to FNAF in any way...

"Hey guys! I have a question! Is a general phrase BEFORE FNAF, a FNAF reference????"

Is The Entry A FNAF 2 Reference? There's A FNAF 2 Song Called "Behind The Mask"