I didn't notice continuity issues in the show's timeline until I read discussion boards on this website. Since then I've been searching on tumblr, more discussion boards and rewatching the show myself to piece something together and still no luck getting one whole picture. And I've read somewhere that Astruc (and other cartoon directors) doesn't put specific dates for multiple reasons. Usually a show just puts out episodes in Season 1 to see if the show gets its views to renew it for future seasons, so a good majority of those episodes don't matter to the plot and don't need a consistant timeline. I,on the other hand, need one to keep me from going crazy. I've studied the flaws and looked for ANY small detail in each 22 minute episode to throw a season 1 timeline together and this is what I got so far:
Miraculous Season 1 Episode Timeline
Origins Pt. 1 (S1EP15) - September ??
-Continuity issue with Alya’s blog posts (blog date April 27)
Origins Pt. 2 (S1EP16) - September ??
The Bubbler (S1EP1) - September 8
-Adrien’s theoretical birthday
Copycat (S1EP5) - September ??
Lady Wifi (S1EP7) - September 30
-Chloe comments on someone’s outfit saying it’s a month until Halloween
-Ladybug makes a joke referring to Copycat
A Christmas Special - December 24
Dark Cupid (S1EP10) - February 14
Timebreaker (S1EP4) - April 6
-refers to the Adrien schedule where this date has “Roller Time” written in
ROGERCOP (S1EP9) - April ??
-advertisement for weather girls on bus
-Marinette’s dad refers to the Eiffel Tower cake in Timebreaker
^ANIMAN (S1EP17) - April ??
-speculation that Nino starts having a crush on Marinette during career day in Rogercop due to the wink he gives her during her father’s presentation
EVILLUSTRATOR (S1EP8) - April ??
-speculation that Chat Noir (Adrien) is flirting with Marinette before her “date” with Nathanial which would be a horrible thing to do if Nino was still crushing on Marinette = after Animan
The Puppeteer (S1EP24) - before/on April 18
-poster for play running between March 15 and April 18
-end of episode, seen visiting panther exhibit (after Animan)
-advertisement for weather girls at TV Station
The Mime (S1EP13) - April 28
-date shown on poster
PIXELATOR (S1EP19) - April ??
-Jagged Stone's first appearance
^GUITAR VILLAIN (S1EP20) - April ??
ANTIBUG (S1EP25) [no clear time period] {before/after Guitar Villain}
-flashback shows Jagged Stone giving an exclusive interview about his upcoming album which could be the same one as the one in Guitar Villain
Mr. Pigeon (S1EP2) - May 18
-powerpoint with design contest info shows date
Gamer (S1EP22) - May 18
-advertisement for video game festival running between May 18 and May 21 (assume episode is on the first day)
-first time Adrien goes to Marinette's house
KUNG FOOD (S1EP21) [no clear time period {after Gamer}]
-Adrien knows where Mariette lives already
The Pharaoh (S1EP6) - May 21
-Alya’s ladyblog upload has date*
Darkblade (S1EP12) - May 21 & May 22
-TV news shows date at beginning of episode
-akuma attack same day, class takes rep vote the next day
Stormy Weather (S1EP3) - June 21
-Stormy makes a statement about the weather forecast for the first day of summer
Horrificator (S1EP11) - June ??
-based off previous annual film festivals held in Paris
SIMON SAYS (S1EP18) [no clear time period {after The Pharaoh/Darkblade}
-Pharoah has an opening scene with Ladybug hanging from her yoyo attached to a helicopter
-when Marinette is asked about where she was during Monday's PE class, she has a flashback to her as Ladybug with a helicopter in the background
REFLECKTA (S1EP23) [no clear time period]
-class picture day
PRINCESS FRAGRANCE (S1EP14) [no clear time period]
VOLPINA (S1EP26) [no clear time period]
-student’s comments refer to Princess Fragrance, Horrificator and Jagged Stone’s new album (first seen in Guitar Villain)
-Continuity issues with Alya’s blog
- Alya’s blog post seem to always be on May 21 (exception is the origin episodes which were dated for April)
- in almost every episode, there’s a poster for a Rock Festival being held in late September