January • February • March • April • May • June • July • August • September • October • November • December
1st
- 1999: Episode 24 of Digimon Adventure airs in English for the first time.
- 2000: Episode 26 of Digimon Adventure 02 airs in Japan for the first time.
- 2006: Episode 25 of Digimon Savers airs in Japan for the first time.
- 2007: Episode 1 of Digimon Data Squad airs in English for the first time.
- 2016: Episode 1 of Digimon Universe: Appli Monsters airs in Japan for the first time.
- 2016: Chapter 1 of Appli Monsters: Appmon Academy!! is published in Japan for the first time.
2nd
- 1999: Episode 14 of Digimon Adventure airs in English for the first time.
- 2002: The album Digimon Frontier Character Song Collection: Salamander is released in Japan for the first time.
- 2005: The movie Digimon Tamers: Runaway Locomon airs in English for the first time.
3rd
- 1999: Episode 30 of Digimon Adventure airs in Japan for the first time.
4th
- 1999: Episode 15 of Digimon Adventure airs in English for the first time.
5th
- 1999: Episode 16 of Digimon Adventure airs in English for the first time.
- 2001: Digimon Tamers: Battle Spirit is released in Japan for the WonderSwan Color.
- 2007: Episode 2 of Digimon Data Squad airs in English for the first time.
- 2013: Episode 3 of Digimon Fusion airs in the United States of America for the first time.
6th
- 1999: Episode 17 of Digimon Adventure airs in English for the first time.
- 2000: Digimon: The Movie is released in North America.
- 2001: Episodes 10 and 11 of Digimon Tamers air in English for the first time.
- 2002: Episode 26 of Digimon Frontier airs in Japan for the first time.
7th
- 1999: Episode 18 of Digimon Adventure airs in English for the first time.
- 2000: Episode 11 of Digimon Adventure 02 airs in English for the first time.
- 2001: Episode 27 of Digimon Tamers airs in Japan for the first time.
- 2002: Episode 5 of Digimon Data Squad airs in English for the first time.
8th
- 1999: Episode 19 of Digimon Adventure airs in English for the first time.
- 2000: Episode 27 of Digimon Adventure 02 airs in Japan for the first time.
- 2006: Episode 27 of Digimon Savers airs in Japan for the first time.
- 2007: Episode 3 of Digimon Data Squad airs in English for the first time.
- 2016: Episode 2 of Digimon Universe: Appli Monsters airs in Japan for the first time.
9th
- 1999: Episode 20 of Digimon Adventure airs in English for the first time.
10th
- 1999: Episode 31 of Digimon Adventure airs in Japan for the first time.
11th
- 2008: Episode 44 of Digimon Data Squad airs in English for the first time.
12th
- 2008: Episode 45 of Digimon Data Squad airs in English for the first time.
13th
- 2001: Episode 12 of Digimon Tamers airs in English for the first time.
- 2002: Episode 27 of Digimon Frontier airs in Japan for the first time.
- 2013: Episode 4 of Digimon Fusion airs in the United States of America for the first time.
14th
- 2000: Episode 12 of Digimon Adventure 02 airs in English for the first time.
- 2001: Episode 28 of Digimon Tamers airs in Japan for the first time.
- 2002: Episode 6 of Digimon Data Squad airs in English for the first time.
- 2019: Digimon Universe App Monsters is available with English subtitles for the first time on streaming service Crunchyroll.
15th
- 2000: Episode 28 of Digimon Adventure 02 airs in Japan for the first time.
- 2007: Episode 4 of Digimon Data Squad airs in English for the first time.
- 2016: Episode 3 of Digimon Universe: Appli Monsters aris in Japan for the first time.
16th
- 1999: Episode 21 of Digimon Adventure airs in English for the first time.
17th
- 1999: Episode 32 of Digimon Adventure airs in Japan for the first time.
- 2002: Episode 32 of Digimon Frontier airs in Japan for the first time.
18th
Nothing is currently known to have happened on this day.
19th
Nothing is currently known to have happened on this day.
20th
- 2001: Episode 13 of Digimon Tamers airs in English for the first time.
- 2002: Episode 28 of Digimon Frontier airs in Japan for the first time.
- 2013: Episode 5 of Digimon Fusion airs in the United States of America for the first time.
21st
- 1999: Chapter 12 of Digimon Adventure V-Tamer 01 is published in Japan for the first time.
- 2000: Episode 13 of Digimon Adventure 02 airs in English for the first time.
- 2000: Chapter 24 of Digimon Adventure V-Tamer 01 is published in Japan for the first time.
- 2001: Episode 29 of Digimon Tamers airs in Japan for the first time.
- 2001: Chapter 36 of Digimon Adventure V-Tamer 01 is published in Japan for the first time.
- 2002: Episode 7 of Digimon Frontier airs in English for the first time.
- 2002: Chapter 48 is published in Japan for the first time.
- 2010: Chapter 5 of Digimon Xros Wars is published in Japan for the first time.
- 2011: Chapter 16 of Digimon Xros Wars is published in Japan for the first time.
22nd
- 2000: Episode 29 of Digimon Adventure 02 airs in Japan for the first time.
- 2006: Episode 28 of Digimon Savers airs in Japan for the first time.
- 2007: Episode 5 of Digimon Data Squad airs in English for the first time.
23rd
- 1999: Episode 22 of Digimon Adventure airs in English for the first time.
- 2005: The movie Island of Lost Digimon airs in English for the first time.
24th
- 1999: Episode 33 of Digimon Adventure airs in Japan for the first time.
25th
- 2008: Episode 46 of Digimon Data Squad airs in English for the first time.
26th
- 2008: Episode 47 of Digimon Data Squad airs in English for the first time.
27th
- 2001: Episode 14 of Digimon Tamers airs in English for the first time.
- 2002: Episode 29 of Digimon Frontier airs in Japan for the first time.
- 2013: Episode 6 of Digimon Fusion airs in the United States of America for the first time.
28th
- 2000: Episode 14 of Digimon Adventure 02 airs in English for the first time.
- 2001: Episode 30 of Digimon Tamers airs in Japan for the first time.
- 2002: Episode 8 of Digimon Frontier airs in English for the first time.
29th
- 2000: Episode 30 of Digimon Adventure 02 airs in Japan for the first time.
- 2006: Episode 29 of Digimon Savers airs in Japan for the first time.
- 2007: Episode 6 of Digimon Data Squad airs in English for the first time.
30th
- 1999: Episode 23 of Digimon Adventure airs in English for the first time.
31st
- 1999: Episode 34 of Digimon Adventure airs in Japan for the first time.