January • February • March • April • May • June • July • August • September • October • November • December
1st
- 2001: Episodes 1 and 2 of Digimon Tamers air in English for the first time.
- 2002: Episode 21 of Digimon Frontier airs in Japan for the first time.
2nd
- 2000: Episodes 5 and 6 of Digimon Adventure 02 air in English for the first time.
- 2001: Episode 22 of Digimon Tamers airs in Japan for the first time.
- 2005: Digimon World 4 is released in PAL for the PlayStation 2 and the Xbox.
3rd
- 2000: Episode 22 of Digimon Adventure 02 airs in Japan for the first time.
- 2004: Digimon Rumble Arena 2 is released in North America for the PlayStation 2 and the Xbox.
- 2006: Episode 21 of Digimon Savers airs in Japan for the first time.
4th
- 1999: Episode 4 of Digimon Adventure airs in English for the first time.
5th
- 1999: Episode 26 of Digimon Adventure airs in Japan for the first time.
- 2003: Digimon BattleSpirit is released in Europe for the Game Boy Advance.
6th
- 2004: Digimon Rumble Arena 2 is released in North America for the Nintendo GameCube.
7th
- 2013: Episode 1 of Digimon Fusion airs in the United States of America for the first time.
8th
- 1997: Digital Monster: I'll Become the Digimon King! is published in Japan for the first time.
- 2001: Episodes 3 and 4 of Digimon Tamers air in English for the first time.
- 2002: Episode 22 of Digimon Frontier airs in Japan for the first time.
9th
- 2000: Episode 7 of Digimon Adventure 02 airs in English for the first time.
- 2001: Episode 23 of Digimon Tamers airs in Japan for the first time.
- 2002: Episode 1 of Digimon Frontier airs in English for the first time.
10th
- 2000: Episode 23 of Digimon Adventure 02 airs in Japan for the first time.
- 2006: Episode 22 of Digimon Savers airs in Japan for the first time.
11th
- 1999: Episode 5 of Digimon Adventure airs in English for the first time.
12th
- 1999: Episode 27 of Digimon Adventure airs in Japan for the first time.
13th
- 2004: Digimon Racing is released in North America for the Game Boy Advance.
14th
- 2010: Episodes 10 and 11 of Digimon Xros Wars air in Japan for the first time.
- 2013: Episode 2 of Digimon Fusion airs in the United States of America for the first time.
15th
- 2001: Episodes 5 and 6 of Digimon Tamers air in English for the first time.
- 2002: Episode 23 of Digimon Frontier airs in Japan for the first time.
16th
- 2000: Episode 8 of Digimon Adventure 02 airs in English for the first time.
- 2001: Episode 24 of Digimon Tamers airs in Japan for the first time.
- 2002: Episode 2 of Digimon Frontier airs in English for the first time.
- 2005: The movie Battle of Adventurers airs in English for the first time.
17th
- 2000: Episode 24 of Digimon Adventure 02 airs in Japan for the first time.
- 2006: Episode 23 of Digimon Savers airs in Japan for the first time.
18th
- 2001: Digimon Adventure: Anode Tamer and Digimon Adventure: Cathode Tamer are released in Hong Kong for the WonderSwan and the WonderSwan Color.
- 2007: Digimon World Data Squad is released in North America for the PlayStation 2.
- 2007: Digimon World Dawn and Digimon World Dusk are released in North America for the Nintendo DS.
19th
- 1999: Episode 28 of Digimon Adventure airs in Japan for the first time.
- 2013: Episode 3 of Digimon Fusion is accidentally leaked on the Nickelodeon website.
20th
- 1999: Episode 6 of Digimon Adventure airs in English for the first time.
- 2002: Digimon Pendulum 2.0: Armageddon Army is released in Japan.
21st
- 1999: Episode 7 of Digimon Adventure airs in English for the first time.
- 1999: Chapter 11 of Digimon Adventure V-Tamer 01 is published in Japan for the first time.
- 2000: Chapter 23 of Digimon Adventure V-Tamer 01 is published in Japan for the first time.
- 2001: Chapter 35 of Digimon Adventure V-Tamer 01 is published in Japan for the first time.
- 2002: Chapter 47 of Digimon Adventure V-Tamer 01 is published in Japan for the first time.
- 2010: Chapter 4 of Digimon Xros Wars is published in Japan for the first time.
- 2011: Chapter 15 of Digimon Xros Wars is published in Japan for the first time.
22nd
- 1999: Episode 8 of Digimon Adventure airs in English for the first time.
- 2001: Episode 7 of Digimon Tamers airs in English for the first time.
- 2002: Episode 24 of Digimon Frontier airs in Japan for the first time.
23rd
- 1999: Episode 9 of Digimon Adventure airs in English for the first time.
- 2000: Episode 9 of Digimon Adventure 02 airs in English for the first time.
- 2001: Episode 25 of Digimon Tamers airs in Japan for the first time.
- 2002: Episode 3 of Digimon Frontier airs in English for the first time.
24th
- 1999: Episode 10 of Digimon Adventure airs in English for the first time.
- 2000: Episode 25 of Digimon Adventure 02 airs in Japanese for the first time.
- 2003: Digimon BattleSpirit 2 is released in North America for the Game Boy Advance.
- 2006: Episode 24 of Digimon Savers airs in Japanese for the first time.
25th
- 1999: Episode 11 of Digimon Adventure airs in English for the first time.
26th
- 1999: Episode 29 of Digimon Adventure airs in Japan for the first time.
27th
Nothing is currently known to have happened on this day.
28th
Nothing is currently known to have happened on this day.
29th
- 2001: Episodes 8 and 9 of Digimon Tamers air in English for the first time.
- 2002: Episode 25 of Digimon Frontier airs in Japan for the first time.
30th
- 1999: Episode 12 of Digimon Adventure airs in English for the first time.
- 2000: Episode 10 of Digimon Adventure 02 airs in English for the first time.
- 2001: Episode 26 of Digimon Tamers airs in Japan for the first time.
- 2002: Episode 4 of Digimon Frontier airs in English for the first time.
- 2017: Episode 52 of Digimon Universe: Appli Monsters airs in Japan for the first time.