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1st
Nothing is currently known to have happened on this day.
2nd
- 1999: Episode 9 of Digimon Adventure airs in Japan for the first time.
3rd
Nothing is currently known to have happened on this day.
4th
- 2002: Episode 44 of Digimon Tamers airs in English for the first time.
5th
- 2001: Episodes 45 and 46 of Digimon Adventure 02 air in English for the first time.
- 2002: Episode 5 of Digimon Frontier airs in Japan for the first time.
- 2008: Episode 29 of Digimon Data Squad airs in English for the first time.
6th
- 2000: Episode 49 of Digimon Adventure airs in English for the first time.
- 2001: Episode 6 of Digimon Tamers airs in Japan for the first time.
7th
- 2000: Episode 6 of Digimon Adventure 02 airs in Japan for the first time.
- 2006: Episode 6 of Digimon Savers airs in Japan for the first time.
8th
Nothing is currently known to have happened on this day.
9th
- 1999: Episode 10 of Digimon Adventure airs in Japan for the first time.
10th
Nothing is currently known to have happened on this day.
11th
- 2002: Episodes 45 and 46 of Digimon Tamers air in English for the first time.
- 2003: Episode 37 of Digimon Frontier airs in English for the first time.
12th
- 2001: Episodes 47 and 48 of Digimon Adventure 02 air in English for the first time.
- 2002: Episode 6 of Digimon Frontier airs in Japan for the first time.
- 2003: Episode 38 of Digimon Frontier airs in English for the first time.
- 2008: Episode 30 of Digimon Data Squad airs in English for the first time.
13th
- 2000: Episode 50 of Digimon Adventure airs in English for the first time.
- 2003: Episode 39 of Digimon Frontier airs in English for the first time.
14th
- 2000: Episode 7 of Digimon Adventure 02 airs in Japan for the first time.
- 2003: Episode 40 of Digimon Frontier airs in English for the first time.
- 2006: Episode 7 of Digimon Savers airs in Japan for the first time.
15th
- 2001: Episode 7 of Digimon Tamers airs in Japan for the first time.
- 2003: Episode 41 of Digimon Frontier airs in English for the first time.
16th
- 1999: Episode 11 of Digimon Adventure airs in Japan for the first time.
- 2003: Episode 42 of Digimon Frontier airs in English for the first time.
17th
Nothing is currently known to have happened on this day.
18th
- 2002: Episodes 47 and 48 of Digimon Tamers air in English for the first time.
19th
- 2001: Episodes 49 and 50 (the final episode) of Digimon Adventure 02 air in English for the first time.
- 2001: Digimon World 2 is released in North America for the PlayStation.
- 2002: Episode 7 of Digimon Frontier airs in Japan for the first time.
- 2008: Episode 31 of Digimon Data Squad airs in English for the first time.
20th
- 2000: Episodes 51 and 52 of Digimon Adventure air in English for the first time.
- 2001: Episode 8 of Digimon Tamers airs in Japan for the first time.
- 2014: Chapter 14 of Digimon World Re:Digitize: Encode is delayed to June 4 due to Kōhei Fujino being in bad health.
21st
- 2000: Episode 8 of Digimon Adventure 02 airs in Japan for the first time.
- 2006: Episode 8 of Digimon Savers airs in Japan for the first time.
22nd
- 2002: The single Innocent ~Mujaki na Mama de~ is released in Japan for the first time.
23rd
- 1999: Episode 12 of Digimon Adventure airs in Japan for the first time.
- 2000: Digimon World is released in North America for the PlayStation.
24th
Nothing is currently known to have happened on this day.
25th
Nothing is currently known to have happened on this day.
26th
- 2002: Episode 8 of Digimon Frontier airs in Japan for the first time.
27th
- 2001: Episode 9 of Digimon Tamers airs in Japan for the first time.
28th
- 2000: Episode 9 of Digimon Adventure 02 airs in Japan for the first time.
- 2006: Episode 9 of Digimon Savers airs in Japan for the first time.
29th
Nothing is currently known to have happened on this day.
30th
- 1999: Episode 13 of Digimon Adventure airs in Japan for the first time.
31st
Nothing is currently known to have happened on this day.