September 21
| [[{{#ifeq:21|1|{{#switch:{{#ifeq:9|1|12|{{#expr:9-1}}}} | 1=January | 2=February | 3=March | 4=April | 5=May | 6=June | 7=July | 8=August | 9=September | 10=October | 11=November | 12=December | 1|12|{{#expr:9-1}}}}
}} {{#switch:{{#ifeq:9|1|12|{{#expr:9-1}}}} |
1=31 | 2=29 | 3=31 | 4=30 | 5=31 | 6=30 | 7=31 | 8=31 | 9=30 | 10=31 | 11=30 | 12=31 | 1|12|{{#expr:9-1}}}}
}} |
{{#switch:9 | 1=January | 2=February | 3=March | 4=April | 5=May | 6=June | 7=July | 8=August | 9=September | 10=October | 11=November | 12=December | 9
}} {{#expr:21-1}}}}|yesterday]] |
[[{{#ifeq:21|{{#switch:9 | 1=31 | 2=29 | 3=31 | 4=30 | 5=31 | 6=30 | 7=31 | 8=31 | 9=30 | 10=31 | 11=30 | 12=31 | 9
}} |
12|1|{{#expr:9+1}}}} | 1=January | 2=February | 3=March | 4=April | 5=May | 6=June | 7=July | 8=August | 9=September | 10=October | 11=November | 12=December | 12|1|{{#expr:9+1}}}}
}} 1|{{#switch:9 |
1=January | 2=February | 3=March | 4=April | 5=May | 6=June | 7=July | 8=August | 9=September | 10=October | 11=November | 12=December | 9
}} {{#expr:21+1}}}}|tomorrow]] | |||||
}
|- |[[{{#switch:{{#if:9| {{#switch:{{#expr: 9 + -1}} |0=12 |13=1 |{{#expr: 9 + -1}} }} |}}{{#if:| {{#switch:{{{daysinmonth}}} |1=31 |2=29 |3=31 |4=30 |5=31 |6=30 |7=31 |8=31 |9=30 |10=31 |11=30 |12=31 | }}|}}{{#if:|{{#ifeq:{{#expr: ({{{isnextmonth}}} + -1) > Template:Cal-date/offset2 }}|1|1|}}|}}{{#if:|{{#ifeq:{{#expr: ({{{isprevmonth}}} + -1) < 1}}|1|1|}}|}}{{#if:|{{#if:Template:Cal-date/offset2Template:Cal-date/offset2|Template:Cal-date/offset2|{{{getoffsetmonth}}}}}|}}{{#if:|{{#if:Template:Cal-date/offset2Template:Cal-date/offset2|{{#if:Template:Cal-date/offset2|Template:Cal-date/offset2|1}}|pew{{#expr: {{{getoffsetday}}} + -1}}}}|}} |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |{{#if:9| {{#switch:{{#expr: 9 + -1}} |0=12 |13=1 |{{#expr: 9 + -1}} }} |}}{{#if:| {{#switch:{{{daysinmonth}}} |1=31 |2=29 |3=31 |4=30 |5=31 |6=30 |7=31 |8=31 |9=30 |10=31 |11=30 |12=31 | }}|}}{{#if:|{{#ifeq:{{#expr: ({{{isnextmonth}}} + -1) > Template:Cal-date/offset2 }}|1|1|}}|}}{{#if:|{{#ifeq:{{#expr: ({{{isprevmonth}}} + -1) < 1}}|1|1|}}|}}{{#if:|{{#if:Template:Cal-date/offset2Template:Cal-date/offset2|Template:Cal-date/offset2|{{{getoffsetmonth}}}}}|}}{{#if:|{{#if:Template:Cal-date/offset2Template:Cal-date/offset2|{{#if:Template:Cal-date/offset2|Template:Cal-date/offset2|1}}|pew{{#expr: {{{getoffsetday}}} + -1}}}}|}} }}|«]] | colspan="5" align="center"| [[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }}]] |[[{{#switch:{{#if:9| {{#switch:{{#expr: 9 + 1}} |0=12 |13=1 |{{#expr: 9 + 1}} }} |}}{{#if:| {{#switch:{{{daysinmonth}}} |1=31 |2=29 |3=31 |4=30 |5=31 |6=30 |7=31 |8=31 |9=30 |10=31 |11=30 |12=31 | }}|}}{{#if:|{{#ifeq:{{#expr: ({{{isnextmonth}}} + 1) > Template:Cal-date/offset2 }}|1|1|}}|}}{{#if:|{{#ifeq:{{#expr: ({{{isprevmonth}}} + 1) < 1}}|1|1|}}|}}{{#if:|{{#if:Template:Cal-date/offset2Template:Cal-date/offset2|Template:Cal-date/offset2|{{{getoffsetmonth}}}}}|}}{{#if:|{{#if:Template:Cal-date/offset2Template:Cal-date/offset2|{{#if:Template:Cal-date/offset2|Template:Cal-date/offset2|1}}|pew{{#expr: {{{getoffsetday}}} + 1}}}}|}} |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |{{#if:9| {{#switch:{{#expr: 9 + 1}} |0=12 |13=1 |{{#expr: 9 + 1}} }} |}}{{#if:| {{#switch:{{{daysinmonth}}} |1=31 |2=29 |3=31 |4=30 |5=31 |6=30 |7=31 |8=31 |9=30 |10=31 |11=30 |12=31 | }}|}}{{#if:|{{#ifeq:{{#expr: ({{{isnextmonth}}} + 1) > Template:Cal-date/offset2 }}|1|1|}}|}}{{#if:|{{#ifeq:{{#expr: ({{{isprevmonth}}} + 1) < 1}}|1|1|}}|}}{{#if:|{{#if:Template:Cal-date/offset2Template:Cal-date/offset2|Template:Cal-date/offset2|{{{getoffsetmonth}}}}}|}}{{#if:|{{#if:Template:Cal-date/offset2Template:Cal-date/offset2|{{#if:Template:Cal-date/offset2|Template:Cal-date/offset2|1}}|pew{{#expr: {{{getoffsetday}}} + 1}}}}|}} }}|»]] |- |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 1|1]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 2|2]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 3|3]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 4|4]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 5|5]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 6|6]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 7|7]] |- |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 8|8]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 9|9]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 10|10]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 11|11]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 12|12]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 13|13]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 14|14]] |- |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 15|15]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 16|16]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 17|17]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 18|18]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 19|19]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 20|20]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 21|21]] |- |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 22|22]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 23|23]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 24|24]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 25|25]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 26|26]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 27|27]] |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 28|28]] |- |[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 29|29]] |{{#ifeq:9|2||[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 30|30]]}} |{{#ifeq:{{#if:| {{#switch:{{#expr: {{{monthoffset}}} + 0}} |0=12 |13=1 |{{#expr: {{{monthoffset}}} + 0}} }} |}}{{#if:9| {{#switch:9 |1=31 |2=29 |3=31 |4=30 |5=31 |6=30 |7=31 |8=31 |9=30 |10=31 |11=30 |12=31 | }}|}}{{#if:|{{#ifeq:{{#expr: ({{{isnextmonth}}} + 0) > Template:Cal-date/offset2 }}|1|1|}}|}}{{#if:|{{#ifeq:{{#expr: ({{{isprevmonth}}} + 0) < 1}}|1|1|}}|}}{{#if:|{{#if:Template:Cal-date/offset2Template:Cal-date/offset2|Template:Cal-date/offset2|{{{getoffsetmonth}}}}}|}}{{#if:|{{#if:Template:Cal-date/offset2Template:Cal-date/offset2|{{#if:Template:Cal-date/offset2|Template:Cal-date/offset2|1}}|pew{{#expr: {{{getoffsetday}}} + 0}}}}|}}|31|[[{{#switch:9 |1=January |2=February |3=March |4=April |5=May |6=June |7=July |8=August |9=September |10=October |11=November |12=December |9 }} 31|31]]|}} | colspan="4"| |}
{{#if:||}}
- ???? — Mayumi Kurokawa (Japanese voice of Bud Hansen) is born.
- ???? — Japanese voice actor Joichiro Yoshida is born.
- 1955 — Pietro Ubaldi (Italian voice of Lugnut, Omega Supreme, Bulkhead, Boulder, Scowl, Maccadam and more) is born.
- 1960 — Musician Asakawa Tomoyuki ("Moero! Transformer") is born.
- 1963 — Oliver Mink (German voice of Cade Yeager) is born.
- 1966 — Jean-Pierre Michaël (French voice of Agent Schloder in Transformers: EarthSpark) is born.
- 1980 — Karine Foviau (French voice of Twitch in Transformers: EarthSpark) is born.
- 1985 — The Japanese Generation 1 OP/ED single "TRANSFORMER"/"Peace Again" is released by Victor Entertainment.
- 1985 — Lyrian (voice actress for Marissa Faireborn and others in the Kiss Players radio series) is born.
- 1987 — Andrea Oldani (Italian voice of Russell Clay) is born.
- 1993 — Andrea Rotolo (Italian voice of Blurr in the Season 3 redub) is born.
- 1999 — The Kid Rhino VHS tapes of The Original Transformers Volumes 1-3 are released in the US both individually and in a three-pack.
- 2001 — The Robots in Disguise episode "The Ultimate Robot Warrior" premieres in the US.
- 2005 — The first day of BotCon 2005 in Frisco, Texas.
- 2006 — The Cybertron episode "Optimus" premieres in the US.
- 2006 — The second issue of the Kiss Players manga is published.
- 2007 — The Transformers live-action movie begins its IMAX run with extra scenes not in the normal theatrical release.
- 2008 — The Animated episode "Sound and Fury" premieres in France.
- 2011 — The Transformers #26 is released by IDW Publishing.
- 2012 — The Transformers: Prime episode "Legacy" premieres on The Hub.
- 2012 — The Transformers: Prime episode "Operation: Breakdown" premieres in Indonesia
- 2012 — "Sand Trap" is first published by Eaglemoss/GE Fabbri in Russia.
- 2015 — The Robots in Disguise episode "Out of Focus" premieres in Hungary.
- 2015 — The Robots in Disguise episode "Similarly Different" premieres in Italy.
- 2015 — The Robots in Disguise episode "Ghosts and Impostors" premieres in Poland.
- 2015 — The Q-Transformers" episode "The Road to Q-Transformers Land Which Won't Lose to Puroland" first premieres.
- 2016 — Revolution #1 and Till All Are One #4 are released by IDW Publishing.
- 2016 — Final day of the Angry Birds Transformers mobile game's "Lock & Load" Challenge Event.
- 2017 — The Robots in Disguise episode "Prepare for Departure" premieres in France.
- 2018 — The Cyberverse episode "The Journey" airs on the Cartoon Network app and website.
- 2019 — The Rescue Bots Academy episodes "Hack Attack" and "Life of the Party" premiere on Discovery Family.
- 2019 — The Cyberverse episode "The Visitor" premieres on Cartoon Network.
- 2022 — Transformers: Best of Starscream is released by IDW Publishing.
- 2022 — Hasbro Pulse announces its expansion further in the EU being now available in France, Spain, Italy, and Austria.