Basic Arithmetic Dates Homepage
Collection of Date BABs (BADs)

This homepage of BADs (Basic Arithmetic Dates) is going to be re-designed during winter break 2009-2010 (didn't happen) summer break 2011 (didn't happen) summer break 2013? (didn't happen)... maybe someday.

The first BAD (Basic Arithmetic Date) was created on 25 February 2006 and it was for the date 03/01/06. BADs were done informally from time-to-time during lecture, but I decided to create a BAD collection with each BAD being its own BAB.

During the first couple weeks of April, a bunch of BADs were created and I realized that the BADs were going to bloat the BAB collection. Consequently, I decided to do one BAB a month that contained the BADs for that respective month.

Original BADs (One BAD Per BAB)

• 02/04/06 and 04/02/06
• 04/05/06
• 04/08/06
• 04/10/06
• 04/12/06

New BADs (One BAB Per Month Containing Multiple BADs)

• January 2006 Basic Arithmetic Dates [empty; extra credit]
• February 2006 Basic Arithmetic Dates [complete]
• March 2006 Basic Arithmetic Dates [complete]
• April 2006 Basic Arithmetic Dates [partial; extra credit]
• May 2006 Basic Arithmetic Dates [partial; extra credit]
• August 2006 Basic Arithmetic Dates [partial; extra credit]
• September 2006 Basic Arithmetic Dates [extra credit]
• BADs On BABs Birthdays [09 February 2007]
• 07/14/07
• August 2008 BADs
• Pi Approximation Day 2009 is Also a Pi BAD [22 July 2009]
• 25 July 2009 Was a Good BAD (and a Pi Approximation Day) [25 July 2009]
• 8 July 2009 Was an Average BAD [09 July 2009]
• 6 June 2009 is a BAD; and a D-Day and Tetris Anniversary [06 June 2009]
• 02/13/09 [Friday the 13th]
• 02/09/09 [BABs 4th anniversary]

GDT has minimized the creation of Basic Arithmetic Dates (BADs) primarily because they use 2-digit years. The Y2K problem taught us that 2-digit years should be avoided; therefore, BADs are bad. BADs are based upon 2-digit years at a time when we should be switching to using 5-digit years.

Post-BADs BADs

2021...

1. October 2021 BADs [created 30 September 2021; posted 01 October 2021]
2. September 2021 BADs [created 30 August 2021; posted 01 September 2021]
3. August 2021 BADs [created 30 July 2021; posted 01 August 2021]
4. July 2021 BADs [created 30 June 2021; posted 01 July 2021]
5. June 2021 BADs [created 30 May 2021; posted 01 June 2021]
6. May 2021 BADs [created 26 April 2021; posted 01 May 2021]
7. April 2021 BADs [created 26 March 2021; posted 01 April 2021]
8. March 2021 BADs [created 25 February 2021; posted 01 March 2021]
9. February 2021 BADs [created 25 January 2021; posted 01 February 2021]
10. January 2021 BADs [created 25 December 2020; posted 01 January 2021]

2020...

11. December 2020 BADs [created 30 November 2020; posted 01 December 2020]
12. November 2020 BADs [created 01 November 2020; posted 01 November 2020]
13. October 2020 BADs [created 28 September 2020; posted 01 October 2020]
14. September 2020 BADs [created 31 August 2020; posted 01 September 2020]
15. August 2020 BADs [created 31 July 2020; posted 01 August 2020]
16. July 2020 BADs [created 30 June 2020; posted 01 July 2020]
17. June 2020 BADs [created 31 May 2020; posted 01 June 2020]
18. May 2020 BADs [created 29 April 2020; posted 01 May 2020]
19. April 2020 BADs [created 30 March 2020; posted 01 April 2020]
20. March 2020 BADs [created 01 March 2020; posted 01 March 2020]
21. February 2020 BADs [created 02 February 2020; posted 02 February 2020]
22. January 2020 BADs [created 29 December 2019; posted 01 January 2020]

2019...

23. December 2019 BADs [created 29 November 2019; posted 01 December 2019]
24. November 2019 BADs [created 01 November 2019; posted 01 November 2019]
25. October 2019 BADs [created 28 September 2019; posted 01 October 2019]
26. September 2019 BADs [created 27 August 2019; posted 01 September 2019]
27. August 2019 BADs [created 29 July 2019; posted 01 August 2019]
28. July 2019 BADs [created 01 July 2019; posted 01 July 2019]
29. June 2019 BADs [created 30 May 2019; posted 01 June 2019]
30. May 2019 BADs [created 30 April 2019; posted 01 May 2019]
31. April 2019 BADs [created 01 April 2019; posted 01 April 2019]
32. March 2019 BADs [created 01 March 2019; posted 01 March 2019]
33. February 2019 BADs [created 31 January 2019; posted 01 February 2019]
34. January 2019 BADs [created 30 December 2018; posted 01 January 2019]

2018...

35. December 2018 BADs [created 30 November 2018; posted 01 December 2018]
36. November 2018 BADs [created 31 October 2018; posted 01 November 2018]
37. October 2018 BADs [created 30 September 2018; posted 01 October 2018]
38. September 2018 BADs [created 30 August 2018; posted 01 September 2018]
39. August 2018 BADs [created 30 July 2018; posted 30 July 2018]
40. July 2018 BADs [created 29 June 2018; posted 29 June 2018]
41. June 2018 BADs [created 29 May 2018; posted 29 May 2018]
42. May 2018 BADs [created 29 April 2018; posted 01 May 2018]
43. April 2018 BADs [created 30 March 2018; posted 01 April 2018]
44. March 2018 BADs [created 28 February 2018; posted 01 March 2018]
45. February 2018 BADs [created 30 January 2018; posted 01 February 2018]
46. January 2018 BADs [created 28 December 2018; posted 01 January 2018]

2017...

47. December 2017 BADs [created 12 December 2017; posted 12 December 2017]
48. November 2017 BADs [created 31 October 2017; posted 01 November 2017]
49. October 2017 BADs [created 30 September 2017; posted 01 October 2017]
50. September 2017 BADs [created 28 August 2017; posted 01 September 2017]
51. August 2017 BADs [created 25 July 2017; posted 01 August 2017]
52. July 2017 BADs [created 01 July 2017; posted 01 July 2017]
53. June 2017 BADs [created 05 June 2017; posted 05 June 2017]
54. May 2017 BADs [created 30 April 2017; posted 01 May 2017]
55. April 2017 BADs [created 30 March 2017; posted 01 April 2017]
56. March 2017 BADs [created 28 February 2017; posted 01 March 2017]
57. February 2017 BADs [created 31 January 2017; posted 01 February 2017]
58. January 2017 BADs [created 28 December 2016; posted 01 January 2017]

2016...

59. December 2016 BADs [created 30 November 2016; posted 01 December 2016]
60. November 2016 BADs [created 29 October 2016; posted 01 November 2016]
61. October 2016 BADs [created 27 September 2016; posted 01 October 2016]
62. 7 September 2016 is a Good BAD [created 07 September 2016; posted 07 September 2016]
63. September 2016 BADs [created 27 August 2016; posted 01 September 2016]
64. August 2016 BADs [created 01 August 2016; posted 01 August 2016]
65. July 2016 BADs [created 27 June 2016; posted 01 July 2016]
66. June 2016 BADs [created 29 May 2016; posted 01 June 2016]
67. May 2016 BADs [created 26 April 2016; posted 01 May 2016]
68. April 2016 BADs [created 25 March 2016; posted 01 April 2016]
69. March 2016 BADs [created 25 February 2016; posted 01 March 2016]
70. February 2016 BADs [created 25 January 2016; posted 01 February 2016]
71. January 2016 BADs [created 22 December 2015; posted 01 January 2016]

2015...

72. December 2015 BADs [created 28 November 2015; posted 01 December 2015]
73. November 2015 BADs [created 28 October 2015; posted 01 November 2015]
74. October 2015 BADs [created 23 September 2015; posted 01 October 2015]
75. September 2015 BADs [created 28 August 2015; posted 01 September 2015]
76. August 2015 BADs [created 30 July 2015; posted 01 August 2015]
77. July 2015 BADs [created 22 June 2015; posted 24 June 2015]
78. June 2015 BADs [created 27 May 2015; posted 31 May 2015]
79. May 2015 BADs [created 26 April 2015; posted 01 May 2015]
80. April 2015 BADs [created 29 March 2015; posted 01 April 2015]
81. March 2015 BADs [created 23 February 2015; posted 01 March 2015]
82. February 2015 BADs [created 25 January 2015; posted 01 February 2015]
83. January 2015 BADs [created 28 December 2014; posted 01 January 2015]

2014...

84. December 2014 BADs [created 30 November 2014; posted 01 December 2014]
85. November 2014 BADs [created 30 October 2014; posted 01 November 2014]
86. October 2014 BADs [created 28 September 2014; posted 01 October 2014]
87. September 2014 BADs [created 30 August 2014; posted 01 September 2014]
88. August 2014 BADs [created 30 July 2014; posted 01 August 2014]
89. July 2014 BADs [created 29 June 2014; posted 01 July 2014]
90. June 2014 BADs [created 31 May 2014; posted 01 June 2014]
91. May 2014 BADs [created 27 April 2014; posted 01 May 2014]
92. April 2014 BADs [created 29 March 2014; posted 01 April 2014]
93. March 2014 BADs [created 27 February 2014; posted 01 March 2014]
94. February 2014 BADs [created 29 January 2014; posted 01 February 2014]
95. January 2014 BADs [created 17 December 2013; posted 01 January 2014]

2013...

96. December 2013 BADs [created 30 November 2013; posted 01 December 2013]
97. November 2013 BADs [created 01 November 2013; posted 01 November 2013]
98. October 2013 BADs [created 29 September 2013; posted 01 October 2013]
99. September 2013 BADs [created 01 September 2013; posted 01 September 2013]
100. August 2013 BADs [created 01 August 2013; posted 01 August 2013]
101. July 2013 BADs [created 30 June 2013; posted 01 July 2013]
102. June 2013 BADs [created 22 May 2013; posted 22 May 2013]
103. May 2013 BADs [created 30 April 2013; posted 01 May 2013]
104. April 2013 BADs [created 30 April 2013; posted 30 April 2013]
105. March 2013 BADs [created 30 April 2013; posted 30 April 2013]
106. February 2013 BADs [created 29 April 2013; posted 30 April 2013]
107. January 2013 BADs [created 29 April 2013; posted 30 April 2013]

2012...

108. December 2012 BADs [created 01 December 2012; posted 30 April 2013]
109. November 2012 BADs [created 01 November 2012; posted 01 November 2012]
110. October 2012 BADs [created 30 September 2012; posted 01 October 2012]
111. September 2012 BADs [created 01 September 2012; posted 01 September 2012]
112. August 2012 BADs [created 01 August 2012; posted 01 August 2012]
113. July 2012 BADs [created 01 July 2012; posted 01 July 2012]
114. June 2012 BADs [created 31 May 2012; posted 01 June 2012]
115. May 2012 BADs [created 30 April 2012; posted 01 May 2012]
116. April 2012 BADs [created 29 March 2012; posted 01 April 2012]
117. March 2012 BADs [created 27 February 2012; posted 02 March 2012]
118. February 2012 BADs [created 27 February 2012]
119. January 2012 BADs [created 31 December 2011; posted 01 January 2012]

2011...

120. December 2011 BADs [created 01 December 2011]
121. November 2011 BADs [created 31 October 2011; posted 03 November 2011]
122. October 2011 BADs [created 29 September 2011; posted 02 October 2011]
123. September 2011 BADs [created 30 August 2011; posted 01 September 2011]
124. August 2011 BADs [created 30 July 2011; posted 02 August 2011]
125. July 2011 BADs [created 30 June 2011; posted 01 July 2011]
126. June 2011 BADs [created 31 May 2011; posted 01 June 2011]
127. May 2011 BADs [created 27 April 2011; posted 01 May 2011]
128. April 2011 BADs [created 29 March 2011; posted 01 April 2011]
129. March 2011 BADs [created 27 February 2011; posted 01 March 2011]
130. February 2011 BADs [created 31 January 2011; posted 01 February 2011]
131. January 2011 BADs [created 02 January 2011; posted 02 January 2011]

2010...

132. December 2010 BADs [created 29 November 2010; posted 01 December 2010]
133. November 2010 BADs [created 29 October 2010; posted 03 November 2010]
134. October 2010 BADs [created 30 September 2010; posted 01 October 2010]
135. September 2010 BADs [created 30 August 2010; posted 01 September 2010]
136. August 2010 BADs [created 26 July 2010; posted 01 August 2010]
137. July 2010 BADs [created 30 June 2010; posted 01 July 2010]
138. June 2010 BADs [created 23 May 2010; posted 09 June 2010]
139. May 2010 BADs [created 28 April 2010]
140. April 2010 BADs [created 28 March 2010]
141. March 2010 BADs [created 28 February 2010]
142. February 2010 BADs [created 29 January 2010]
143. January 2010 BADs [created 31 December 2009]

2009...

144. December 2009 BADs [created 27 November 2009]
145. November 2009 BADs [created 01 November 2009]
146. October 2009 BADs [created 29 September 2009]
147. September 2009 BADs [created 31 August 2009]
148. August 2009 BADs [created 28 July 2009; posted 03 August 2009]
149. July 2009 BADs [created 09 July 2009]
150. June 2009 BADs [created 07 June 2009]
151. May 2009 BADs [created on May Day 2009]
152. April 2009 BADs [created 06 April 2009]
153. March 2009 BADs [created on Square Root Day 2009]
154. February 2009 BADs [created on 27 November 2009]
155. January 2009 BADs [created on 27 November 2009]

2000...

156. January 2000 BADs [created 05 May 2015; posted 05 May 2015]

To Do: Create BADs for 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 05 April 2006