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. Despite BADs being bad, today's date (14 July 2007), when written in MM/DD/YY format (7/14/07), is a BAD.

```   07/14/07:  7 + 7 = 14
```

Seven days ago the date was `07/07/07` and it was a date that made lots of news. Today's date could be written as `7/7+7/07`. Seven days from today will be the date `7/7+7+7/07` and two weeks from today will be the date `7/7+7+7+7/07`.

Tomorrow and the day after that are both BADs. And although we skipped it, 7/7/07 was also a BAD.

```   07/15/07:  (7 + 15) / 7 approximates Pi (3.14)
07/16/07:  7 + 7 = 16base-8  ...or...
7^(sqrt(sqrt(16))) = 7
07/07/07:  sqrt(7 * 7) = 7
```
##### Exercises
1. No or Yes: `7` is a multiple of `14`.

2. No or Yes: `7` is a factor of `14`.

3. No or Yes: `7 squared` is `14`.

Creator: Gerald D. Thurman [gthurman@gmail.com]
Created: 14 July 2007