### Description#

You can store an entire date in a single integer using a shift hack:

Example in C:

```
unsigned int d = 12; /* 12 in binary is 0b1100. */
unsigned int m = 6; /* 6 in binary is 0b110. */
unsigned int y = 1983; /* 1983 in binary is 0b11110111111. */
unsigned int date = (((y << 4) + m) << 5) + d;
/* Add 0b11110111111000000000
and 0b11000000 and 0b1100.
Sum is 0b11110111111011001100. */
/* 32 in binary is 0b100000. */
/* Remainder dividing by 32 gives lowest 5 bits, 0b1100. */
d = date % 32;
/* Shifting 5 bits right discards the day, leaving 0b111101111110110.
Remainder dividing by 16 gives lowest remaining 4 bits, 0b110. */
m = (date >> 5) % 16;
/* Shifting 9 bits right discards day and month,
leaving 0b111101111110. */
y = date >> 9;
```