For date calculations, the minimum possible date is 01/01/0001 and the maximum possible date is 12/31/9999. If adding or subtracting a value from a date causes it to pass the maximum or come before the minimum limit, the date reverts to the maximum value or minimum value.
When fractions are used, the decimal part of the value is discarded and only the whole number is used for the calculation. For example, addDays(date(2011,11,22), 3.74) adds 3 days to the given date.
Multiple date values can also be added together as a string using the ampersand (&) operator.