February 29 is a date that usually occurs every four years, and is called leap day. This day is added to the calendar in leap years as a corrective measure, because the Earth does not orbit the sun in precisely 365 days. The Gregorian calendar is a modification of the Julian calendar first used by the Romans.
For example, in the formula DATE( 2008, 5, -15), the DATE function returns a datetime value equivalent to April 15th of 2008, because 15 days are subtracted from the beginning of May 2008 yielding a value of April 2008.
âºâº Enter the number of days to count. Type in the number of days you want to calculate from today. If you want to find a previous date, you can enter a negative number to figure out the number of days before today. Due to date calculation restrictions, the allowable range is from -41578 to 8131.tart your calculation with today, which falls on a Thursday. Counting forward, the next day would be a Friday. To get exactly two hundred and fifty-six weekdays from now, you actually need to count 358 total days (including weekend days). That means that 256 weekdays from today would be October 7, 2016.