BUILT-IN MATHEMATICA SYMBOL

# DateDifference

DateDifference[date1, date2]
gives the number of days from to .

DateDifference[date1, date2, "unit"]
gives the difference between and in the specified unit.

DateDifference[date1, date2, {"unit1", "unit2", ...}]
gives the difference as a list with elements corresponding to the successive .

## Details and OptionsDetails and Options

• Dates can be specified in the following forms:
•  {y,m,d} year, month, day {y,m} the first day of the specified month {y} January 1 of the year y "string" date as a string () {y,m,d,h,m,s} precise time time absolute time specification
• Possible units are , , , , , , , .
• is taken to be equivalent to etc.
• DateDifference takes the following option:
•  DayCountConvention "ActualActual" counting convention by which the difference is computed
• DateDifference enumerated in days follows the day count convention, regardless of the magnitude of the difference.
• DateDifference[date2] gives the fractional number of days from the current time until .

## ExamplesExamplesopen allclose all

### Basic Examples (4)Basic Examples (4)

Give the number of days between January 1 and July 4:

 Out[1]=

Use dates specified in form:

 Out[1]=

Find a date difference in units of weeks:

 Out[1]=

If the second date is before the first, the date difference is negative:

 Out[1]=