IRIS Toolbox Reference Manual

## datdiff

Number of periods between two dates with check for date frequency

#### Syntax

    D = datdiff(D1,D2)

#### Input arguments

- `D1`, `D2` [ numeric ] - IRIS dates of vectors of IRIS dates.

#### Output arguments

- `D` [ numeric ] - Number of periods between `D1` and `D2`, positive for `D1` greater than `D2`, negative for `D1` smaller than `D2`, or NaN for dates of different frequencies.

#### Description

#### Example

    d1 = mm(2010,12);
    d2 = mm(2011,12);

    datdiff(d1,d2)
    ans =
       -12

    datdiff(d2,d1)
    ans =
        12

    d3 = yy(2011);
    datdiff(d1,d3)
    ans =
       NaN

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