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# DateDiff Function

Returns the number of date intervals between two given date values.

## Notkun:

    DateDiff (Add, Date1, Date2 [, Week_start [, Year_start]])

## Skilagildi:

A number.

## Viðföng:

Add - A string expression from the following table, specifying the date interval.

Add (string value) | Útskýring
yyyy | Ár
q | Ársfjórðungur
m | Mánuður
y | Dagur ársins
w | Vikudagur
ww | Vika í ári
d | Dagur
h | Klukkustund
n | Mínúta
s | Sekúnda

Date1, Date2 - The two date values to be compared.

Week_start - An optional parameter that specifies the starting day of a week.

Week_start value | Útskýring
0 | Use system default value
1 | Sunday (default)
2 | Mánudagur
3 | Þriðjudagur
4 | Miðvikudagur
5 | Fimmtudagur
6 | Föstudagur
7 | Laugardagur

Year_start - An optional parameter that specifies the starting week of a year.

Year_start value | Útskýring
0 | Use system default value
1 | Week 1 is the week with January, 1st (default)
2 | Week 1 is the first week containing four or more days of that year
3 | Week 1 is the first week containing only days of the new year

## Dæmi:

    Sub example_datediff
        MsgBox DateDiff("d", "1/1/2005", "12/31/2005")
    End Sub