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# datenum

Convert to serial date number

### Syntax

```N = datenum()
N = datenum(DT)
N = datenum(Y, M, D)
N = datenum(Y, M, D, H, MI, S)```

### Description

The datenum function converts date vectors (defined by datevec) into serial date numbers. Date numbers are serial days elapsed from some reference date. By default, the serial day 1 corresponds to 1-Jan-0000.

N = datenum() returns the serial date numbers corresponding to current date.

N = datenum(DT) converts one or more date vectors to serial date number N. DT can be an m-by-6 or m-by-3 matrix containing m full or partial date vector respectively.

N = datenum(Y, M, D) returns the serial date numbers for corresponding elements of the Y, M, and D (year, month, day) arrays. Y, M and D must be arrays of the same size (or any can be a scalar).

N = datenum(Y, M, D, H, MI, S) returns the serial date numbers for corresponding elements of the Y, M, D, H, MI, and S (year, month, day, hour, minute, and second) array values.Y, M, D, H, MI, and S must be arrays of the same size (or any can be a scalar).

### Examples

```// N = datenum()
datenum()

// N = datenum(DT)
A = [ 0 1 1 0 0 0 ; 2005 2 8 21 37 30 ]
datenum(A)

// N = datenum(Y, M, D)

Years = [0; 1973; 2006]
Months = [1; 8; 2]
Days = [1; 4; 8]
datenum(Years,Months,Days)

Years = [0 0 0 ; 0 0 0]
Months = [1 1 1 ; 1 1 1]
Days = [1 2 3 ; 4 5 6]
datenum(Years,Months,Days)

// N = datenum(Y, M, D, H, MI, S)

Years = grand(5,10,'uin',0,2006)
Months = grand(5,10,'uin',1,12)
Days = grand(5,10,'uin',1,28)
Hours = grand(5,10,'uin',0,23)
Minutes = grand(5,10,'uin',0,59)
Seconds = grand(5,10,'uin',0,59)
datenum(Years,Months,Days,Hours,Minutes,Seconds)```

### See also

• datevec — Date components
• calendar — Calendar of a given month and year (Gregorian dates)
 Report an issue << date Data e Hora datevec >>

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