MATLAB: Datetime: Undefined function ‘datetime’ for input arguments of type ‘double’

datetimeMATLAB

I am using following code to convert datenum to datetime

x=723707;
y=datetime(x,'ConvertFrom','datenum');

I get the error message:

 Undefined function 'datetime' for input arguments of type 'double'.

When I try

 open datetime

I get the error message that

 file 'datetime' does not exist.

I don't understand what's wrong. Please help. I am using MATLAB 2014a.

Best Answer

datetime() was introduced in R2014b.

Related Solutions

MATLAB: How to subtract ‘datetime’ from ‘datetime’ in MATLAB GUI

The problem is converting to strings instead of just comparing...

What will work to compute the offset including DST if in effect is--

v=now;                  % return the local current time as datenum(*)
t1=datetime(v,'ConvertFrom','datenum','TimeZone','America/New_York','Format','d-MMM-y HH:mm:ss Z');
t2=datetime(v,'ConvertFrom','datenum','TimeZone','Africa/Khartoum','Format','d-MMM-y HH:mm:ss Z');
u=t2-t1
u = 
duration
 -7:00:00

The above sets the local time a variable before calling the conversion factors to ensure there isn't a rollover between the two calls to datetime that would introduce a small error in the result if were to occur.

(*) Interesting shortcoming that TMW hasn't introduced a datetime-aware routine to parallel the old standby that returns a datenum.

ADDENDUM

An alternative would be to use the timezones table data--

A=timezones('Africa');            % get the Africa table
N=timezones('America');           % and Americas, too
Z1=N(contains(N.Name,'New_York'); % retrieve TZ of specific interest
Z2=A(contains(A.Name,'Khartoum');
u=Z2.UTCOffset+Z2.DSTOffset-(Z1.UTCOffset+Z1.DSTOffset) % offset including DTS
u =
   7

The problem with this is that I don't believe the table will update the DTS offset with time of year; it's just the value used in the location. So, this is probably not viable actual solution lacking a test for whether DST is in effect in both locations at the time of interest.

MATLAB: Set union of different ‘datetime’ columns

If understood correctly, you have several columns which are datetime and you want to regroup them in just one column.

In that case, use stack.

Best Answer

Related Solutions

MATLAB: How to subtract ‘datetime’ from ‘datetime’ in MATLAB GUI

MATLAB: Set union of different ‘datetime’ columns

Related Question