Day Function not Working

2013 8 30
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Hello!
I have a cell array (question_display_time) filled with dates in the following format string = 'yyyy-mm-dd HH:MM:SS.FFF'.
When I try to run the day function Matlab returns the following: Undefined function 'day' for input arguments of type 'cell'.
When I try to run it on a sample string I get the following Undefined function 'day' for input arguments of type 'char'.
Am I doing something wrong? I thought this would be a simple function to grab the date with!
What I have tried: dayDate = cellfun(@day, question_display_time) day(string,'yyyy-mm-dd HH:MM:SS.FFF') day('2013-05-05 12:33:33.1234')
Any ideas? :)

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Azzi Abdelmalek
Azzi Abdelmalek 2013-8-30

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day('2013-05-05 12:33:33','yyyy-mm-dd HH:MM:SS')

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Mary
Mary 2013-8-30
编辑：Mary 2013-8-30
I still get the undefined function 'day' for input arguments of type char with this answer...
>> day('2013-05-05 12:33:33','yyyy-mm-dd HH:MM:SS') Undefined function 'day' for input arguments of type 'char'.
Mary
Mary 2013-8-30
C:\Program Files\MATLAB\R2013a\toolbox\finance\calendar\day.m
it exists - I found an easier method to do this without using the day function
days = datestr(question_display_time,'dd')
Thank you for your help and quick responses

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