importdata not reading time stamp from excel sheet accurately

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I have been using importdata to read an excel sheet with time stamps. The time stamp on excel sheet is 1/1/2015 12:20:18 AM. When importdata is used, this time stamp gets converted to [42005.014097222]. I tried using datestr([42005.014097222],31) command and this is being converted to '0115-01-02 00:20:18'; but it has to be 2015-01-01 00:20:18'. How can this be fixed? Thank you!
Here is the program:
[filename, pathname] = uigetfile({'*.*'},'Choose the input file');
delimiterIn = ',';
headerlinesIn = 0;
A = importdata([pathname filename],delimiterIn,headerlinesIn); %this is a long array of time stamps, just citing one in the example above.
start_time=A(:,1); %start_time(1)=[42005.014097222]; but the 1st element in the excel sheet is 1/1/2015 12:20:18 AM
stop_time=A(:,2);
[y1,m1,d1,h1,m1,s1]=datevec(datestr(start_time,31)); %the result here gives me y1=115 and d1=2; but the right result should be y1=2015 and d1=1.
[y2,m2,d2,h2,m2,s2]=datevec(datestr(stop_time,31));

采纳的回答

Ajay Kumar
Ajay Kumar 2019-9-28
编辑:Ajay Kumar 2019-9-29
The default date for excel is 1899/12/30_00:00:00. So you have to add this to the date number to get the correct date.
Try this
t1 = datenum('1899/12/30_00:00:00','yyyy/mm/dd_HH:MM:SS');
datestr(t1+42005.014097222)
Please accept the answer if you got what you need. Thanks :)
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