function day is not working in matlab 2020a

I got the following error while using the function 'day' in matlab 2020a. But its worked in 2016a

>>t =

7.3652e+05

>> day(t)

Check for missing argument or incorrect argument data type in call to function 'day'.

Answer 1

[Ameer Hamza]

Function day() is defined for datetime input arguments. For example

>> t = datetime('now');
>> day(t)
ans =
    21

[Prasanth R]

Thanks for your time. I have time values as double (100x1 double matrix). How can I extract day number from each value? I tried this way but the day numbers are totally changed.

(here tt is my matrix)

tint = int64(tt);

tdate = datetime(tint,'ConvertFrom','yyyymmdd') ;

day_count = day(tdate,'dayofmonth') ;

[Ameer Hamza]

What is the format of date stored in 'tt'? What does the number represent?

[Prasanth R]

Issue solved. I removed the line

tint = int64(tt);

and used 'datenum' in datetime function

(tt= my matrix)

tdate = datetime(tt,'ConvertFrom','datenum') ;

day_count = day(tdate,'dayofmonth') ;

Thanks for your valuable time and consideration...

[Ameer Hamza]

I am glad to be of help!!!