MATLAB: Datenum with a.m. and p.m.

datenum timestamp a.m. p.m.

I have a data set with timestamps:

'11/5/2019 12 a.m. EST'

…

'11/10/2019 1 p.m. EST'

How can I convert these timestamps into a vector of date numbers?

thanks for the help.

Best Answer

Assuming there is ".m. EST" attached to each "timestamp" at the end. You can follow the steps:

Step-1 Replace ".m. EST" to just "m" (Hint : regexprep)

Step-2 Convert the output into the date numbers (Hint: datenum)

You should get the output with date numbers in a array. (Not sure what do mean by "continuous"?)

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MATLAB: Converting datenum to days

The output of datenum are whole days to the left of the decimal separator (as the number of days from January 0, 0000), and fractions of a day to the right. You can get other details about the days using the appropriate datetime (link) functions.

Example —

dn = now                                                    % Date Number
dt = datetime(dn, 'ConvertFrom','datenum')                  % Corresponding ‘datetime’ Object
daynr = day(dt)                                             % Day Of The Month
dayyr = day(dt, 'dayofyear')                                % Day Of The Year    
dn =
          737187.560337454
dt = 
   07-May-2018 13:26:53
daynr =
     7
dayyr =
   127

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Posix Time is defined relative to a particular timezone (in the POSIX standard), whereas datenum is not defined relative to any particular timezone.

That said... since POSIX Time is defined relative to UTC, one would expect that datetime would automatically tag on a timezone identifier when you converted from posixtime, but it does not do so in the datetime object.

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