Convert MATLAB formatted dates to CDF formatted dates
E = cdfepoch(date)
E = cdfepoch(date) converts the date, specified by date, into a cdfepoch object. date must be a valid date string, returned by datestr, or a serial date number, returned by datenum. date can also be a cdfepoch object.
When writing data to a CDF file using cdfwrite, use cdfepoch to convert MATLAB® formatted dates to CDF formatted dates. The MATLAB cdfepoch object simulates the CDFEPOCH data type in CDF files.
To convert a cdfepoch object into a MATLAB serial date number, use the todatenum function.
The MATLAB serial date number calculates dates differently than CDF epochs.
A MATLAB serial date number represents the whole and fractional number of days from 1-Jan-0000 to a specific date. The year 0000 is merely a reference point and is not intended to be interpreted as a real year in time.
A CDF epoch is the number of milliseconds since 1-Jan-0000.
Convert the current time in serial date number format into a CDF epoch object.
% NOW function returns current time as serial date number dateobj = cdfepoch(now) dateobj = cdfepoch object: 11-Mar-2009 15:09:25
Convert the current time in date string format into a CDF epoch object.
% DATESTR function returns date as string dateobj2 = cdfepoch(datestr(now)) dateobj2 = cdfepoch object: 11-Mar-2009 15:09:25
Convert the CDF epoch object into a serial date number.
dateobj = cdfepoch(now); mydatenum = todatenum(dateobj) mydatenum = 7.3384e+005