Convert date string or serial date number 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® date strings
or serial date numbers 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 0-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 15:09:25Convert 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 15:09:25Convert the CDF epoch object into a serial date number.
dateobj = cdfepoch(now);
mydatenum = todatenum(dateobj)
mydatenum =
7.3384e+005