MATLAB Programming Fundamentals - MathWorks

JD = 1×3

2457629.92041667 2457660.92041667 2457690.92041667

Compare JDZ and JD. The differences are equal to the time zone offset between UTC and

the America/New_York time zone in fractional days.

JDZ - JD

ans = 1×3

0.166666666511446 0.166666666511446 0.166666666511446

Convert Zoned and Unzoned Datetime Values to POSIX Times

The POSIX time is the number of seconds (including fractional seconds) elapsed since

00:00:00 1-Jan-1970 UTC (Universal Coordinated Time), ignoring leap seconds. To

convert datetime arrays to POSIX times, use the posixtime function.

Create a datetime array and specify its time zone.

DZ = datetime('2016-07-29 10:05:24') + calmonths(1:3);

DZ.TimeZone = 'America/New_York'

DZ = 1x3 datetime array

29-Aug-2016 10:05:24 29-Sep-2016 10:05:24 29-Oct-2016 10:05:24

Convert D to the equivalent POSIX times.

PTZ = posixtime(DZ)

PTZ = 1×3

1472479524 1475157924 1477749924

Create an unzoned copy of DZ. Convert D to the equivalent POSIX times. As D has no time

zone, posixtime treats the times as UTC times.

D = DZ;

D.TimeZone = '';

PT = posixtime(D)

7 Dates and Time