MATLAB: Can I get a datetime output in a different Time Zone from the input Time Zone in one function call

datetimeMATLAB

d = datetime('2016-Jan-20 12:00:00','TimeZone','UTC')

and then

d.TimeZone = 'America/New_York'

gets me the transformed time from the input… is there any way to get this answer in the original function call, without haveing the 2nd command? I know there is a Format option, but I cannot see how one can add a TimeZone in that. transform the input TimeZone.

Best Answer

d = subsasgn(datetime('2016-Jan-20 12:00:00','TimeZone','UTC'), struct('type', '.', 'subs', {'TimeZone'}), 'America/New_York');

You might want to create a help function for that, like

sset = @(var, sub, val) subsassgn(var, struct('type', '.', 'subs', {sub}), val);

and then

sset(datetime('2016-Jan-20 12:00:00','TimeZone','UTC'), 'TimeZone', 'America/New_York')

datetimeNY = @(date) subsasgn( datetime(date, 'TimeZone', 'UTC'), struct('type', '.', 'subs', {'TimeZone'}), 'America/New_York');

which you could then use as

d = datetimeNY('2016-Jan-20 12:00:00');

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MATLAB: Function for day of the year

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>> day( datetime('07-Jan-2017', 'InputFormat', 'dd-MMM-yyyy' ), 'dayofyear' )
ans =
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>> day( datetime('01-Mar-2017', 'InputFormat', 'dd-MMM-yyyy' ), 'dayofyear' )
ans =
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>> day( datetime('01-Mar-2016', 'InputFormat', 'dd-MMM-yyyy' ), 'dayofyear' )
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MATLAB: How to compare datetime hours across time zones

If you want to compare Exact datetime values (With Date)

This work is already done for you in the "==" operator.

nyTime = datetime(2017,1,1,0,0,0,'TimeZone','America/New_York')
% 01-Jan-2017 00:00:00 - America/New_York
tokyoTime = datetime(2017,1,1,14,0,0,'TimeZone','Asia/Tokyo')
% 01-Jan-2017 14:00:00
isSame = nyTime == tokyoTime
% isSame = 1

Compare datetimes by Hour:Minute:Second across time zones (No Date)

If the datetime has defined the "TimeZone" property, the hours will change when you update the TimeZone. Using this, we can create a function that updates the TimeZone to 'UTC' and compares the "timeofday" value.

For example, to find the dates in

             % dtimes = [T×1 datetime array in TimeZone 'America/New_York']
             query = datetime('14:29:00', 'TimeZone', 'Asia/Tokyo');

You could create a function as follows to compare the values in a common timezone, here we use UTC:

function isSameHrMin = SameHourMinute(dtimes, query)
    dtimes.TimeZone = 'UTC';
    query.TimeZone = 'UTC';
    isSameHrMin = timeofday(dtimes) == timeofday(query);
end

This function will return the indices of datetime values with the same timezone dependent hour, minute and second values.

Best Answer

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MATLAB: Function for day of the year

MATLAB: How to compare datetime hours across time zones

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