convert current date and time to char

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Hi,
I need 2 parameters. The first is the current date and time in the format: '2022-05-02T08:00:00Z'
The second is that datetime minus 6 hours as a char.
Anyone who can help me?
endtime = '2022-05-02T13:59:00Z'; %this needs to be the current datetime - 6 hours
starttime = '2022-05-02T08:00:00Z'; %This needs to be the current datetime

Accepted Answer

Rik
Rik on 4 May 2022
Edited: Rik on 4 May 2022
datestr(now-6/24,31)
ans = '2022-05-04 07:01:11'
datestr(now_UTC-6/24,31)
ans = '2022-05-04 07:01:11'
If you want to force the use of UTC+0 as the timezone (as your Z seems to suggest), you might be interested in getUTC.
In the case of the online run tool there is no difference, as most servers (in my experience) already use UTC+0 as their time zone.
function t=now_UTC
persistent timezone_delta
if isempty(timezone_delta),timezone_delta=getUTC-now;end
t=now+timezone_delta;
end

More Answers (2)

Stephen23
Stephen23 on 4 May 2022
Avoid deprecated DATESTR and DATENUM.
one = datetime('now','Format','yyyy-MM-dd''T''HH:mm:ss''Z''')
one = datetime
2022-05-04T12:11:00Z
two = one - hours(6)
two = datetime
2022-05-04T06:11:00Z

John D'Errico
John D'Errico on 4 May 2022
Edited: John D'Errico on 4 May 2022
Easier than you think.
First, what is the current time?
format long g
CurrentTime = now
CurrentTime =
738645.50979622
That might not seem terribly helpful. However, datestr will help a lot.
datestr(CurrentTime)
ans = '04-May-2022 12:14:06'
You want to see an offset of 6 hours before that time. That is 1/4 of a day.
datestr(CurrentTime - 1/4)
ans = '04-May-2022 06:14:06'
So we are getting there. But of course, it is not exactly in the format you wish to see. First we will fix the date part, and you want that in the form of Year, Month, Day. The integer part of the time reported by now is the date. For example, we can do this:
datestr(fix(CurrentTime),'yyyy-mm-dd')
ans = '2022-05-04'
And that gives you the date in a format as you desire. You can format the time part similarly.
datestr(CurrentTime - fix(CurrentTime),'HH:MM:SS')
ans = '12:14:06'
And then you wanted a spare T and Z in there for some reason. So we might write a little helper function like this:
mytimeformat = @(CT) [datestr(CT,'yyyy-mm-dd'),'T',datestr(CT - fix(CT),'HH:MM:SS'),'Z'];
mytimeformat(CurrentTime)
ans = '2022-05-04T12:14:06Z'
As you can see, that formats a time and date in the way you want it, specifically with the extra characters in there. The second time you wanted to see was 6 hours before that.
mytimeformat(CurrentTime - 1/4)
ans = '2022-05-04T06:14:06Z'
I'm sure there re other ways to do this, but the point is, when you have a difficult problem to solve in MATLAB, start from something you can find. Then work with it. Perhaps you can massage that result into something close to what you need. Then keep on working at it. In the end, you will see it was easier than you thought all along.

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