How to find the absolution date?

2020 6 9
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更新时间：2020 6 9
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Dear All,
I think it is hard to find out the absolute date (current date). Because the computer date can be changed, for example, today is June 09, 2020, if I run datetime, it could find June 09, 2020. But if I change my computer date to 09 May 2020, datetime will give me 09 May 2020 which is Not the correct date of today. Is there a way to solve this problem?
Thanks a lot.
Benson

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David Hill
David Hill 2020-6-9

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A simple search showed several possible solutions.
s1 = webread('https://tycho.usno.navy.mil/cgi-bin/timer.pl');
s2 = regexp(s1, '<BR>(.*)\sUTC','tokens','once');
t = datetime(s2,'InputFormat','MMM. dd, HH:mm:ss');

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Benson Gou
Benson Gou 2020-6-9
Hi, David,
Thanks for your help. I run your code and got the followinf error message:
Error using webread (line 122)
The connection to URL 'https://tycho.usno.navy.mil/cgi-bin/timer.pl' timed out after 5.000 seconds. The reason is "Connection timed out after
5103 milliseconds". Perhaps the server is not responding or weboptions.Timeout needs to be set to a higher value.
Error in MainSEGNDSE01 (line 20)
s1 = webread('https://tycho.usno.navy.mil/cgi-bin/timer.pl');
Benson

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