Convert epoch to human readable data and time

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Giorgia Fusaroli 2021-12-1

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回答： Giorgia Fusaroli 2021-12-1

Hi,

i have a vector of time in epoch format (read as double in Matlab). I have to convert all the elements in a format HH:MM:SS till milli or even nano seconds if it is possible.

The vector time is related to data acquired on 20th October 2021.

Can someone help me please ?

Thank you in advance

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Star Strider 2021-12-1

What is the epoch time for midnight on 20th October 2021, and 1 and 60 seconds later?

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Answer 1

Spectro 2021-12-1

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编辑：Spectro 2021-12-1

Have a look at datetime() using parameter "ConvertFrom":

epochs = [1638351674 1638351674];

datetime(epochs, 'ConvertFrom', 'epochtime')

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Giorgia Fusaroli 2021-12-1

no, but then the output is in the follow format:

5.1802e+10 CE

And i don't even know what it means :(

Spectro 2021-12-1

Attach the data please.

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Answer 2

Giorgia Fusaroli 2021-12-1

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FYI

I solve the problem in this way:

epochs = uint64(vector-of-epoch-data)
datetime(epochs,'ConvertFrom','epochtime','TicksPerSecond',1e9,'Format','dd-MMM-yyyy HH:mm:ss.SSSSSSSSS');

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Answer 3

Steven Lord 2021-12-1

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What's the unit of time a value of 1 in your epochtime represents? Seconds, microseconds, nanoseconds, etc.?

t = 6000;
start = datetime('today') % Use midnight today as the start of the epoch
start = datetime
   01-Dec-2021
dt1 = datetime(t, 'ConvertFrom', 'epochtime', 'Epoch', start) % 6000 seconds after the epoch
dt1 = datetime
   01-Dec-2021 01:40:00
dt2 = datetime(t, 'ConvertFrom', 'epochtime', 'Epoch', start, ...
    'TicksPerSecond', 1000) % 6000/1000 seconds after the epoch
dt2 = datetime
   01-Dec-2021 00:00:06

You may also want to look at the table in the entry for the dateType input argument to datetime to see if one of the provided options matches what your time data represents: 'ntp', '.net', or 'ntfs' perhaps, since they each represent a number of "clock ticks" that are a small fraction of a second?