Convert epoch to human readable data and time

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Giorgia Fusaroli on 1 Dec 2021
Answered: Giorgia Fusaroli on 1 Dec 2021
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 ?
Star Strider on 1 Dec 2021
What is the epoch time for midnight on 20th October 2021, and 1 and 60 seconds later?
.

Spectro on 1 Dec 2021
Edited: Spectro on 1 Dec 2021
Have a look at datetime() using parameter "ConvertFrom":
epochs = [1638351674 1638351674];
datetime(epochs, 'ConvertFrom', 'epochtime')
Spectro on 1 Dec 2021

Giorgia Fusaroli on 1 Dec 2021
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');

Steven Lord on 1 Dec 2021
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?

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