Conversion of Gregorian date to decimal years

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Ahmet Hakan UYANIK 2021-5-9

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评论： Walter Roberson 2021-5-10

采纳的回答： Walter Roberson

Hi,

I have time series given in gregorian time in seconds since 1992-01-01 00:00:00'. For example; 23853938,23853939...

How can i convert this gregorian time seconds to decimal years like 2010.544, 2010.545...

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Walter Roberson 2021-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/825540-conversion-of-gregorian-date-to-decimal-years#answer_695880

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basetime = datetime('1992-01-01 00:00');
gtime =  23853938
t1 = basetime + seconds(gtime)
t2 = dateshift(t1, 'start', 'year')
t3 = dateshift(t1, 'end', 'year')
fy = year(t1) + (t1-t2)./(t3-t2)

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Ahmet Hakan UYANIK 2021-5-10

编辑：Walter Roberson 2021-5-10

在 MATLAB Online 中打开

it is giving similar results as I did actually, what I do is;

T = datetime(1992,1,1) + seconds(gtime);
T.Format = 'yyyy-MM-dd HH:mm:ss'; 
dy = decyear(T)

both are correct, I guess :) Thank you in advance

Walter Roberson 2021-5-10

decyear() appears to require the Areospace Toolbox.

Also, setting the Format is not required for decyear()

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