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Time difference in year between table datetime values and now

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KAE
KAE 2024년 5월 22일
답변: Steven Lord 2024년 5월 22일
I have a vector of datetime values. I would like to get a vector of years elapsed between the datetime values and the present. How do I do this?
I tried
years(MyTable.BirthDate- now)
and got
Error using years
Input data must be a real, numeric array, or a duration array. Use YEAR to extract year numbers from a
datetime array.
I tried
year(MyTable.BirthDate- now)
but it rounded the values, and I would like the decimal difference. How can I get, for example, that one of the entries is 6.8 years old today?

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Steven Lord
Steven Lord 2024년 5월 22일
Don't use the now function. It returns a serial date number. Use datetime('now') (which returns a datetime) instead.
fiveYearsFromNow = datetime(2029, 5, 22)
fiveYearsFromNow = datetime
22-May-2029
N = datetime('now')
N = datetime
22-May-2024 21:18:40
y = years(fiveYearsFromNow-N)
y = 4.9970
But you may instead want to compute a calendarDuration instead of a duration. You can do this with the between function.
difference = between(N, fiveYearsFromNow) % Just shy of 5 years by timeofday(N)
difference = calendarDuration
4y 11mo 29d 2h 41m 19.759s
To correct for the fact that fiveYearsFromNow represents midnight on May 22, 2029 you can add timeofday(N) to it so fiveYearsFromNow and N represent the same amount of time past midnight on their respective days.
T = timeofday(N)
T = duration
21:18:40
difference = between(N, fiveYearsFromNow+T)
difference = calendarDuration
5y

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