Le 01/04/2022 à 08:40, Jeff Newmiller a écrit :
> Both R and Excel assume a date is associated with every time object. In
> Excel, when you show a date it is an integer number of days since 1899-12-31
> (due to a mistake made early in programming it). Whenever you show a time, it
> it merely displaying the time portion (fraction of a day) of a date/time. The
> date part of that value may or may not be 1899-12-31.
>
> With this in mind, you are tilting at windmills hoping to import a "pure
> time" because no such thing exists in either program. You can choose to
> render a `POSIXct` as showing only the time portion when you convert it to
> character if you so choose.
Thanks for the infos. Yes, this is exactly what I did yesterday with
POSIXct > POSIXlt to go ahead. However I wanted to understand fully what
happened, hence the call to the list. Jeff and Andrew, now eveything is
clear to me thanks to you...
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