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POSIXt
Convert POSIXt date time object to character representation in UTC time zone.
format_time(x)
If x is of class POSIXt, a character vector, otherwise x itself.
x
(POSIXt) vector of date time values or anything else
Date times are stored as string representations expressed in the UTC time zone. The storage format is YYYY-MM-DD HH:MM:SS.
YYYY-MM-DD HH:MM:SS