# New Ticket Created by Zefram # Please include the string: [perl #127005] # in the subject line of all future correspondence about this issue. # <URL: https://rt.perl.org/Ticket/Display.html?id=127005 >
Internally DateTime allows its seconds value to be any kind of numeric value in the right range, but when producing Str output in ISO 8601 format it limits the displayed seconds value to integral microseconds. It attempts to round accordingly, but it screws up by only rounding the seconds value in isolation: > DateTime.new(:year(2000), :second(59.9999999)).Str 2000-01-01T00:00:60.000000Z It produces invalid output like this whenever rounding up in the last microsecond of a minute. (If there's a leap second, :second(60.9999999) is rounded to ":61.000000".) The rounding ought to instead wrap the seconds value and be carried to the minutes value, and to the hours if the minutes wrap, and so on. Or from another point of view, one should round the DateTime value, and then express the rounded DateTime exactly, rather than round the expression. -zefram
