Many thanks a +0 to explicitly convert to number is fixing the issue.

> If I were to supply a value for nano- or microsecond, I would have thought that an integer would have been sufficient, and not to have supply a string for the value.

The string is an artefact from an sprintf to convert non-nanos to nanos.

> All of the numbers must be integers.

It's Perl's dogma to treat all convertible scalars alike, including integers and strings of integers.

  DB<75> use warnings; print "001"+"001"     # no warnings
2
  DB<76>

[download]

I read the docs as "don't pass real numbers".

Keep in mind that the nanosecs could have been read from a file and come as string inside a variable.

DT::D only fails in this special case and I suppose it's because there is an inner test for falseness to see if the nanosecs are 0 ... but "000000000" OTOH is true.

some minutes later

My Boolean theory seems to be right, passing "0" works fine (false), but "00" fails (true).

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

In reply to Re^2: [ DateTime::Duration ] off by one problem with negative seconds by LanX
in thread [ DateTime::Duration ] off by one problem with negative seconds by LanX

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