Pseudo-variable `now` does not work as intended on Linux machines.

[c-lipka]

On Linux machines, the value returned by now may be based on local time, instead of UTC as documented and intended.

This is due to an undocumented issue in boost::posix_time::microsec_clock::universal_time().

[c-lipka]

Technically, this issue is fixed in v3.8.0, to be released in v3.8.0-beta.2.

However, the bug has highlighted the shortcomings of the current design, in that the typical use cases for the datetime function would be better catered to by a local time based solution. A mechanism should be devised to make local time output available as an intentional feature.