py3: use encoding.strfromlocal() instead of pycompat.sysstr()
opts['dateformat'] is provided by the user and can be encoded in local encoding.
Thanks to Yuya for catching.
Differential Revision: https://phab.mercurial-scm.org/D3642
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}