Formatting dates sometimes returns January zeroth about dfdatetime

[joachimmetz]

Thx for the report I'll have a look as soon time permits

[joachimmetz]

Issue is that interface._GetDateValues does not correctly handle number of days (in year) of 0.

Pending fixes: #135

With fix:

In [2]: from dfdatetime import posix_time

In [3]: posix_time.PosixTime(31511228).CopyToDateTimeString()
Out[3]: u'1970-12-31 17:07:08'

In [4]: posix_time.PosixTime(126189827).CopyToDateTimeString()
Out[4]: u'1973-12-31 12:43:47'

[joachimmetz]

Changes merged and new pre-release made available.

[creideiki]

Thanks! I just tried the 20190116 release on my real data, and it solves the problem.