Restrict supported date interval

[superbobry]

It looks like strptime and strftime behaviour for dates before 1900 varies across platforms, so I think we should throw an error on such inputs.

(tempo_dev@yooki)13> tempo:parse(<<"%Y">>, {unix, <<"1505">>}).  %% OS X
{error,format_mismatch}

[si14]

Besided undefined behaviour there is an obvious bug there:

(tempo_dev@si14-laptop)6> tempo:parse(<<"">>, <<"">>, unix).                 
{ok,0.0}     <---- WAT
(tempo_dev@si14-laptop)7> tempo:parse(<<"%Y">>, {unix, <<"1505">>}).
{ok,-14674003200.0}

[superbobry]

What kind of behaviour would you expect? I'd say badarg for both of them.

[si14]

Yup.

[superbobry]

The first case is fixed in 593cd5c, the latter is hard to validate, unfortunately. Any suggestions?