This program parse rfc3339 format, and create rfc3339 format.
But this program does not support millisecond format.
・YYYY-MM-DDTHH:MM:SSZ
・YYYY-MM-DDTHH:MM:SS+HH:MM
・YYYY-MM-DDTHH:MM:SS-HH:MM
・YYYY-MM-DDTHH:MM:SS.sssZ(not support)
・YYYY-MM-DDTHH:MM:SS.sss+HH:MM(not support)
・YYYY-MM-DDTHH:MM:SS.sss-HH:MM(not support)
If you want to use, please exec 'make'.
This program does not have the other dependancy(but c++ normal dependancy).
In future, I'll use Regex. So, this program will support all formats.