Added extra tests for datetime .date and .time objects. Issue #3.
Added extra tests for datetime .date and .time objects. Issue #3.

jmcnamara/XlsxWriter,Thhhza/XlsxWriter,jvrsantacruz/XlsxWriter,gechong/XlsxWriter,Thhhza/XlsxWriter,liukaijv/XlsxWriter,jkyeung/XlsxWriter,yaojingwu1992/XlsxWriter,liukaijv/XlsxWriter,jkyeung/XlsxWriter,gechong/XlsxWriter,mdeemer/XlsxWriter,applicationdevm/XlsxWriter,jvrsantacruz/XlsxWriter,Thhhza/XlsxWriter,jmcnamara/XlsxWriter,jkyeung/XlsxWriter,mdeemer/XlsxWriter,yaojingwu1992/XlsxWriter,applicationdevm/XlsxWriter,yaojingwu1992/XlsxWriter,seize-the-dave/XlsxWriter,jvrsantacruz/XlsxWriter,liukaijv/XlsxWriter,applicationdevm/XlsxWriter,mdeemer/XlsxWriter,seize-the-dave/XlsxWriter,seize-the-dave/XlsxWriter,liukaijv/XlsxWriter,mdeemer/XlsxWriter,jvrsantacruz/XlsxWriter,gechong/XlsxWriter,Thhhza/XlsxWriter,applicationdevm/XlsxWriter,jkyeung/XlsxWriter,gechong/XlsxWriter,jmcnamara/XlsxWriter,seize-the-dave/XlsxWriter,jmcnamara/XlsxWriter,yaojingwu1992/XlsxWriter