In Google Spreadsheets I don't like the built-in abbreviations of the month names in date formats. I especially hate the fact that abbreviations for month names doesn't have a fixed length. I think the use of a period in those abbreviations is ugly, useless and unnecessary.
1-ene.-2017 1-febr.-2017 1-mzo.-2017 1-abr.-2017 1-my.-2017 1-jun.-2017 1-jul.-2017 1-ag.-2017 1-set.-2017 1-oct.-2017 1-nov.-2017 1-dic.-2017
AFTER ANSWER ACCEPTED:
1-Jan-2017 1-Feb-2017 1-Mar-2017 1-Apr-2017 1-May-2017 1-Jun-2017 1-Jul-2017 1-Aug-2017 1-Sep-2017 1-Oct-2017 1-Nov-2017 1-Dec-2017