It means vingt_trois
Il faut vingt-trois degrés.
'twenty to six' in french is 'vingt à six'
Twenty past eight is "huit heures vingt" in French.
twenty five is 'vingt cinq' in French.
You say the hour "vingt cinq" for example 07:25 is <<sept heure vingt cinq>>
vingt
twenty past two is 'deux heures vingt' in French.
To say "the twenty fourth of June" in French, you would say "le vingt-quatre juin."
Vingt - trois
Twenty five to eight is 'huit heures moins vingt cinq' in French.
vingt cinquième
vingt-troisième.