How do you say 'calendar' in mexican-spanish ?

When a feminine singular noun begins with a stressed –a or –ha, the masculine article un or el is used instead the feminine una or la, to aide in pronunciation. When the same noun is plural, the feminine article unas or las is used. The following feminine nouns use the masculine article when singular.

Explanation:

When a feminine singular noun begins with a stressed –a or –ha, the masculine article un or el is used instead the feminine una or la, to aide in pronunciation. When the same noun is plural, the feminine article unas or las is used. The following feminine nouns use the masculine article when singular.