Spanish in Mexico
Mexico uses the 12 hour clock, although some organizations such as bus companies and TV channels use the 24-hour clock. It is always acceptable to ask a passerby for the time.
Although one is expected to be prompt for business appointments and school, one is not expected to be on time when meeting friends and family. On these occasions, one can arrive from half-hour to an hour late.
Most businesses are open from nine in the morning to two in the afternoon, and from four to eight in the evening. Banks are open from nine to two or from nine to five. Government officials work from nine to five. Elementary schools, which have two shifts, run classes from eight to one in the afternoon, and from one to six in the evening. Secondary schools and high schools have a longer schedule, opening at seven in the morning and ending at two or three in the afternoon.
"Asking for the Time"Transcript document: