This document provides tips for using prepositions of time in English. It explains that "at" is used for hours, such as at 7 o'clock. "In" is used for months, years and seasons, like in January or in 1996. "On" is used for days and dates, such as on Sunday or on February 14th. It also provides examples of where to find further information and practice, including at the library or at the Learning Center.