Mathematics for IGCSE & O level - Time (Section 1 - No. 25)

Times in the morning have the same digits when converted to the 24-hour clock.

60 seconds = 1 minute, 60 minutes = 1 hour, 24 hours = 1 day, 7 days = 1 week

Times in the afternoon have 12 added to the hours digits when converted to the 24-hour clock.

Local time varies in different countries, depending on longitude.