February has 28 days in a common year and an extra day in a leap year the 29 thday of February is called the leap day.Ī year always has 12 months. All months have either 30 or 31 days except for February. It is also common for people to talk about a work week, usually 5 days (Monday - Friday) and weekends (Saturday and Sunday).ĭifferent months have different numbers of days. It is common to talk about 'half an hour' (30 minutes) and 'quarter of an hour' (15 minutes). These 'leap seconds' are used to keep our clocks aligned to the earth's rotation around the sun. once every 18 months) a minute can have 61 seconds. Seconds are also commonly abbreviated to sec.Ī minute nearly always has sixty seconds. The symbol 's' is used to denote a second. The second is the International System of Units (SI) measurement for time. The basic units of time, which allow you to do calculations involving time, are: Unit
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However, with a bit of application, you too can learn how to calculate with time, and gain confidence in manipulating hours, minutes and seconds. Even otherwise highly numerate people have been known to throw up their hands in horror at the thought of adding together times.Ī system like time, which is not decimal, can be counter-intuitive and requires concentration.
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