Exact Time and Ordinary Time

EXACT TIME AND ORDINARY TIME

Exact time                                           –                the correct number of days for each month is used. For

example, 31 days for March, 30 days for June and so on. When using the exact date, the total number of days in a year is 365 or 366 if it is a leap year.

Ordinary/Approximate time            –                we assume each month to have 30 days, even if that month does not

actually have 30 days. Thus, each month from January to December has 30 days. Using ordinary time, the total number of days in a year is assumed to be 30 days. Using ordinary time, the total number of days in a year is assumed to be 30 days multiplied by 12 months i.e 360 days.  

Example 8

Find the exact and ordinary/approximate time between the following dates.

a)     From 23 March 2009 to 12 August 2009.

b)    From 11 January 2012 to 4 April 2012.