how to calculate duration of time
1 iv)Click to fill in the current time and date. 2  v)Go to the date for only duration calculation. 3  vi)Click to fill the start of the day. 4  vii) Click to fill 12 am noon.  viii) Click to fill the end day, date, month, year hours, minutes, seconds and then click to calculate duration.
1 i)Use either 24 hour format or 12 hour format. 2  ii)Use number 1-12 for the months of year e.g. 3  iii)Use four digits to calculate little before time duration unless you really want to calculate thousands of years back.  iv)Click to fill in the current time and date.