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Here is a simple calculation for everyday living. Examples: What time would it be 7.5 hours after 9:30AM? What time would it be 8 hours after 10:30AM? Solution 1. Compute CurrentTime+TimeToElapse 2. If the Sum is less than or equal to 12:00, the Sum is your answer. 3. If the Sum is more than or equal to 12:00: a. Subtract 12:00 from the Sum b. Switch from AM to PM or PM to AM depending on the which side CurrentTime is Examples Example1 7.5 hours after 2:00PM 2:00+7:30=9:30PM (we don't switch from PM to AM since the Sum is less than 12:00) Example2 7.5 hours after 9:30AM 9:30+7:30=17:00 17:00 is greater than 12:00   So we subtract 12:00 from the Sum -> 17:00-12:00=5:00 Then we switch from AM to PM Therefore the answer is 5:00PM Example3 8 hours after 10:30AM 10:30+8:00=18:30 18:30-12:00=6:30 Switch from AM to PM: Answer is 6:30PM

Here is a simple calculation for everyday living. Problem How many hours are there from 9:30PM to 5:00AM, without running the hours in your fingers? What about from 10:30AM to 4:00PM? Solution Case 1 If both StartTime and EndTime are in the AM or PM, simply subtract StartTime from EndTime Example Start Time: 8:00AM ; End Time 11:30AM   Time Difference-> 11:30-8:00= 3 hours 30 mins Case 2 If one is in the AM, the other in the PM Formula: (12:00- Start Time) + End Time Example 1 Start Time: 9:30PM ; End Time 5:00AM   Time Difference: (12:00-9:30)+5:00 = 7hours 30mins Example 2 Start Time: 10:30AM ; End Time 4:00PM   Time Difference: (12:00-10:30)+4:00 = 5hours 30mins

Here is a simple calculation for everyday living. Problem There are events, meetings that sometimes happen on the 1st, 2nd,3rd or 4th day of the month. For example, some activities could be held every 2nd Sunday of the month or 4th Monday of the month. So how do you know that a date is the 2nd Monday or 4th Sunday of the month? Solution Divide the date by 7. If the quotient is a whole number, that's your answer. If it's not, the answer is obtained by rounding the quotient to the next whole number. Examples Example 1 December 14 is a Monday;   14/7=2; 2 is a whole number.   So December 14 is the   2 nd Monday of the month. Example 2 Today is Sunday, October 25.   25/7= 3. something 3. something   is not a whole number, so round it up to the next whole number, which is 4. So October 25 is the   4 th Sunday of the month. Notes In technical terms, the formula is Ceiling(Date/7) where Ceiling is a function that rounds up non-who...