Professional Time Calculator is a powerful and advanced time calculator designed for professional use. It is designed for speed, convenience, and ease of use. In the long run, this app will save you countless hours over other apps. It is packed full of useful features, and is a pleasure to use. No wheels to spin, no text boxes to fill in. That's just too slow and cumbersome. With this calculator, you only need to conveniently tap buttons just like on a real calculator. Functions need only one button tap to use. FAST. EASY. POWERFUL.Here are some of the features:* Standard time calculator mode, which calculates time duration (difference) between two time points e.g. "From 12:45pm Today to 3:36pm Tomorrow = 26hrs 51mins". You can enter either am/pm time such as 3:36pm or 24hr clock time such as 15:36. You can also include SECONDS in your time if you want to, e.g. 12:45:30pm (30secs). You can also project time forward or backward, e.g "6:58pm Today add 13hrs 38mins = 8:36am Tomorrow". And "6:58pm Today Subtract 22hrs 45mins = 8:13pm Yesterday". * Time Arithmetic mode, which can do all 4 arithmetic calculations: Plus, Minus, Times, Divide. E.g. You can do "3hrs 36mins + 6.68hrs = 10hrs 16mins (or 10.28hrs)" , and "3hrs 36mins x 16 = 57hrs 36mins (or 57.6hrs)". You can enter your input in decimal format such as 3.58hrs, or enter your input in non-decimal format such as 3hrs 34mins. The answer is available in both formats.* Time Adder mode, which allows you to quickly and easily add up a long list of time durations. For example, if you have a long list of time durations such as 3hrs 25mins, 5.58hrs, 7hrs 12mins, 6.91hrs, up to 100 values, you can quickly and easily enter them to add them up to get the Grand Total, the Average time duration, and the Lowest and Highest values. And they would all be recorded onto the calculator's tape for you to email or copy.* Standard Date Calculator mode is used to calculate the duration (difference) between two dates. For example, "From July 17, 1983 to Today Aug 25, 2013 = 32yrs 01mth 08days". You can also project backward or forward to see what the date would be in the past or in the future. For example, you want to find out what date it was exactly 3yrs 6mths 10days ago: "today Sun, Aug 25, 2013 Subtract 3yrs 6mths 10days = Mon, Feb 15, 2010". You want to find out what date it would be 9mths 10days from today: "today Aug 25, 2013 add 00yrs 09mths 10days = Wed, Jun 4, 2014". You can also enter any date, and this app will tell you which day of the week it was/will be. For example, enter "Jun 10, 2014" and it will tell you that it will be a Tuesday. Enter you birthday e.g "July 17, 1983" and it tells you that it was a Sunday. * CUSTOMIZABLE: skin can be changed and customised.* TAPE. Tape is available which records all calculations on it. You can remove any calculation from the tape if you wish to.* ADD NOTES: You can also add notes to each calculation. * EMAIL. You can email the tape to yourself or others.