Watch this video, to which I added a short demo of Camtasia Studio, the software I'm using to create videos. Your example of 1,555,200 seconds brings you to 7:00:00 AM. So if you want to add seconds, you need to divide the number by the number of seconds in a day, being 86400 (24 * 60 * 60). If you are adding a number to a datetime as a new column, then you are adding days. Select the active cell or cells where we need to sum the time, say D2:D6 in this example, Then on the Home tab, in the Editing section choose AutoSum. For PM hours, add 12 to the number to convert it to 24-hour time. AM hours are the same in both 12-hour and 24-hour time. If the times are not already in 24-hour time, convert them to 24-hour time. The goal is to subtract the starting time from the ending time under the correct conditions. environments, so calculating back to 0 brings you to December 30, 1899, 12:00:00 AM (midnight)). First, identify the starting and an ending time. so day 60 in Excel is the non existing day 61 is both in Excel and the Power. In cell D2 write this formula and copy it in cells below: C224B2 This will work in all versions of Microsoft Excel as it is simple math. And thats not where well wrap it up As an extra piece of advice. Now we can multiply it with C2 to get the correct value. Ill guide you through this tutorial which will show you how to sum time in Excel. When we multiply cell B2 with 24, we get 44 as the whole number. environment is based on the numbering in Excel starting with 1 on, but unfortunately the year 1900 was considered a leap year. So to get the hours as a number, we need to multiply the cell with 24 first. First of all, your numbers of seconds are much more than something like a few hours (or a part of it, as in your original example), so it doesn't make sense to add it to a time without date, unless you acually want to start at December 30, 1899, 7:00 AM.
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