To solve for speed or rate use the formula for speed, s = d/t. 0 -- 1440 min/day -- or. After the ‘if’ word, we’ll start typing out the condition itself – the ‘Start Work’ time (the value in cell C7) is greater than the ‘End Work’ time (the value in cell D7), which is true for the working time that spans midnight. StartOfHour: Returns the start of the hour. ; Divide the difference by the average: |a - b| / ((a + b) / 2). Figure 2. There’s a specific formula to total hours worked past midnight in Exce. And now, let's see how our time difference formula and time codes work in real worksheets. Present the result in the standard time format. In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. The simple formula shown above doesn't work if the start time is before midnight and the end time is after midnight. . Using Excel TEXT Function to Calculate Time Difference in Hours. The formula is, =D5-C5. I have formatted A1 and A2 as "Time, 1:30 PM. = (B1-A1)*1440. 83 or something like that. Calculate hours between two times after midnight with formula. I need to subtract the time out from the time in minus a 30 minute lunch break and be able to show if they were under 8 hours worked or over. 67 hours. 1. If start and end times span midnight, you will need to adjust the formula as explained below. On the Celsius. Therefore, dividing the (positive) difference of the SAS time values (i. Most entries fall within the same day's 24 hour limit, so a simple forumla "=b1-a1" will do. Read on to find out more. If the value in C7 is greater than the value in D7 the value in D7 is from the next day. Time interval formula To calculate time difference, we convert both time values to seconds since midnight using the following formula: time m = hh*3600 + mm*60 + ss 8PM to 5AM for example. The time difference formula below always works. End Time (high) = ws_stsked. Hello everyone, I need some help. I feel like Google Sheets should have a simpler. You can therefore multiply the difference by 24 to get the result in hours, so your formula would likely look like this: =24* (End-Start) Make sure to set your calculated column to return a number instead of text. 45 as the difference in midnight minus 8/1/2019 1:10 PM. If you have cells with time in Excel, and you subtract one cell from another, you may end up with the pound symbols. 1:00 am. To get the correct calculated result between two times over midnight, you can apply the following formula: 1 . Easily calculate the time before midnight in C#. Type in. In the next cell I enter the "end time", i. Register To Reply. Here is my attempt to measure time difference in batch. with. If you land in California, you would list the time as it was in the Pacific time zone. In Excel I have been trying to find an easier way to calculate a time difference where the times cross. Formula To Calculate Time Difference Crossing Midnight - Excel. So if you are following Niek's suggestion to input times as hh:mm and subtracting. This works great and gives me the hours worked in a day until I enter a value after midnight for the end time. For example, to create a time value of 3:30 PM, you can use the formula =TIME (15, 30, 0). 2. getting the difference bewtween two times accounting for midnight cross overCalculating time past midnight. You also can use the TEXT function to calculate the time difference (hours) in Excel. Question/Issue: Need Formula to calculate number of night hours worked in a shift, using 4 values (Detailed below). " In this case both times belong to the same date and wake_time>bed_time. This is problematic from the view point that early morning times are less than the late times of. I have a solution based on A clever formula from Daniel Maher that will calculate time within a period. I have tried the function Duration. The formula in cell C2 is =B2-A2 and the formula for the averages in cell A7 is =AVERAGE (A2:A6) Custom number formatting for Column C: uses h "hrs" mm "min" and Columns A-B use m/d/yyyy h:mm AM/PM. Calculate Time Difference exclude non-operating hours and holidays. I have seen the sumproduct before and it's tried and tested, but I have yet to find a formula that does all of this AND accounts for if the start time is prior to midnight but the end time is after midnight. In the next cell I enter the "end time", i. Is there any formula to calculate Start time to End time with excluding lunch time? Here is example : Lunch time :12:00pm to 1:00pm. My guys clock in and out at the start and end of shift and start and end of lunch. Is there any formula to calculate Start time to End time with excluding lunch time? Here is example : Lunch time :12:00pm to 1:00pm. . Start Date 2. distance = rate x time. Duration Process :6 hours. Re: Calculate time up to midnight. hours * 60 + departureTime. TimeOfDay, endTime. Yuta Smith's schedule is June 8,2020 11:00 PM- June 9,2020 8:0AM. In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. is hour 0, and the hour from noon to 1 p. This particular example calculates the number of hours between the starting time in cell A2 and the ending time in cell B2, assuming midnight occurs between these two times. You can do it this way: select *, convert (time, convert (datetime, timeto) - convert (datetime, timefrom)) from table1. 46 minutes to 60 minutes = one hour. Since a day has 1440 (24*60) minutes, we multiply the. See what time will it be in XX hours, or what time will it be in XX minutes. You can use the following formula to do so: =(B2-A2 +TRUE)*24. Hello. In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. And now, let's see how our time difference formula and time codes work in real worksheets. 3 Answers. summing the times and if you format as [h]:mm:ss. There's a little trick you can use to deal with times crossing midnight. You use the subtraction operator (-) to find the difference between times, and then do either of the. Looking at this example, you might wonder why C10 works, but C11 doesn’t. For example. 1. 16 minutes to 30 minutes = 1/2 hour 30. Select All. If your time runs across midnight in Exc. or simply format the time cells as Custom, [h]:mm. while i am able to identify when the shift crosses midnight, i am not able to correctly calculate the total number of hours, as 00:00 is tricky, and every formula i tried for hours before midnight, when applied to hours after midnight, throws everything off, and vice-versa. My problem is that the results half only been in full hours. Input the Year, Month, and Day, as well as the Right Ascension (Epoch J2000) for the object of interest, then click the Compute button. I need to subtract hours or minutes from a given time. For example,. e. For each 6 hours, use 1 minute for the acceleration of time: = 1 minute. So I used TIME to add or subtract hours to give a GMT hour (in my columns I and J). Looks like no one’s replied in a while. The calculator below gives a time difference in years, months, days, hours, minutes, and seconds between two time points of two different Earth locations. Description (Result) 4 =INT((B2-A2)*24) Total hours between two times (4) 5 =(B2-A2)*1440. To use the TIME function, simply enter the hour, minute, and second values as arguments in the function. Is there any formula to calculate Start time to End time with excluding lunch time? Here is example : Lunch time :12:00pm to 1:00pm. To clearly see this, change the number format of the values in cell A2, B2 and C2 to General. Formula To Calculate Time Difference Crossing Midnight - Excel. Enter this formula: =(B2-A2+(B2<A2))*24 ( A2 is the earlier time, B2 is the later time, you can. The dough need to. Find time duration in hours, minutes and seconds between any two times. Now we need to indicate what value Excel should work with if. DATEVALUE function. 46 minutes to 60 minutes = one hour. And if the value already contains a text, make sure it is valid. 6. All works fine until the calculation goes before 24:00. In the Queries & Connections panel, right-click the “TimeWorked” query and select Reference. This formula will help you calculate the hours difference between two times, even when the end time crosses midnight (Ex 7pm - 2am). Time Difference Formula. In this approach, we assume we just need to compute the difference between the two dates as whole years, as is the case when you want to compute your age as at the last birthday. 16 minutes to 30 minutes = 1/2 hour 30. Duration Process :6 hours. You provide the start time, the end time, and the desired interval, and the INTCK function returns the difference in seconds, minutes, or hours. A good thing to remember is that times are always a fraction of 1. having a bit of a problem with times crossing midnight. In interval notation: [start, end) Now with regard to crossing the midnight boundary:@jbarker2160 - Given that the start time may be greater than the end time due to crossing over midnight it is a good idea to add in a Boolean like '(ClockOut+(ClockOut<ClockIn))-ClockIn. Now, Orange line is starting from time. A star's position is fixed in that system and it will be always at the. Here's a solution that supports finding the difference even if the end time is less than the start time (over midnight interval) such as 23:55:00-00:25:00 (a half an hour duration):In the example shown, "lower" is lower bound for the period of interest, and "upper" is the upper bound. Simple duration calculation When start time and end time occur in the same day, calculating duration in hours is straightforward. Learn how to do time calculations with practical examples and understand common time. Due to it being a negative, it comes up as 'error'. So given the following. interval = millisceonds; timer1. I need to calculate two columns of time. I need to return the answer both in time (custom hh:mm) and also in decimals. Duration Process :6 hours. Is there any formula to calculate Start time to End time with excluding lunch time? Here is example : Lunch time :12:00pm to 1:00pm. So, when you multiply the time difference by 24, you will get the time duration in hours. formula to calculate time difference crossing midnight. "Midnight" is 00:00:00 and is only recognized as belonging to the following day. Similarly, we do the adjustment for the end time, calculating the effective end time (eEff) considering the next day when the end time (end) is lower than the start time (start). I expect to see 10. Assuming that cell B1 contains start time i. We subtract time/dates in excel to get the number of days. When you cross it, you either. Inverse Proportionality of Speed & Time: Speed is said to be inversely proportional to time when the distance is fixed. I have a loan with a variable beginning balance and irregular payments. Standard times are shown as positive or negative deviations of UTC, that's why time differences are calculated by determining UTC and calculating each time zone from there. ) $endgroup$If I wanted to subtract two military times to get minutes what formula would I use. EDIT: Based on the comments, you will need a formula that remove the Z part of the time. . Excel assigns the number 1 to the 24 hours of a day. I'm using the 4 digit military time and also I need the formula to calculate across midnight. Get Difference in Seconds. Time. The above formula will give you the total number of hours elapsed between the two-time values. Time_In is when they started work. How do I calculate this time. 46 minutes to 60 minutes = one hour. Example: Start time: 23:50:00 End time: 00:15:00 How would you formulate an equation to determine the duration of time or differnce between the start and end time? Hi Guys I would appreciate if someone can assist when a formula that pick the max date even if hours pass midnight, attached a file for reference thanks in advance Mehdi Return min/maxi date time - crossing midnight In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. If the value in C7 is greater than the value in D7 the value in D7 is from the next day. 25*24 =6I have tried using a standard formula to calculate the time difference between two bike rides in Excel. that's crossing the meridian at a particular time is constantly changing. select * ,datediff (second, cast ( [schedule_deptime]as time), cast ( [prev_announce_time]as time)) as kpi1_delta. Hello There, I am a basic to mid level excel user and I have been tasked with creating a "border crossing calculator" based on arrival time to a US border town factoring in the hours of operations (open/close times) for commercial traffic at said border. The time on the top is local time and on the bottom is Z time which simply follows along with the local time by adding/subtracting the set time zone. This Excel date formula will calculate the number of days between two dates: =DATEDIF (A1,B1,"d") The formula takes two cells, separated by commas, and then uses a "d" to calculate the difference in days. Write down the times on a sheet of paper using the local times for the airport. So if Start is greater that Stop it adds 1 to Stop. If this is the case, then you have two amounts to calculate. 2. this formula gives a Sun-synchronous inclination of 98. Cell "G" is calculating the hours: = (D2-C2)+ (B2-A2)+ (D2<A2) Cell "E" is converting the calculation in "G" to a decimal number: =G2*24. In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. If the start time is less than the. Then it returns a negative value. Formula To Calculate Time Difference Crossing. Over 7 minutes to 15 minutes = 1/4 hour 15. I want to calculate the number of hours done within 8am till 18:30pm and 18:30pm to 8am. , there are a total of 9 time zones used. Use formula: = (E1+J1)- (C1+I1) we just add the date and time together and subtract the end from start and then format the cell having the formula to show days, hours, minutes. ;. 11-21-2013, 08:33 PM #2. Formulas: Results:. 2. Excel will now work as follows. Enter this formula: =(B2-A2+(B2<A2))*24 (A2 is the earlier time, B2 is the later time, you can change them as you need) into a blank cell which beside your time data, see. For example, if you leave Los Angeles at 09:00 (9:00 am) and arrive in New York at 18:00 (6:00 pm), then the apparent traveling time is 9 hours. You have therefore earned $75. Time is stored as a decimal which represents a fraction of a day. " In this case both times belong to the same date and wake_time>bed_time. Allocates a Date object and initializes it so that it represents the time at which it was allocated, measured to the nearest millisecond. The problem comes when i need to calculate the login and out time. If any are at or after midnight, the calculations are wrong. Looks like no one’s replied in a while. For example lets say on April 31st I have a time of 23:30 and on May 1st I have a time of 00:22. Time crossing midnight. Calculate the Longitude in Time Units. Now, as previously discussed the time difference is based on the day shift. Then, select Count days, hours and minutes between dates option in the. Re: How to calculate hours when it goes after midnight. Start. 2011. So, if start times are in A and end times are in B (starting row 2), try this: = ( (B2-A2)+ (A2>B2))*24. Do the normal end-time minus start_time, and then add either 0 or 1 back to it by checking if the start_time. Note: Date information in time_text is ignored. Following our example above, 56 hours is our base. I have a start time and and an end time and would like to calculate the duration expended between the two. and then update the difference every second. Bij this code you can calculate the difference even over night. Next press Enter. LinkBack URL; About LinkBacks; Thread Tools. Start Time (8:00am). A. Possibly the most elegant and simplest solution is the one in this answer mentioned by fixer1234 in this comment: =MOD (B1-A1,1) Note that it assumes that both values are time values only (or that the date part is to be truncated), i. . View Profile View Forum PostsTime differences between time zones are simple to work out due to the Universal Time Coordinated (UTC). 3. JUST USING TIME AND CROSSING MIDNIGHT. "1d 2h 3m 4s + 4h 5s - 2030s" is an example of a valid expression. eg. The formula for calculating the Local Time equivalent for Local Solar Time is LST = LT + TC 60 L S T = L T + T C 60, where TC T C is the Time Correction factor TC = 4(Longitude − LSTM) + EoT T C = 4 ( L o n g i t u d e − L S T M) + E o T. Here 86400 is the total second in 24 hours and when you enter this formula it will return the difference in start and end time in seconds. 1 Answer. Originally Posted by TMS. Zulu time is another name for Coordinated Universal Time (UTC), which is the time at 0° longitude at the Greenwich Meridian. If applicable, differences to standard times as a result of DST also. Then, the resulting seconds should be used as a new unix timestamp and read formatted in whatever format you want. The difference would be 3 hours. Right-click the new field heading in the table and select the Field Calculator. Enabled = true; Don't forget to disable the timer when handling the tick. (based on collections) Would like to enter payment and date. Cells (rfnd, cfnd - 2) This issue is when the end time is midnight (ie 0:00AM) The line in blue catches whether the end time is midnight. e. Duration Process :6 hours. In one cell I enter the "start time", i. Year, today. DateTime today = DateTime. Add the three terms to get the GST: = 4:15 + 6:05 + 0:01 = 10:21 Subtract the Right Ascension of the star from the GST to get the Longitude in time units: = 10:21 - 6:45 = 3:36. 3. Likely the most well-known include Eastern, Central, Mountain, and Pacific Time Zones. $egingroup$ To give a sense of the accuracy I need: I want to use the solar transit times to calculate the difference in the RA of the sun between successive (actual) solar days. Just like any other language; convert your time periods to a unix timestamp (ie, seconds since the Unix epoch) and then simply subtract. I have a loan with a variable beginning balance and irregular payments. For instance, If the border closes at midnight, and our truck arrives at 10 PM, we should in theory be able to get in line and get across (but I still want the 12 hours crossing time factored in for padding) If we arrive at 11PM and the border closes at. IF after midnight, 24 hours are added to the finish time to allow the calculation of Finish time minus Start Time to still work. 999. Enter start time in A2. We have a client who will pay using the 1/4, 1/2/ and 3/4 of an hour increments as follows: From the hour mark to 6 minutes = 0 time paid. Formula To Calculate Time Difference Crossing Midnight - Excel. Calculating time difference when times are cross midnight. For example, I need to subtract 20:22 (A1) from 20:54 (B1) and get 32 (for minutes) (C1) Also, would the formula be different crossing midnight. e. 30AM to 7. =IF ( (end-start)<0, (end-start)*24+24, (end-start)*24) If you want to see hours and minutes you'd need to. Browse; Search; Sign inIs there any formula to calculate Start time to End time with excluding lunch time? Here is example : Lunch time :12:00pm to 1:00pm. Note that if we let V 1 = 7 and V 2 = 5 we would still have a difference of 33. Date-time difference calculator usage. 46 minutes to 60 minutes = one hour. Calculating Time With 1/4, 1/2/ And 3/4 Of An Hour Increments - Excel. I need to be able to determine if a time range intersects the other time range and by how much and then sum the total number of minutes of that intersection. In order to use this calculator, you should enter the values of both specific time points in hours, minutes, and seconds. In the Group By dialog box, set the field to be grouped as “Name”, the new column name to “Time Worked”, and set. - I have a time in a1is there a formula to find out if the the time. I have a series of times and I am trying to find the difference in time between two values which is fine for a normal day however some times pass midnight e. Unit - the time unit to use when calculating the difference between two dates. 4: Aug 25, 2007: Countifs with different restrictions: 1: Nov 29, 2012: Averaging Duration of Time: Duration Longer than 24hr: 2: Apr 10, 2008: Convert times to text string: 3: Apr 21, 2010 [NEWBIE] date/time diff: 4: Jun 25, 2009: formula to calculate time difference crossing midnight: 3: Aug 17. 🔗 Steps: Type the following formula on cell D5. All three arguments are required: Start_date - the initial date of the period you want to calculate. Full 24 examples for 2 time zones. Example: Start time: 23:50:00 End time: 00:15:00 How would you formulate an equation to determine the duration of time or differnce between the start and end time? Get Difference in Seconds. In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. If I wanted to subtract two military times to get minutes what formula would I use. You use the subtraction operator (-) to find the difference between times, and then do either of the. Present the result in the standard time format. so the formula i am using is: = (200-A1*0. To get the correct calculated result between two times over midnight, you can apply the following formula: 1 . Here is the. How do I calculate the time duration in minutes between two times when the first time is before midnight and the second time is after midnight by considering non work hours ? For example, need to calculate the work hours in minutes between 03/17/2021 07:00PM and 03/18/2021 9:30AM the next next. play with start and end. In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. Is there any formula to calculate Start time to End time with excluding lunch time? Here is example : Lunch time :12:00pm to 1:00pm. Local Nav Open Menu Local Nav Close Menu. Spreadsheet Purpose: WORK HOURS per MTH with breaks & night time rate exta including Year Summary of Hours, Pay & Miles. The time difference is calculated in days. So for the purposes of calculation, the time 0100 is actually treated as 2500, 0200 is 2600 and so on. Ask Question Asked 3 years 11 months ago. . There are two approaches that you can take to present the results in the standard time format (hours : minutes : seconds). 22 actual time with seconds in place. Register. Time calculator online: add time or subtract time to and from a given date and time (Time Adder). Method 1: Calculate Time Difference Between Two Times by Direct Subtraction. a The islands of Cape Verde are to the west of the African mainland. In decimal form, this is 7. I have a solution based on A clever formula from Daniel Maher that will calculate time within a period. TEXT(C5-B5,"h"" hrs ""m"" mins """) This is an example of embedding text into a custom number format, and this text must be surrounded by an extra pair of double. Example: Start time: 23:50:00 End time: 00:15:00 How would you formulate an equation to determine the duration of time or differnce between the start and end time?There are several ways to calculate the difference between two times. In Michael's work there is a subtle but often important difference between the time 24:00 and the time 00:00, but Excel doesn't support a time of 24:00. m. Duration Process :6 hours. TimeOfDay) Share. Calculate Late And Under Time - Happy Day to all Can you please help me A1 time. Find below the sample data and details for your reference. You have to account for crossing midnight. Formula is: 29:00 -23:00 results should be 6 hours. To apply that formula, follow below given steps:-. Show Printable Version;. . Time. Selection of the data range to set the time format. Example: 3:00 - 5 hrs = -2 Be correct answer would be 22:00. TotalMilliseconds; You can use this to set a Timer: timer1. Improve this answer. In this moon calculator, you may find out the time of sunrise and sunset. In addition, Daylight Saving Time / Summer Time and automatic time zone. Hi, Thanks for the quick reply! I formatted as H:MM but your formula is getting me 7. Now for d1. In other words, everything to the left of the decimal is date and everything to the right is time. 11:00pm *is later than* 5:00am. Duration Process :6 hours. Just my my 5ct advice: Use real calc date + time (datetime) as start and end values and every duration (!!!) in hours simply calculates as =A2-A1 formatted by [HH]:MM. g. Is there any formula to calculate Start time to End time with excluding lunch time? Here is example : Lunch time :12:00pm to 1:00pm. The following formula computes the time difference between the mid-day and the time at which the object's shadow equals t times the length of the object itself plus the length of that object's shadow at noon: Thus, in the first four schools of thought, Asr = Dhuhr + A (1), and in Hanafi school, Asr = Dhuhr + A (2). Start. up the decimal fraction and multiply it by 60. Enter this formula: =SUM((C2-B2)+(E2-D2))*24 into a blank cell beside your time record cells, F2, for instance, see screenshot: Note: In the above formula: C2 is the lunch start time, B2 is the log in time, E2 indicates the log out time and D2 is. TimeSpan diff = d2 - d1; int millisceonds = (int) diff. 30am-10pm. End Time There are no problems if the outage occurs within the same date. I have a generated excel report that shows day and time in this format: I want to calculate the difference between the two, giving the result in hh:mm:ss. Method 2: Subtract the years. anon73440385 May 13, 2021, 11:36am #3. For example lets say on April 31st I have a time of 23:30 and on May 1st I have a time of 00:22. Duration Process :6 hours. Initially, I will determine the hour difference between the two times. Hello All! File & Photo are attached below. Similarly, =ROUND((F2-E2)*24*60)Calendar Generator – Create a calendar for any year. between payment dates. In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. We already have a minuend or a base time we went to be subtracted from. This is very simple to do when the start and end time's are the same time zone, like in the. To avoid these problems, you should always treat time intervals as half-open intervals. LSTM L S T M is the Local Solar Time Meridian, calculated by 15º −ΔTGMT 15 º −. Is there any formula to calculate Start time to End time with excluding lunch time? Here is example : Lunch time :12:00pm to 1:00pm. 6:00 AM). Hi all, i have a start time (from) and and end time (to) of a shift that can cross midnight. Depending on you data structure, the actual time difference formula may take various shapes, for example: Formula. Heres the formula which you. Formula To Calculate Time Difference Crossing Midnight - Excel. One way which results in hours and decimal of an hour is. I'd like the time difference to be in minutes (but that can be done in a separate column formula). "Midnight" is 00:00:00 and is only recognized as belonging to the following day. In order to calculate how much you have earned, we multiply the time (in decimals) by the hourly rate: 7. The difference of time between 11:00pm and 5:00am is -18 hours. Start Time (8:00am)Calculate hours between two times after midnight with formula. Add a comment. In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. Basically, we had to apply one of two formulas to compute variable right_hours_slept: (wake_time-bed_time)/3600 if bed_time is "at or after midnight. At sea level, water boils at 212 o F and freezes at 32 o F. Day, 0, 0, 0). Received Date & Time: 10/29/2010 3:27:00 PMIn the sumproduct formula the times are just examples (I will fill those with times in numerical format). So I used TIME to add or subtract hours to give a GMT hour (in my columns I and J). In your selected cell, type the following formula and press Enter. Full 24 examples for 2 time. 1 only needs to be added if A2A3 otherwise you get 24 extra hours when. First of all, you can calculate the difference between two times by direct substitution. Format the cell containing the formula like this: Format > Number > More Formats > More date and time formats, delete "second" and :. Here 86400 is the total second in 24 hours and when you enter this formula it will return the difference in start and end time in seconds. If you want to subtract a 30 minute break you could do that like this: =B2-A2+ (A2>B2)-"0:30". m. This is the easiest way to calculate a time delta in Google Spreadsheets. In B2, filled down: =IF(TIMEVALUE(B2)>TIMEVALUE("9 PM"),B$1−B2,−MOD(B2−B$1,"1d")) I assumed 9 PM as the earliest "sleep at" time but you could change that if you want. In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. Converts a serial number to a day of the month. Lines of longitude are imaginary lines that travel north to south along the. ,1) is needed just in case the average is in the range "spanning midnight". I need to be able to work out the amount of worked time that fits into a certain time period. Received Date & Time: 10/29/2010 3:27:00 PMRe: "Head Count" of time periods crossing midnight Shout if you want to use formula/Named Range approach to adjust the column ranges automatically. To calculate the percentage difference between two numbers, a and b, perform the following calculations: Find the absolute difference between two numbers: |a - b|. Great question! I think for calculation purposes, a two hour buffer is appropriate for our purposes. However whenever I pass midnight it is not calculating properly.