Time Difference Formula. With the “Name” field selected, click Transform (tab) -> Table (group) -> Group By. 67 hours. 34. There's a little trick you can use to deal with times crossing midnight. 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. The ones that cross midnight on to the next day gives me headache because included in the raw data is the start date and start time for the next day's shift. Formula To Calculate Time Difference Crossing Midnight - Excel. The MOD functions does not work if you use 24 hr / military clock, as it returns 17:30 instead of 06:30 between finish and start. However whenever I pass midnight it is not calculating properly. 18:00 - 00:30 The time difference is 6 hours 30 minutes which I would like returned in a numerical value e. The MOD (. 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. 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? If I calculate TAT for this time period it should show me 1 hour 33 minutes, why because business hours are closing by 5:00 PM on 10/29 so it should not calculate duration after 5:00 PM to until 08:00 AM on next day, however 10/29 is Friday so formula should calculate the duration from 10/29 Friday 3:37 PM to 10/29 5:00 PM and again it should. The difference of time between 11:00pm and 5:00am is -18 hours. 2011. 30am-10pm. Write down the times on a sheet of paper using the local times for the airport. With only a few 00 rows, calculation will be instantaneous. Formula To Calculate Time Difference Crossing Midnight - Excel. Time. having a bit of a problem with times crossing midnight. Formula To Calculate Time Difference Crossing Midnight - Excel. So, when you multiply the time difference by 24, you will get the time duration in hours. Greenwich Mean Time (GMT) is the local mean time at the Royal Observatory in Greenwich, London, counted from midnight. g. A simple formula is used and then a. Start Time (8:00am). Formula is: 29:00 -23:00 results should be 6 hours. Now, as previously discussed the time difference is based on the day shift. The first question is easily answered: if the end time is before the start time, the time span has crossed midnight. Start. Specifically, the command =ROUND((F2-E2)*24) calculates the number of hours between the time values in the cells E2 and F2, rounded to the nearest whole hour. 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). Your duration will be 4 hours and 40 minutes, or 4. For that purpose, you can follow the steps below. Duration Process :6 hours. Then, the resulting seconds should be used as a new unix timestamp and read formatted in whatever format you want. 3. 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. Currently is manual edit of total hours in Month. IsTimeOfDayBetween (someTime, startTime. The result will be displayed in. Duration Process :6 hours. Figure 2. In C2, enter the following formula: =IF (B2<A2,B2+1,B2)-A2. Same as minutes we can also get the difference in seconds. Re: Calculating elapsed time when time crosses over midnight. =(end_time-start_time)*86400. The dough need to. References. 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. Not sure if there's a formula or if it needs the help of a macro. This approach rounds the result to the nearest whole number. 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. =C2-B2. Your formula got cut off, that sometimes happens when you use < signs, I assume you have a formula something like this. 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. 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. Then use the formula =A2-A1 to get the time difference. Formula: Please Login or Register to view. per hour. 3K subscribers Subscribe 16K views 6 years ago If. Time interval formula. A few are at or after midnight as in Column F. Duration Process :6 hours. I have a spreadsheet that tracks system outages. 🔗 Steps: Type the following formula on cell D5. Same as minutes we can also get the difference in seconds. Get Difference in Seconds. Time crossing midnight. You use the subtraction operator (-) to find the difference between times, and then do either of the. Over 7 minutes to 15 minutes = 1/4 hour 15. Duration Process :6 hours. The following formulas give ways to calculate the net Profit or Loss and how to display that information when using the Spreadsheet System for Trading. We can convert from one to the other. Inverse Proportionality of Speed & Time: Speed is said to be inversely proportional to time when the distance is fixed. To apply that formula, follow below given steps:-. 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. Here is the way the previous poster described it: "Excel template: Loan Amortization for random/irregular payments, figures days. 46 minutes to 60 minutes = one hour. Full 24 examples for 2 time. 000000. Date-time difference calculator usage. I attempted to add one to the end time if the bike ride ends on the next day, but this approach didn't. Start. Formula To Calculate Time Difference Crossing Midnight - Excel. Duration Process :6 hours. The problem is it goes haywire when you. Start Time (8:00am). Creates a Time from local, universal, and custom Time formats. Register. Consider that 10:00 pm to midnight is 2 hours, not 1 hour and 59 minutes. Start Time (8:00am). (See the time zone converter below and the error-trapping used in the calculation. LinkBack. Here's an example of how to calculate a time difference in Google Sheets: Start Time (A1): 8:00 AM. To start the conversation again, simply ask a new question. Re: formula to calculate time difference Thank Glen and Ali for your quick response . In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. Because the Earth spins, which makes the sky appear to rotate, the particular R. JUST USING TIME AND CROSSING MIDNIGHT. In the third cell I enter this formula, =INT ( (C163-B163)*24). Quang PT. Same as minutes we can also get the difference in seconds. b Mauritius and the Seychelles are to the east and north-east of Madagascar respectively. I want to calculate time difference in milliseconds from current time of a day(11 am , 1 october,2012) and time at midnight for the same day (11 pm 59 m 59s , 1 october , 2012. m. I have a start time and and an end time and would like to calculate the duration expended between the two. Hi I am looking for a way to subtract NOW() from a particular cell which has an example time of 17:23. 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. Example. However, I want to allow local managers to supply beginning and ending Times in their local time zone. . To get the correct calculated result between two times over midnight, you can apply the following formula: 1. ; Express the result as percentages by multiplying it by 100. Hi all Here is my current formula for calcualting time. This is the easiest way to calculate a time delta in Google Spreadsheets. Add the total hours to the total minutes (in hours and minutes): 6h + 1h 30m = 7 hours and 30 minutes, or 7:30 spent gardening. Spreadsheet Purpose: WORK HOURS per MTH with breaks & night time rate exta including Year Summary of Hours, Pay & Miles. In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. , numbers of seconds after midnight of. Where D5 is the ending time, and C5 is the starting time of duties of the employees. In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. I am a little confused with what you are after when you are stipulating. In Excel I have been trying to find an easier way to calculate a time difference where the times. to get 10 for a 10 minute difference and 71 for one hour 11 minutes you can use this formula [revised] =MOD (B1-A1,1)*1440. Press the keys Ctrl + 1 to open the Format Cells dialog box; Select the time format “ h:mm:ss ” Figure 4. 7°. If,. Start. It is important that the solution is Excel-based (no VBA or add-ins) and that the date changes respectively. Zulu time is another name for Coordinated Universal Time (UTC), which is the time at 0° longitude at the Greenwich Meridian. Here you can see the same difference, one formatted as automatic, which defaults to time, the other is formatted as a duration: The formula =B2-A2+(B2<A2) returns the difference between the two times, and adds 1 day if minuend is less than the subtrahend, it adds 0 days otherwise. Excel will interpret a TRUE` as 1 (a day) and add it. "Taking the formula in cell G4: The first part of the formula takes the finish time less the start time and then checks whether the finish time is less than the start time (E4<B4). I need to return the answer both in time (custom hh:mm) and also in decimals. If I calculate TAT for this time period it should show me 1 hour 33 minutes, why because business hours are closing by 5:00 PM on 10/29 so it should not calculate duration after 5:00 PM to until 08:00 AM on next day, however 10/29 is Friday so formula should calculate the duration from 10/29 Friday 3:37 PM to 10/29 5:00 PM and again it should. Grappenhall, Cheshire, UK. =INT (A1)+1 gives me 8/2/2019, but when walking through the formula, it's just 43678 not 43678. Remember that negative time values are displayed as #####. I have formatted A1 and A2 as "Time, 1:30 PM. In the next cell I enter the "end time", i. e. although if there is a possibility that your time period may cross midnight. 30 minutes to 45 minutes = 3/4 hour 45. They work on shifts and the operation is 24 hours. Use of MOD function ensures that will work even when the time gap passes midnight. 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. Click OK and Time format will be set. 6. we figure the bowler's average and subtract it from 200. "Day" hours can be calculated by 2300 minus time-in (if <2300), then "Night" hours are total hours minus "Day" hours. StartOfHour: Returns the start of the hour. 33% because we are calculating a difference between two numbers and not a change from one number to another, percentage change. Show Printable Version;. Enter this formula: =(B2-A2+(B2<A2))*24 ( A2 is the earlier time, B2 is the later time, you can. The last part of the sum is to multiple the result from that formula by the number of people I have on shift. Note: AM is used for times in the night and morning. and then update the difference every second. . Example:. If Function In Time Range - Excel. This works great and gives me the hours worked in a day until I enter a value after midnight for the end time. 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. There’s a specific formula to total hours worked past midnight in Exce. Here is the way the previous poster described it: "Excel template: Loan Amortization for random/irregular payments, figures days. In other words, you want the elapsed time or the difference between two times. See full list on exceldemy. However, I encountered a problem when a bike ride spans across midnight to the next day, as the formula produced a negative value. Example in SQL Fiddle. The fourth column is a simple subtraction formula taking column three from column two. 46 minutes to 60 minutes = one hour. Using the TEXT Function to Calculate Hours Between Two Times in Excel. , there are a total of 9 time zones used. e. Start. I need a formula to calculate Turn Around Time. 25) - Excel. e. In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. Formula To Calculate Time Difference Crossing Midnight - Excel. The apparent traveling time is the difference in local time between the departure city and the arrival city without taking into account the change of time zone. NOTE. between payment dates. 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. Screenshot. The time difference formula below always works. 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. You can then take divide that by 60 to get the hours that have passed, and take. Unit - the time unit to use when calculating the difference between two dates. Note: Date information in time_text is ignored. The next thing to do is to enter the time we want to subtract to or the subtrahend. To apply the custom time format, click Ctrl + 1 to open the Format Cells dialog, select Custom from the Category list and type the time codes in the Type box. Present the result in the standard time format. play with start and end. Duration Process :6 hours. 4:00 pm. Thus, the hour from midnight to 1 a. Start Date 2. Step 3. If you are not aware of it when (Start>Stop) evaluates as TRUE/FALSE applying the result to math operations coerces those into 1/0. As user3169 wrote, one can simply take the difference of time values (this works in Google Spreadsheets the same as in Excel). 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. 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. 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. Formulas: Results:. 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. Duration Process :6 hours. Over 7 minutes to 15 minutes = 1/4 hour 15. If applicable, differences to standard times as a result of DST also. 4:00 pm. A problem arises when I have people scheduled to work past midnight. To calculate total hours between start and end time, the formula in D5 is: = MOD (C5 - B5,1) This formula is explained in more detail here. Figure 2. 125-0. Lines of longitude are imaginary lines that travel north to south along the. Due to it being a negative, it comes up as 'error'. To solve for speed or rate use the formula for speed, s = d/t. Type in the comma and we’ll move on. In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. You cannot calculate in this manner to a date format field. = (Start>Stop)+Stop-Start. Keeping the format as h:mm means the result corrupts once it reaches 24:00. 5 hours. 6. Example:. And now, let's see how our time difference formula and time codes work in real worksheets. Please Login or Register to view this content. Received Date & Time: 10/29/2010 3:27:00 PM. 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? If you compare it to the true solar time (which determines when the Sun is in the meridian) as you try, you also have to account for the difference of the mean solar time and the true solar time due to the eccentricity of Earth's orbit; this phenomenon visible as the analemma (which basically visualizes the equation of time) accounts for a. =1440*MOD (B1-A1,1) If by "military time" you mean that your times don't have colons, e. 6. Example: Start time: 23:50:00 End time: 00:15:00 How would you formulate an equation to determine the duration of time or. 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. Estimating Elapsed Time in Excel Using the TODAY, NOW, NETWORKDAYS Functions. e. the formula will be in cell B1. ⏩ In cell E4, type the following formula. 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. Excellent, thanks very much, that worked perfectly. For example,. Orange line comes out through the data in column F from F30 onward. Often you may want to calculate the number of hours between two times after midnight in Excel. The Generic Formula to calculate the minutes between two times is: (END TIME - START TIME)*1440. 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? 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. Re: Calculating difference in time after midnight. that's crossing the meridian at a particular time is constantly changing. Start. The formula is, =D5-C5. Each gets 30 minutes for breaks which is not paid. This chapter documents the principles of basic traffic signal timing at an intersection. $egingroup$ 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. Ask Question Asked 3 years 11 months ago. The main function. You could say ΔF = 180. If you have cells with time in Excel, and you subtract one cell from another, you may end up with the pound symbols. Returns the number of days between two dates. To calculate hours worked, enter valid time values into B2 and C2. 875,1)*24 =MOD(-0. At sea level, water boils at 212 o F and freezes at 32 o F. For each 6 hours, use 1 minute for the acceleration of time: = 1 minute. Re: Calculating the total between two times that go over midnight. That is, the range has an inclusive start, and an exclusive end. 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. Thanks! Posted by Aladin Akyurek on July 18, 2001 9:53 AMIs there any formula to calculate Start time to End time with excluding lunch time? Here is example : Lunch time :12:00pm to 1:00pm. Richard Buttrey. Next, right-click the cell, choose “Format Cells,” and pick “General. If start and end times span midnight, you will need to adjust the formula as explained below. like System time :- 01:00:00 pm manual time :- 12:50:00 pm ans :- 00:10 when clock reach 01:00:00 pm then 00:11 when clock reach 01:01:00 pm then 00:12 when clock reach 01:02:00 pm and so on. 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. 1. It is essentially used to set the current time zone and then set a time using the spin buttons. 30 minutes to 45 minutes = 3/4 hour 45. 2. 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?The minute value does change. The rest of the work sheet is made up of time (hh:mm) and decimals so don't really want to change the format to AM /PM. Then, format the End time and Start time cells like this: h:mm am/pm. Percent Difference Equations Formulas Calculator from AJ Design Software, last visited 22, Feb. I have a loan with a variable beginning balance and irregular payments. A. By shirk in forum Excel General Replies: 1 Last Post: 04-06-2021, 10:20 AM. Formula To Calculate Time Difference Crossing Midnight - Excel. hours * 60 + departureTime. How do I calculate this time. 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. 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). 16 minutes to 30 minutes = 1/2 hour 30. Is there a formula that will automatically cross out a name if data is entered for that name on another sheet? In my attached workbook, I have a list of names on sheet 1 and sheet 2, once a value of any kind is entered for the name on Sheet 1 in column C I would like the matching name on sheet 2 to automatically be crossed off, is this possible?Use this calculator to add or subtract two or more time values in the form of an expression. Question/Issue: Need Formula to calculate number of night hours worked in a shift, using 4 values (Detailed below). keme May 13, 2021, 11:50am #4. All three arguments are required: Start_date - the initial date of the period you want to calculate. G1 cross midnight, which I know is the problem,. Converts a date in the form of text to a serial number. 6. Formula To Calculate Time Difference Crossing Midnight - Excel. Formula To Calculate Time Difference Crossing Midnight - Excel. In your selected cell, type the following formula and press Enter. Calculating Elapsed Time in Hours. The table formula refers to those cells. Add a comment. 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. In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. 5 hours. . The arrow ends at the hour circle of an orange dot indicating the apparent place of an astronomical object on the celestial sphere. 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. Formula To Calculate Time Difference Crossing Midnight - Excel. Calculate Total Hours Automatically Deducting Lunch Breaks - Excel. time-dep. Find the exact time difference with the Time Zone Converter – Time Difference Calculator which converts the time difference between places and time zones all over the world. See what time will it be in XX hours, or what time will it be in XX minutes. Here is the formula we will use: =INT( (A2 – B2) * 24) & " hours" //where A2 is EndDate and B2 is the StartDate. Get the time at any given coordinate on Earth, calculate time zone conversions. DAYS360. 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. But now I've got to calculate the part of the time someone worked between midnight and 06:00AM if that person indeed worked in those hours. At different times in the past, it has been calculated in different. Bij this code you can calculate the difference even over night. 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. Click a cell where you want to locate the calculated result, and then, click Kutools > Formula Helper > Formula Helper, see screenshot: 2. 1900) and then do the calculation and in case the timeto is smaller it will get to previous day, but convert to time will get the time part from it. So I am guessing I can't use this code to get this result. Get Difference in Seconds. Please see Creating a custom time format in Excel for the detailed steps. Formula. Looking at this example, you might wonder why C10 works, but C11 doesn’t. I need excel to perform something similar to what follows as my logic is the train is either early or late (as spot on time using either version of the. ;. In the example shown, the formula in D5 is: =IF(C5>B5,C5-B5,1-B5+C5) Often you may want to calculate the number of hours between two times after midnight in Excel. It respects the regional format of %TIME% without taking any assumptions on type of characters for time and decimal separators. Upon subtraction, we get a fraction. So I used TIME to add or subtract hours to give a GMT hour (in my columns I and J). But also 9 am to 4:30 pm also comes out as 7 hours instead of 7. can you update this code now I need to perform my task with system time and manual time. Therefore, dividing the (positive) difference of the SAS time values (i. DATEDIFF (date_part, date1, date2, [Start_of_week]) This calculation gives you more control over how date differences are computed in Tableau. 1. My problem is that the results half only been in full hours. 45 as the difference in midnight minus 8/1/2019 1:10 PM. If the start time of the work day is later than the end time of the work day, the formula nets zero. R. You have to account for crossing midnight. e. PM is used for times in the afternoon and evening. Dates and times are stored together (dates are day counts, stored as the integer portion of the value; times are fraction of a day, stored with the day count as a decimal fraction). If you land in California, you would list the time as it was in the Pacific time zone. Time. As such, you may want a column for "total hours" to make a few simple formulae for calculating (and makes checking a bit simpler). The result shows the current date and time, probably formatted like this: 6/26/2014 9:57. . Duration Process :6 hours. To calculate time difference, we convert both time values to seconds since midnight using the following formula: time m = hh*3600 + mm*60. Use the formula =abs (end time - start time). g. . In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. Formula To Calculate Time Difference Crossing Midnight - Excel. It's 18 hours later. The best way is to have both values as DateTime, then you can get the real value, as a workaround you can assume that if the end time is lower than the start time, means that it refers to next day, but it will be limited to 23 hours (24 if you use <=) DECLARE @start TIME = '21:00' DECLARE @end TIME = '01:00' SELECT DATEDIFF (HOUR. hours * 60 + arrivalTime. hours after midnight dont need a calculation as every day starts counting from 0 so 2 o'clock is also 2 hours after midnight only posible AM/PM notations needs to be omitted to show 1PM as 13:00 after midnight see attachment for result. I need to be able to work out the amount of worked time that fits into a certain time period. Conditional Formatting Using Hours/time - Excel. If the start date and time is later than the end date and time, the formula nets zero. . A. someone started at 01:00 end ended at 11:00. 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? In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. so 1 = 24hrs exactly. Computed Results are the Greenwich Sidereal Time at midnight GMT, the Hour Angle off the meridian at that time, as well as its Transit Time across the meridian. Duration Process :6 hours. The above formula will give you the total number of hours elapsed between the two-time values. The following formulas can help you to calculate worked time a day based on the time records. The bread bakes for a total of 50 minutes The oven needs to be pre-heated 1 hour prior to baking. Read on to find out more. In Excel I have been trying to find an easier way to calculate a time difference where the times cross midnight. Start. 45 as the difference in midnight minus 8/1/2019 1:10 PM. I want to calculate the Max, Min, and Ave times. To use the TIME function, simply enter the hour, minute, and second values as arguments in the function. 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. e. times don't go over midnight. . IsTimeOfDayBetween (someTime, new TimeSpan (5, 0, 0), new TimeSpan (21, 30, 0)) If startTime and endTime are DateTime s, you could say. I want to calculate the Max, Min, and Ave times. 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. If the start time is less than the. Re: Calculate time up to midnight.