![]() If months is zero (0), EOMONTH() provides the last date of the start_date month. The months input is any integer number, positive or negative. The start_date is the reference date in Excel date format. This function provides the date value for the last day of any month, relative to the date provided (The End Of the MONTH). The syntax for the EOMONTH() function is as follows: EOMONTH( start_date, months) This formula uses the EOMONTH() function. In the row with the first line of data, type the following formula and press ENTER: In the column next to your weekly data (in our case Column C), create new header and call it “ Days In Month” or something similar (the title is just for reference). To do this clearly, we are going to create a helper column that helps us calculate the conversion. Most weeks will be fully in the current month, so that month will get all of the days. To allocate the correct number of days to each month, we need to build a formula that counts how many days in the week were in the prior month and how many were in the current month. ![]() You could make a different assumption, but it would make the formulas more complicated. In this tutorial, we’ll assume that each day is average – 1/7th of the week’s total. Since we have only summarized data about each week, there is no way to know exactly what each day’s data was, so you will need to make some assumptions about the daily data. It is still possible to convert week beginning dates and data, but the formulas will need to be changed. Throughout this tutorial, we are going to assume that the date provided in your weekly data is the week end. In Column B we have total sales that occurred in that week. In Column A, we have a date field listing the ending date of each week (Saturday). Here we have some pretty standard weekly aggregated sales data. Let’s dive in!įirst off, let’s take a look at our sample data… This tutorial will teach you how to convert weekly summary data into monthly total data by allocating the days in each week to the appropriate month of the year. This article is part of a series that will help you work with date-based data in Excel to get it into the formats you need. Date-based data is especially challenging – there are days of the week, weekly totals, months with different numbers of days, and holidays that land on different weekdays each year. 5Building the Monthly Total Formula, Part 2ĭata comes to us in many forms, and often our biggest challenge is translating it from the form it came in into the form we need it in.4Building the Monthly Total Formula, Part 1.
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