Excel Power Pivot & Power Query For Dummies, 2nd Edition
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The following table contains Excel date functions that help do things like add months, pull out date parts, and get the number of days within a given time period.
Function What It Does and How to Use It
Date.AddDays Increments a given date value by a specified number of days. This example returns a date that is seven days from the date in Column1: Date.AddDays([Column1], 7)
Date.AddMonths Increments a given date value by a specified number of months. This example returns a date that is three months earlier than the date in DateColumn1: Date.AddMonths([DateColumn1], -3)
Date.AddWeeks Increments a given date value by a specified number of weeks. This example returns a date that is 12 weeks from the date in DateColumn1: Date.AddWeeks([Column1], 12)
Date.AddYears Increments a given date value by a specified number of years. This example returns a date that is one year earlier than the date in DateColumn1: Date.AddYears([DateColumn1], -1)
Date.Day Returns the day number for a given date value: Date.Day([DateColumn1])
Date.DayOfWeek Returns a number between 0 and 6 representing the day of the week from a date value: Date.DayOfWeek([DateColumn1])
Date.DayOfYear Returns a number that represents the day of the year from a date value: Date.DayOfYear([DateColumn1])
Date.DaysInMonth Returns the number of days in the month from a date value: Date.DaysInMonth([DateColumn1])
Date.Month Returns the month number from a DateTime value: Date.Month([DateColumn1])
Date.WeekOfMonth Returns a number for the count of week in the current month: Date.WeekOfMonth([DateColumn1])
Date.WeekOfYear Returns a number for the count of week in the current year: Date.WeekOfYear([DateColumn1])
Date.ToText Returns the text representation of a given date. The following example returns the 3-character month name for the date in DateColumn1: Date.ToText([DateColumn1],"MMM") The following example returns the full month name for the date in DateColumn1: Date.ToText([DateColumn1],"MMMM")

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Michael Alexander is a Microsoft certified application developer and author of several books on advanced business analysis with Microsoft Access and Microsoft Excel. He has been named a Microsoft MVP for his ongoing contributions to the Excel community.

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