How to sum overlapping time
The worksheet above shows four different time ranges in column B and C, the formula in cell C10 counts the […]

Count overlapping days across multiple date ranges
This post demonstrates a formula in cell D16 that counts overlapping dates across multiple date ranges. The date ranges are […]

Sum numerical ranges between two numbers
This article explains how to build an array formula that sums numerical ranges. Example, I want to know how to […]

Count overlapping days in multiple date ranges, part 2
In the previous post I explained how to count overlapping dates comparing a single date range against multiple date ranges. […]

Count overlapping days in multiple date ranges
The MEDIAN function lets you count overlapping dates between two date ranges. If you have more than two date ranges […]

Find empty dates in a set of date ranges
The formula in cell B8, shown above, extracts dates not included in the specified date ranges, in other words, dates […]

Working with overlapping date ranges
This article demonstrates formulas that calculate the number of overlapping ranges for all ranges, finds the most overlapped range and […]

How to calculate overlapping time ranges
I found an old post that I think is interesting to write about today. Think of two overlapping ranges, it […]

Identify rows of overlapping records
This article demonstrates a formula that points out row numbers of records that overlap the current record based on a […]

Find earliest and latest overlapping dates in a set of date ranges based on a condition
This article explains how to create a formula that returns the earliest (smallest) and the latest (largest) date of overlapping […]

Highlight date ranges overlapping selected record [VBA]
This article demonstrates event code combined with Conditional Formatting that highlights overlapping date ranges based on the selected date range. […]

Units contained in a range that overlap another range
This article demonstrates how to calculate overlapping numerical ranges. What is interesting to know is the fact that Excel handles […]

Prevent overlapping date and time ranges using data validation
The picture above shows an Excel Table with Data Validation applied. An error dialog box appears if a user tries […]

Filter overlapping date ranges
This blog article describes how to extract coinciding date ranges using array formulas, the image above shows random date ranges […]

List dates outside specified date ranges
This article demonstrates how to calculate dates in a given date range (cells B13 and B14) that don't overlap the […]

Identify overlapping date ranges
This article demonstrates formulas that show if a date range is overlapping another date range.  The second section shows how […]