## Excel 365

### How to calculate age in Excel

To calculate the age of a person, a pet, a project, or even some device, you need to compute a
number of complete years. The issue is that it doesn't seem enough to calculate a year's difference.
Excel proposes a very useful formula that can help you to calculate that very fast.

### How to calculate a lifetime in Excel

Sometimes it is necessary to calculate a lifetime for some devices, things. Usually, a lifetime
calculates in full months, for example, to check a warranty or guaranty period. Excel proposes
a very useful formula that can help calculate that time.

### How to calculate how many days left to or passed from the specific date in Excel

For some projects or tasks, you might need to calculate how many days, months, or years left to
some date or how many days, months, or years passed from some date till today. Excel proposes a very
useful formula that can help you to calculate that very fast.

### How many work weeks left to or passed from the specific date in Excel

When you plan a project, you can need to calculate a number of workdays or full workweeks
between the start and end dates, or how many workdays or workweeks left/passed. This tip is about an
easy and fast way of calculation of full workweeks for weeks from Monday to Sunday.

### How many weeks left to or passed from the specific date in Excel

When you plan a trip, project, etc. you can need to calculate a number of days or weeks between the
start and end dates, or how many days or weeks left/passed. This tip is about an easy and fast way
of complete weeks calculation.

### How to copy computed subtotals in Excel

When you compute subtotals in your spreadsheet, it can be necessary to select only subtotals and
copy them to another sheet for future processing. If you select subtotals and copy them using
copy-paste (

**Ctrl+C**and**Ctrl+V**), Excel pastes all source data with subtotals. This tip demonstrates the workaround that allows you to copy just rows with subtotals.### How to create an equilateral triangle, a regular square, and other regular polygons in Excel

For some charts or diagrams, you need to create a regular polygon –

**equiangular**(all angles are equal) or**equilateral**(all sides have the same length). E.g.,**, regular***equilateral triangle***, etc.***square*### Change the default font and style for shapes in Excel

When you create a shape in your spreadsheet, it is created with the default style and any text that
you type has the default font.

### Conditional formatting for weekends

When you create a data table with daily records, you can need to highlight weekends or other
specific days. You don’t need to open a Calendar and do it manually; Excel proposes conditional
formatting that can help you do it without any calculation.

### How to calculate the number of work days for a four-day workweek

When calculating the difference between two dates, you may want to exclude weekends and holidays.
Excel proposes a standard formula for
calculating the number
of workdays for standard, five-day workweek.
Also, Excel proposes a formula for
calculating
the number of workdays for different five-day workweek or six-day workweek.