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## About this lesson

Understand how dates work in Excel using the TODAY, YEAR, MONTH, DAY, and DATE functions.

## Exercise files

Download this lesson’s related exercise files.

Understanding Dates23 KB Understanding Dates - Completed

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## Quick reference

### Understanding Dates

Understanding how dates work in Excel using the TODAY, YEAR, MONTH, DAY, and DATE functions.

### When to use

In order to reduce error potential, we need to try and enter data as few times as possible. Using Excel’s Date functions, we can manipulate a date in a single cell into every format of the date that we could possibly need.

### Instructions

#### Key Understandings

- Dates are just a number mask put on a numerical value
- Each date’s “serial number” (underlying value) is the number of days since Jan 1, 1900
- Because dates are values, we can add and subtract days from them

#### Formula Examples

=TODAY() |
Will return the current date, updating each time Excel recalculates. |

=YEAR(A1) |
Will extract the 4-digit year from the value in cell A1. |

=MONTH(A1) |
Will extract the 1-2 digit month from the value in cell A1. |

=DAY(A1) |
Will extract the 1-2 digit day from the value in cell A1. |

=DATE(2013,12,25) |
Will convert the value into the numerical value representing 2013-12-25. |

=TODAY()+1 |
Will return tomorrow’s date, updating each time Excel recalculates. |

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