Excel 2010/2013
Excel 2007
Excel 2003
Tips & Tricks
Excel Forum
Course Index CIG Excel Book
 
Home   News   Tips   Glossary   Templates   Forums   Help   Logon   Order   Contact Us  
 
Tips & Tricks

New Tips Added Weekly!
Click here to get on our Mailing List

   

  Access   Excel   Word   Windows   FrontPage   Hardware   Misc

 

Adding Dates & Times in Excel
 
Q: I'm using Microsoft Excel 2003. How can I take a date, say 12/10/2007, and add 2 months to it?
 
A: The simple way to add dates and times is to simply add values of 1 for each day. For example, if you have 1/1/2008 in cell A1, then you could say =A1+60 in cell B1 to add roughly two months to that date. This is good enough for most cases, and it works fine for weeks (adding 7 days).

You can do the same thing with times if you realize that an hour is 1/24th of a day. If you want to add 6 hours to a time (1/4 of a day) then you could say =A1+(1/4). If you want to add 5 hours, just say =A1+(5/24).

Now you just have to format the cell as a TIME and you get the right answer.

Now like I said, this is usually good enough for most cases. But what about when you really need to be exact? Well, you can use Excel's DATE and TIME functions for more exact date arithmetic. For example. Let's say you need to add 2 months again. This time, however, the start date is 3/1/08. Adding 60 gives you the wrong date.

So now we need something a little more advanced. Try using the DATE function: =DATE(YEAR(A1), MONTH(A1)+2, DAY(A1))

That adds exactly 2 months to the date in A1. You can do the same trick to add years or days. For example, this will add 5 years, 6 months, and 10 days to the date in A1: =DATE(YEAR(A1)+5, MONTH(A1)+6, DAY(A1))+10

Now adding TIME works just a little bit differently. If you want to add 6 hours to a cell use the TIME function like this: =A1+TIME(6,0,0)

Yes, the value comes up with a strange 1/0/1900 20:00 at first, but if you just format the cell as a TIME value, it's correct. The TIME function basically is =TIME(hours, minutes, seconds). So if you want to add 2 hours, 15 minutes, 10 seconds, you would say: =A1+TIME(2,15,10).

I cover dates and time in much more detail in my Excel 232 tutorial. I'll also show you how to calculate the difference between two dates or times, and teach you more about how dates and times are stored internally inside Excel.

 

By Richard Rost   Richard Rost on Facebook Richard Rost on Twitter Richard Rost on Google Plus Richard Rost on LinkedIn Email Richard Rost
Click here to sign up for more FREE tips

 

You may want to read these articles from the 599CD News:

 

Learn
 
Accessindex
Excelindex
Wordindex
Windowsindex
PowerPointindex
Photoshopindex
Visual Basicindex
ASPindex
Seminars
More...
Customers
 
Account Login
Online Theater
Downloads
Lost Password
Free Upgrades
Insider Circle
Student Databases
Info
 
Latest News
New Releases
User Forums
Topic Glossary
Tips & Tricks
Articles
Search Our Site
Waiting List
Production Schedule
Collapse Menus
Help
 
Live Chat
Customer Support
WalkThru Tutorials
Troubleshooting
FAQs
TechHelp
Consulting Services
About Us
 
Background
Testimonials
Jobs
Affiliate Program
Richard Rost
Free Lessons
Mailing List
Order
 
Video Tutorials
Handbooks
MYOLP Memberships
Idiot's Guide to Excel
Volume Discounts
Payment Info
Shipping
Terms of Sale
Gift CDs
Contact
 
Live Chat
General Info
Support Policy
Contact Form
Email Us
Mailing Address
Phone Number
Fax Number
Course Survey
Facebook    Twitter

Google Plus    LinkedIn

Blog RSS Feed    YouTube Channel
Richard Rost Microsoft MVP