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Access Expert Level 28

Expert Microsoft Access Tutorial - 2 Hours, 18 Minutes
Access Expert 28 is Part 4 of our Comprehensive Guide to Access Functions. Today's class is part 2 of our focus on Date/Time Functions. You will learn about many new functions including WeekDay, DateAdd, DateDiff, DateSerial, DatePart, and more. Topics include:
access cd   - Date/Time Functions Part 2
  - Break Apart Dates with Day, Month, Year
  - Calculate Day of the Week with WeekDay

  - DateAdd - What's 2 months from today?
  - DateDiff - How long until loan paid?
  - DatePart - Is order from last quarter?
DateSerial - Find last day of next month
  - Display Ordinals: 1st, 2nd, 3rd, etc.
  - Calculate someone's exact age
  - List of birthdays for next month

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If you would like a preview of what's covered in this class,
click here to watch the first and last lessons of this course (free of charge), or scroll down for more information.


Access Expert Level 28
Description: Access Expert Level 28
Versions: This class was recorded with Microsoft Access 2013. The material is valid for Access 2007 up to 2021. Access has not changed that much over the years.
Pre-Requisites: Access Expert Level 27 strongly recommended, as you should watch all of my classes in order. However, if you're skipping around, you should have at least completed the Beginner series and the first 3 or 4 levels of the Expert series where I start to cover functions. You should DEFINITELY watch Expert 27, as that's part 1 of the Date/Time functions and explains the fundamentals.
Running Time: 2 Hours, 18 Minutes
Cost: $29.99

This is part 2 of the DateTime functions, and part 4 of the Comprehensive Guide to Access Functions. We will be learning many new functions in today's class. We will start by using these simple date/time functions to break apart a date value into it's components:

- Day()
- Month()
- Year()
- Hour()
- Minute()
- Second()

We can use these functions to answer questions like is this date in the current year? Previous year? Current month? Year to date? We will use the WeekDay() function to determine what day of the week a particular date falls on (Sunday thru Saturday). We can then determine if this is a work day (M-F) or a weekend day (S,S).

weekday function


Next we will learn about the DateAdd() function which we can use to add any interval to a date range. The interval can be days, weeks, months, years, quarters, etc. This is handy for working with whole calendar months or years. You can say "add 3 months to this date" and get the correct answer; much better than just adding 30 days for a month. You can also subtract dates, such as "what date was exactly 7 year ago?" or "what date is 9 months from now?" In this example, we are adding 10 years to the value in field D:

DateAdd Function


We will learn about the DateDiff() function which is used for finding the difference between two days, again in any interval you want. How many years are between two dates? How many weeks? How many whole months? How many weeks have there been since Jan 1st of the current year? We'll also learn about the optional First Day Of Week and First Week of Year parameters.

DateDiff Function


The DatePart() function is like the functions we learned earlier for taking a date apart into it's various components, but it has a lot more flexibility. We can use DatePart for answering questions like "is a date in a specific month?" or "is this date in the previous quarter?" I'll show you a couple of formulas listed on Microsoft's site that may not give you correct values when dealing with weeks and the DatePart function, and my replacements for those.

DatePart Function


The DateSerial() function is one of the most useful functions in Access. You can use it to construct a date from its various components. You can use DateSerial to find the first day of the month, the first day of next month, the last day of the previous quarter, how many days are in this year, and lots more. We'll learn how to calculate someone's EXACT age (to the second). This is great for birthdays, anniversaries, and knowing whether or not someone should be drinking in your bar. :)

DateSerial Function


You will learn how to display Ordinal Dates, so if you want to say "Today is Monday, February 2nd" you can. You'll learn how to use nested IIF functions to determine how to write 1st, 2nd, 3rd, 4th, etc.

Ordinal Dates


Finally, you will learn how to generate a list of all of the birthdays (or anniversaries) coming up next month, so you can print out birthday cards in January for all of the February birthdays. We'll also talk about Table-Level Validation Rules, so you can make sure all of your order ship dates are later than the order dates.

List of birthdays


New with this class, all of the functions and other code used in the class will be included in a "Code Sample" form inside the database you can download from my site at no extra charge:

code sample form


This is the 28th class in the Access Expert series. This is the fourth class in my Comprehensive Function Guide series, and part 2 of 2 classes on Date/Time Functions. If you're serious about building quality databases with Access, don't miss out on this course. Of course, if you have any questions about whether or not this class is for you, please contact me.


Complete Outline - Access Expert Level 28

00. Intro (8:30)

01. Break Apart Dates (21:59)
Day(), Month(), Year()
Hour(), Minute(), Second()
Is date in current year
Format property display
Is date in previous year
Is date in next year
Is date in current month
Is date in current year to date
WeekDay() Function
WeekDayName() Function
MonthName() Function
What Day of the Week is Today?
First Day of Week
Last Day of Week
Tuesday Following Date
Weeks that Start on a Different Day
What's Weekday if week starts on Monday?
What's Monday before today?
Is Date a Work Day (Mon-Fri)
Is Date a Weekend Day (Sat, Sun)

02. DateAdd Function (9:32)
Query Insert Columns
DateAdd() Function
One day from Date
DateAdd Format Codes
One week from Date
One month from Date
One year from Date
How DateAdd handles leap years
One week before Date
Exactly 9 months from Date
Exactly 21 years before Date
1.5 years from Date
Within one calendar month from Date
Less than one calendar month before
Ten Minutes from Date

03. DateDiff Function (15:32)
Difference Between Two Dates
DateDiff() Function
Number of days between two dates
Number of days since order placed
Months until mortgage is paid
Someone's age (not 100% reliable)
Number of weeks since Jan 1st
Number of minutes worked
First Day of Week Optional Parameter
First Week of Year Optional Parameter
04. DatePart Function (16:52)
Working with individual date components
DatePart() Function
Show orders from this year
Similar as Day, Month, Year
Date in a specific month
Date in a specific quarter
Date in current week of year
Invalid formulas on Microsoft's site
Date in previous week
Date in next week
Be careful of suspicious behavior
Use optional parameters for DatePart
Date in previous month
Date in next month
Date in current quarter
Date in previous quarter
Date in next quarter

05. DateSerial Function (17:03)
First Day of Month
Last Day of Month
First Day of Previous Month
Last Day of Previous Month
First Day of Following Month
Last Day of Following Month
First Day of Quarter
Last Day of Quarter
First Day of Year
Last Day of Year
How Many Days in Month
How Many Days in Quarter
How Many Days in Year
What Day of the Year is it?
How Many Days Remaining in Year?
Exact Age / Anniversary Calculations
TimeSerial() like DateSerial
DateValue() Function
TimeValue() Function
CDate() Function - BOTH date AND time
Useful to convert strings to DateTime

06. Ordinal Dates (08:40)
Displaying 1st, 2nd, 3rd, 4th, etc.
Discuss VBA Function for Ordinals
Learn how to calculate with IIF Functions

07. Miscellaneous (33:02)
Calculate Someone's Next Birthday Date
List of Birthdays in Next 60 Days
How many days until your next birthday
List of Birthdays from Next Month
Use the NZ function
Not all customers have CustomerSince
If NULL, assume start date of business
Field Level Validation Rules
Table Level Validation Rules
Validation Rule ShipDate > OrderDate
Validation Rule OrderDate <= Now()

08. Review (6:36))


Keywords: Comprehensive Function Guide, Date Time Functions Part 2, microsoft access tutorial, microsoft access tutorial, microsoft access training, access 2007, access 2010, access 2013, Day, Month, Year, Hour, Minute, Second, WeekDay, WeekDayName, MonthName, DateAdd, DateDiff, DateSerial, DatePart, DateValue, TimeValue, CDate


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