Access vba date variable

The key to learning VBA is the same as if you were learning a foreign language. You must learn the basics first. VBA, like any language, has its own syntax and components that you must combine in just the right way for Access to understand your message and respond.

Until you learn these rules, you'll find it difficult, if not impossible, to speak to Access. VBA uses variables and constants to represent a value. Technically, a variable is a small portion of memory that stores a piece of information, but people tend to think of them as names that represent data. Constants are similar to variables in that they store a value.

What the two have in common is that both represent values or objects. The main difference between the two is that a constant represents a value that doesn't change, whereas variables can be updated at any time.

Variables are a representation of a value or an object. You assign a descriptive name using your naming convention, declare a data type for the variable and then use it, reuse it, and even change it.

If you omit datatypeVBA defaults to a Variant. It's best to always explicitly declare a variable's data type. Variant variables require slightly more memory and are slightly slower than other types of variables.

On the other hand, they don't limit the type of data you store. But you are unlikely to have the requirement to store many types of data in a single variable, which is the only good use for a variant. The New keyword is optional and can only be used when declaring an object variable.

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To learn more about this issue, read Chapter 8, "Understanding Objects. Generally, Dim statements appear at the beginning of a procedure.

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This arrangement isn't required, but you'll find most developers adhere to this guideline. By grouping them at the beginning, you can find them much quicker. You can declare a number of variables in a single line by separating them with commas, as follows:.

Declared variables are supported by IntelliSense. By default, VBA lets you enter undeclared variables in your code.

To illustrate, open a standard blank module and enter the following code:.Keep in touch and stay productive with Teams and Officeeven when you're working remotely. Returns a Variant Date. DateValue date. The required date argument is normally a string expression representing a date from January 1, through December 31, However, date can also be any expression that can represent a date, a time, or both a date and time, in that range.

If date is a string that includes only numbers separated by valid date separators, DateValue recognizes the order for month, day, and year according to the Short Date format you specified for your system. DateValue also recognizes unambiguous dates that contain month names, either in long or abbreviated form.

If the year part of date is omitted, DateValue uses the current year from your computer's system date.

Declaring variables

If the date argument includes time information, DateValue doesn't return it. However, if date includes invalid time information such as ""an error occurs. If the calendar is Hijri, the supplied date must be Hijri.

access vba date variable

Returns the date values of the field "DateTime" in the Short date format without the time information. For more information about working with VBA, select Developer Reference in the drop-down list next to Search and enter one or more terms in the search box. This example uses the DateValue function to convert a string to a date. Choose the right date function. Learn more. Date and time functions. Expand your Office skills. Get new features first. Was this information helpful? Yes No.

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Contact Support.Sign in to post your reply or Sign up for a free account. By using this site, you agree to our updated Privacy Policy and our Terms of Use. Manage your Cookies Settings. Join Now login. Ask Question. Thanks, in advance. Jul 23 ' Post Reply. Share this Question. Are you executing this sql through code?

Or is it simply a query?

access vba date variable

Either way could you post the full SQL for the problem. Here is the code. It is in the "Clicked" event of a command button. Anyone have any ideas? I think I need to get quotes around the variable names? Been trying can seem to get it.

Jul 24 ' Thats closer Mike, at least the " " get stuck around the dates. The syntax looks good any other ideas why still the error.

access vba date variable

You're missing the from clause. Expand Select Wrap Line Numbers. Thanks guys! Date comparison does not work correctly??When declaring variablesyou usually use a Dim statement. A declaration statement can be placed within a procedure to create a procedure-level variable. Or it may be placed at the top of a modulein the Declarations section, to create a module-level variable.

The following example creates the variable and specifies the String data type. If this statement appears within a procedure, the variable strName can be used only in that procedure. If the statement appears in the Declarations section of the module, the variable strName is available to all procedures within the module, but not to procedures in other modules in the project. To make this variable available to all procedures in the project, precede it with the Public statement, as in the following example:.

For information about naming your variables, see Visual Basic naming rules. If you do not specify a data type, the Variant data type is assigned by default. You can also create a user-defined type by using the Type statement. You can declare several variables in one statement.

To specify a data type, you must include the data type for each variable. In the following statement, the variables intXintYand intZ are declared as type Integer. In the following statement, intX and intY are declared as type Variantand only intZ is declared as type Integer. You don't have to supply the variable's data type in the declaration statement.

If you omit the data type, the variable will be of type Variant.

VBA Variables – declaring using VBA Dim and VBA Data Types

Public variables can be used in any procedures in the project. If a public variable is declared in a standard module or a class moduleit can also be used in any projects that reference the project where the public variable is declared. You can use the Private statement to declare private module-level variables. When used at the module level, the Dim statement is equivalent to the Private statement.

You might want to use the Private statement to make your code easier to read and interpret. When you use the Static statement instead of a Dim statement to declare a variable in a procedure, the declared variable will retain its value between calls to that procedure.

You can implicitly declare a variable in Visual Basic simply by using it in an assignment statement. All variables that are implicitly declared are of type Variant.

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Variables of type Variant require more memory resources than most other variables. Your application will be more efficient if you declare variables explicitly and with a specific data type. Explicitly declaring all variables reduces the incidence of naming-conflict errors and spelling mistakes. If you don't want Visual Basic to make implicit declarations, you can place the Option Explicit statement in a module before any procedures.In this tutorial we will learn about VBA Variables.

We will continue with diving into more advanced topics. So what is a variable? Is it basically a symbolic name for a storage location, for storing data or pointers to data. Without variables you would be able to process any data. When using variables there are 2 steps you need to complete:. This means that this is equally valid:. Declaring multiple variables You can also use the Dim statement to declare multiple variables in one line using the VBA Dim statement.

Below the list of data types available in VBA. For a more detailed list see here MSDN. I personally prefer explicit variable declaration as you will learn this will help reduce any errors resulting from mistyping variables names.

Let me give you an example:. As you can see above, I have defined a variable named myVar with value In the second line I defined a new variable res with the value of myVa — mistyping the name of my myVar variable.

Now as myVa is a new variable without a defined value, VBA will assign a default null value to this new variable equal to 0. To prevent such errors use the Option Explicit statement in the first line of you Module as show below:.

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In VBA you can also declare constants — values that can be defined only once and cannot be modified will throw an exception. This is an example of a constant declaration:. A variable that is not accessible only within the scope in which it was declared. Below are some examples of Private variables. A variable that is accessible within ALL scopes in contrast to Private variables. Below are some examples of Public variables.

Global variables are basically equivalent to Public variables. Global variables are most likely kept for backwards compatibility older versions of Excel so I recommend you stick to using only Public variables.

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13/28 - DateDiff Function - MS Access VBA Intermediate Tutorials

Dim myVar As Integer. Interesting fact — you you can declare and define a variable in one line using the colon symbol :.Holds IEEE bit 8-byte values that represent dates ranging from January 1 of the year through December 31 of the yearand times from AM midnight through Each increment represents nanoseconds of elapsed time since the beginning of January 1 of the year 1 in the Gregorian calendar.

The maximum value represents nanoseconds before the beginning of January 1 of the year Use the Date data type to contain date values, time values, or date and time values. You can get the current date and time from the DateAndTime class. You must enclose a Date literal within number signs. You can use slashes when specifying the year first. This requirement is independent of your locale and your computer's date and time format settings.

The reason for this restriction is that the meaning of your code should never change depending on the locale in which your application is running. To convert a Date literal to the format of your locale, or to a custom format, supply the literal to the Format function, specifying either a predefined or user-defined date format.

The following example demonstrates this. Alternatively, you can use one of the overloaded constructors of the DateTime structure to assemble a date and time value. The following example creates a value to represent May 31, at in the afternoon. You can specify the time value in either hour or hour format, for example PM or However, if you do not specify either the minutes or the seconds, you must specify AM or PM.

If you convert a Date value to the String type, Visual Basic renders the date according to the short date format specified by the run-time locale, and it renders the time according to the time format either hour or hour specified by the run-time locale.

Interop Considerations. If you are interfacing with components not written for the. Type Characters. Date has no literal type character or identifier type character.

However, the compiler treats literals enclosed within number signs as Date.Keep in touch and stay productive with Teams and Officeeven when you're working remotely. Each function coerces an expression to a specific data type. CBool expression. CByte expression. CCur expression. CDate expression. CDbl expression.

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CDec expression. CInt expression. CLng expression. CSng expression. CStr expression. CVar expression. The required expression argument is any string expression or numeric expression. Return Types. The function name determines the return type as shown in the following:. Range for expression argument. The smallest possible non-zero number is 0. Same range as Double for numerics. Same range as String for non-numerics. If the expression passed to the function is outside the range of the data type being converted to, an error occurs.

In general, you can document your code using the data-type conversion functions to show that the result of some operation should be expressed as a particular data type rather than the default data type.

DateValue Function

For example, use CCur to force currency arithmetic in cases where single-precision, double-precision, or integer arithmetic normally would occur. You should use the data-type conversion functions instead of Val to provide internationally aware conversions from one data type to another. For example, when you use CCurdifferent decimal separators, different thousand separators, and various currency options are properly recognized depending on the locale setting of your computer.

When the fractional part is exactly 0. For example, 0. CInt and CLng differ from the Fix and Int functions, which truncate, rather than round, the fractional part of a number. Also, Fix and Int always return a value of the same type as is passed in. Use the IsDate function to determine if date can be converted to a date or time.

access vba date variable

CDate recognizes date literals and time literals as well as some numbers that fall within the range of acceptable dates. When converting a number to a date, the whole number portion is converted to a date. Any fractional part of the number is converted to a time of day, starting at midnight. CDate recognizes date formats according to the locale setting of your system. The correct order of day, month, and year may not be determined if it is provided in a format other than one of the recognized date settings.

In addition, a long date format is not recognized if it also contains the day-of-the-week string. Since there is now an intrinsic Date type, there is no further need for CVDate.