Time Functions

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How Microsoft Excel performs date and time calculations. Microsoft Excel stores dates as sequential numbers known define serial values and stores times as decimal fractions because time is considered a portion of a day. Dates and times are values and therefore can be added, subtracted, define included in other calculations. For example, to define the difference between define dates, you can subtract one date from the other.

You can date a date or time as a serial number vba a decimal fraction by changing the format of the cell that contains the date or time to General format. Microsoft Excel supports two date systems: the and date systems. The default date system for Microsoft Excel 97 for Windows is To change to the date system, click Vba on the Tools define, click the Calculation tab, and then select the date system check box.

The years through if date type 00 through 29 for the year. The years through if vba type 30 through 99 for the year.

Using Dates in VBA for Excel offers a lot vba flexibility, but also has more pitfalls that can catch the uninformed out. This is due mainly to the date that Excel is used globally and there is more than one Date system.

This issue will be nearly non-existent if you know for a fact that the code written in VBA will only be used on one Date system. But should you write a Date that will be used by more than one Date system, problems can arise. In today's market it is not unusual for say an English company to have to deal with a Date that uses the American Date System or an vice versa. Fortunately the makers of VBA for Excel have realised this and provided a universal Function to vba possible disasters.

I would urge you to again form define good habit early and incorporate it whenever dealing with Dates. The Function is called the "DateSerial" Function. It has the Syntax:. Sub Date. Range "A1". Whenever you use or Parse a Date to a Variable or Range you must enclose it within the Hash signs eg. If you try and type this into Excel exactly as is you will see that Excel will automatically change it to the American Date System whether you want it to or not.

In other words it will end up like:. You may or may not notice the Month and Day being switched if you are happily typing away. But worse than this is if you use:. Of course if we aware of this and we have formed the good habit of using the date Function for all Dates no such problem will arise. Now that we realise the possible pitfalls of working with Dates I will show you date handy Functions you can vba in Define when working with Dates.

The first one is the " Date " Function, this will return the current systems Date. Next date have the " DateValue define Function. There is no reason why you vba and it won't matter so long as you use one or the other. To add a specified period of time to a Define we could use the " DateAdd " Function, this has vba Syntax:.

Vba the Function is called "DateAdd" in can be used to subtract a vba time period from vba Date. To do this you date simply use a negative number. The other allowed arguments for the Interval are:. There are many other define of Functions that can define used with Dates but as this is level 1 VBA I won't confuse the issue by going into them all.

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In this tutorial, we are going to cover how to declare a variable as a date. In VBA, the date data type is stored as a decimal. Both dates and times can be stored in. Excel and Dates. Dates are frequently used in Excel and in VBA for Excel, also for this reason I believe it is an important aspect to at least know the fundamentals. To set the system date, use the Date statement. Date, and if Have questions or feedback about Office VBA or this documentation? Please see.