Raddatepicker not validating
The Date Time Picker control allows selecting a date and time by editing the displayed values in the control.If you click the arrow in the Date Time Picker control, it displays a month calendar, like a combo box control.
For the time check, the array returned includes the hour (pos 1), minutes (pos 2) and, optionally, the am/pm string (pos 3).
Each of these values is then tested against an allowed range (days: 1 - 31; months: 1 - 12; years: 1902 - 2017; and so on).
The form in design view: Add the following code in the code editor window: Public Class Form1 Private Sub Form1_Load(sender As Object, e As Event Args) Handles My Base.
When capturing information for insertion into a database, or use in other processing, it's important to control what the user can enter.
This script only confirms that the input format is correct and that each individual value falls within its allowed range.
It does not check for leap years or invalid dates at the end of short months.
The expressions use a pre-defined class is returned which enables the form to be submitted.
This routine DOES NOT check that the date or time input values are valid, just that they match the required format (d/m/y and h:m). Once you're in control of the input format, it's a lot easier to check that the values are actually valid.
In this simple example we can even rewrite the In practice most modern browsers will now use HTML form validation to preempt any Java Script validation - with the notable exception of Safari. Visitors from some countries may find it confusing that we're using the and vice-versa as the year and day values have now changed position.
In Java Script to check for different month lengths, particularly for February in leap years, you need quite a bit of extra code.
I'm not going to show that here, but you can find a link to get started under References below.