VBS Object Required Error manipulating strings - windows

Question

I am trying to create a simple script that prompts the user for their birthday, formatted as 10.02.20, then takes that string and turns it into text, such as October 2nd 2020. I have the following code:
Dim bd, message, title ' define variables
title = "What is your birthday?" ' set variable
message = "Format like so: 12.15.07; 3.03.05" ' set variable
bd = InputBox(message, title) ' prompt user
Dim year
year = bd.Substring(6, 2)
Dim month
month = bd.Substring(0, 2)
Dim day
day = bd.Substring(3, 2)
msgbox bd ' for testing
call msgbox(year + month + day) 'also testing
And I am getting an error after the prompt, ...\Desktop\test.vbs(8, 1) Microsoft VBScript runtime error: Object required: '12.23.03' and I am not sure what it means, Object Required.
Any fixes or suggestions would be very much appreciated.

Answer 1

You cannot use Substring in VBScript. You can use Mid instead:
Dim year
year = Mid(bd, 7, 2)
The first character in a string is at position 1, not 0, so I adjusted your parameter from 6 to 7.
Also, to concatenate strings, although + works, you can also use &:
call msgbox(year & month & day)

Answer 2

You can use this function in vbscript : FormatDateTime(date,format)
Parameter Description
date Required.
Any valid date expression (like Date() or Now())
format Optional.
A value that specifies the date/time format to use can take the following values:
0 = vbGeneralDate - Default. Returns date: mm/dd/yyyy and time if specified: hh:mm:ss PM/AM.
1 = vbLongDate - Returns date: weekday, monthname, year
2 = vbShortDate - Returns date: mm/dd/yyyy
3 = vbLongTime - Returns time: hh:mm:ss PM/AM
4 = vbShortTime - Return time: hh:mm
Dim Title,Input
Title = "format date"
Input = InputBox("Enter your date of Birthday !",Title,"10.02.20")
Input = FormatDateTime(Replace(Input,".","/"),1)
MsgBox Input