Below you'll find the source for the Visual Basic 6 function zerofill.
Attribute VB_Name = "modZerofill"
' This function is downloaded from:
' http://www.stefanthoolen.nl/archive/vb6-functions/
'
' You may freely distribute this file but please leave all comments, including this one, in it.
'
' @Author Stefan Thoolen <mail@stefanthoolen.nl>
Option Explicit
''
' Completes a string by adding zero characters to the front
' @param string value The input string
' @param integer length The length the return value must be
' @param string character Optional, the character that should be used for filling, default: "0"
' @author Stefan Thoolen <mail@stefanthoolen.nl>
Public Function zerofill(ByVal value As String, ByVal length As Integer, Optional ByVal character = "0") As String
If Len(value) >= length Then zerofill = value: Exit Function
Dim i As Integer
Do
value = character & value
Loop While Len(value) < length
zerofill = value
End Function