Use Split() to get the parts of your input string. Feed the correct parts to DateSerial()/CDate() to get a Date that should display/print as /d/m/y if that's the way of your locale/Regional settings. If you don't need a Date, build the desired String
via Join(). As in:
Option Explicit
Function mkDicMonth()
Dim dicT : Set dicT = CreateObject("Scripting.Dictionary")
Dim i
For i = 1 To 12
dicT(MonthName(i, True)) = i
Next
Set mkDicMonth = dicT
End Function
Dim sInp : sInp = "Wed, 10 Jan 2018 17:23:34 UTC"
Dim dicM : Set dicM = mkDicMonth()
Dim aParts : aParts = Split(sInp)
Dim sOtp : sOtp = Join(Array(aParts(1), dicM(aParts(2)), aParts(3)), "/")
WScript.Echo TypeName(sOtp), sOtp
Dim dtOtp
' DateSerial
dtOtp = DateSerial(CInt(aParts(3)), CInt(dicM(aParts(2))), CInt(aParts(1)))
WScript.Echo 1, TypeName(dtOtp), dtOtp, "(german locale, dmy)"
' CDate (risky, order, locale dependent)
dtOtp = CDate(sOtp)
WScript.Echo 2, TypeName(dtOtp), dtOtp, "(german locale, dmy)"
' CDate (risky, monthname, locale dependent)
dtOtp = CDate(Join(Array(aParts(1), aParts(2), aParts(3))))
WScript.Echo 3, TypeName(dtOtp), dtOtp, "(german locale, dmy)"
output:
cscript 48193001.vbs
String 10/1/2018
1 Date 10.01.2018 (german locale, dmy)
2 Date 10.01.2018 (german locale, dmy)
3 Date 10.01.2018 (german locale, dmy)