We have a financial period in the system as '201801' how do I convert it to (01/04/2018) where (2018) is year and (01) is financial period but April not Jan

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 so example
 201801 - 01/04/2018
 201802 - 01/05/2018
 201803 - 01/06/2018
 201803 - 01/07/2018
 201803 - 01/08/2018
 201803 - 01/09/2018
 201803 - 01/10/2018
 201803 - 01/11/2018
 201803 - 01/12/2018
 201803 - 01/01/2019
 201803 - 01/02/2019
 201803 - 01/03/2019

```

I am using MSSQL and SSMS