Qlik Month format vs hardcoded

[arusiva89]

I have used the formula in load script 

If(Month='Jan','Dec',If(Month='Feb','Jan' like this) but it is differs from qlik Month format so I couldn't able to connect .What format I should use to connect with qlik month format

[dplr-rn]

not clear at all. explain a bit more.

1 what and why you are doing

2 error that you are getting. (what do you mean by couldnt connect to)