st: format date

[Jorge Tuesta <Jtuesta@sil.org.pe>]

I have the list

var1
1
2
3
4
5


I´d like convert this in format date

using             format var1 %dl
I have:

jan
jan
jan
jan
jan

but i´d like

jan
feb
mar
...

How can i do?

thank´s in advance




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