Sorry to raise an issue which has been raised before (see http://lists.wfu.edu/pipermail/gretl-users/2013-January/008426.html)

If I take a csv file

date, value

2013.01, 3.145

2013.02, 6.290

Then import in gretl (v1.9.12 build date 2013-13-15) gretl still fails to recognise a timeseries! :

using delimiter ','

   longest line: 16 characters

   first field: 'idate'

   number of columns = 2

   number of variables: 2

   number of non-blank lines: 3

scanning for variable names...

   line: idate,value

scanning for row labels and data...

treating these as undated data

note it also re-labels the date  column as idate

Any ideas?