My data set is monthly from Jan 1997 to Dec 2021. I need the month code to be in the correct format, however as.date doesn't recognise the cell contents as they are. Please help.
Month BrentSpot GDP Agriculture Production Construction Services
1 Jan-1997 23.54 63.8229 53.5614 81.9963 87.2775 59.4453
2 Feb-1997 20.85 64.7182 53.9091 82.1917 87.8350 60.5018
3 Mar-1997 19.13 64.9264 54.2569 81.6142 88.6714 60.8375
4 Apr-1997 17.56 65.2327 55.1264 82.0006 89.5170 61.0981
5 May-1997 19.02 64.7336 55.8220 82.0093 89.8144 60.4470
6 Jun-1997 17.58 65.1322 56.3438 82.3350 89.4891 60.8886