sheet col row longname input keystrokes comment open-file sample_data/benchmark.csv o benchmark Date type-date @ benchmark Date addcol-expr Date+1 addcol-expr benchmark Date+1 type-date @ benchmark Date+1 addcol-expr 1+Date addcol-expr benchmark 1+Date type-date @ benchmark 1+Date addcol-expr Date+15*minutes addcol-expr benchmark Date+15*minutes type-date @ benchmark columns-sheet C benchmark_columns fmtstr ă‚­Date+15*minutes edit-cell %Y-%m-%d %H:%M:%S e benchmark_columns quit-sheet q benchmark Date type-date @