From the labels you're getting, the highlighted cells in your spreadsheet column must be dates, which are stored as integer numbers by Excel, but displayed in your local date/time format in the sheet.
Column names in Talend must be valid Java variables, which can only begin with a letter, underscore or dollar sign, but not a numeric digit.
Therefore the Talend Excel metadata wizard has to convert the column names it is reading from the spreadsheet (which are integer numbers) into something which is valid, and in this case it's taking the last four digits of the integer representing the date, and adding an underscore to make this a valid Java variable name.
If you want to see the integer values for each column, then simply copy the cells in Excel, and use "Paste Special" to paste the values somewhere. You'll see that these are indeed integer numbers, and the last four digits of each will correspond to the column names you're seeing in Talend.
Your only options are to either change the columns in your spreadsheet, or in the metadata wizard.
For what it's worth, even if the date values in the columns were being stored and read in by the wizard as strings, they'd still be invalid for variable/Column names, as these can't include dashes/minus signs, and again they can't begin with a numeric digit. The dashes would have to be replaced by underscores, and the whole thing prefixed with another underscore.