Trying to input Jun-15 corrects it to 06/15/15

Is there any way to disable this? I don’t want it to show the date, but I want to be able to show Month-Year

You can format the date display to show mm/yy and then extend this option to give you mm-yy. Right click on the column heading and select FORMAT CELLS then and then choose the format you want. The default is 12/99. If you wish to change this to 12-99 instead of 12/99 modify the field you will find under USER DEFINED. Change this to 12-99 and choose OK.

If you need to repeat this for further columns, you will find your user defined option of 12-99 is now available for you to select directly. Then Jun-15 will give you 06-15 and so on…Peter