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When using Excel, a partial date entry such as MM-DD ie: 1-25 will automatically result in conversion to the configured format, for example MM/DD/YYYY or 1/25/2018. This does not occur by default in Calc. Although the ISO 8601 date format of YYYY-MM-DD is the most logical, it is not what Americans are accustomed to. When using Excel, a partial date entry such as MM-DD ie: 1-25 will automatically result in conversion to the configured format, for example MM/DD/YYYY or 1/25/2018. This does not occur by default in Calc because Calc doesn't recognize the dash as a date separator. This was not a problem in older versions (3.5x and earlier). Tip: CTRL + ; will automatically enter the current date in the active cell.