Explanation
The TEXT function applies the number format you specify to a numeric value, and returns a result as text.
In this case, the number format provided is "yyyymm", which joins a 4-digit year with a 2-digit month value.
Display only option
If you only want to display a date with the year and month, you can simply apply the custom number format "yyyymm" to the date(s). This will cause Excel to display the year and month together, but will not change the underlying date.
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Related functions
TEXT Function
The Excel TEXT function returns a number formatted as text. This makes it easy to embed a formatted number (e.g., dates, times, currencies, percentages, fractions, etc.) in a text string with the number format of your choice.
