title: Function that shows numerical day of month in increments of 7 days (DAY/DATE?)
body: <p>In each column header I'm looking to display only the numerical day of the first Monday of every week in the year (e.g. January 4, 2021 displays as &quot;4&quot; in a column header) and every subsequent column adds 7 days to that date to display the day of the next Monday.<p> Adding +7 to the DAY function doesn't work because it adds 7 to the number value and not the date. Any ideas?</p><p>For example, the string of column headers would look like 4, 11, 18, 25, 1, 8, 15, etc. (Jan 4, Jan 11, etc.).</p></p>