RelativeDate: A relative date (based on the current date). Valid only if the type is DATE_BEFORE, DATE_AFTER, DATE_ON_OR_BEFORE or DATE_ON_OR_AFTER.
Relative dates are not supported in data validation. They are supported only in conditional formatting and conditional filters.
"RELATIVE_DATE_UNSPECIFIED" - Default value, do not use. "PAST_YEAR" - The value is one year before today. "PAST_MONTH" - The value is one month before today. "PAST_WEEK" - The value is one week before today. "YESTERDAY" - The value is yesterday. "TODAY" - The value is today. "TOMORROW" - The value is tomorrow.