is_between Modifier

Returns true if a date variable is between two other dates. Those dates can be the name of other variables or literal date strings.

date: November 15 2015
start_date: July 4 2015
end_date: December 1 2015

{{ if date | is_between($start_date, $end_date) }}

@if (Statamic::modify($date)->isBetween([$start_date, $end_date])->fetch()) @endif

true