interval property
int
interval
The INTERVAL
rule part contains a positive integer representing at which
intervals the recurrence rule repeats.
The default value is "1", meaning every second for a SECONDLY rule, every minute for a MINUTELY rule, every hour for an HOURLY rule, every day for a DAILY rule, every week for a WEEKLY rule, every month for a MONTHLY rule, and every year for a YEARLY rule. For example, within a DAILY rule, a value of "8" means every eight days.
Implementation
int get interval => _interval ?? 1;