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Ice_cube is a ruby library for effectively taking care of repeated events (schedules). The force lies in the ability to indicate multiple rules, and have ice_cube rapidly make sense of whether the schedule falls on a specific date (.occurs_on?), or what times it happens at (.occurrences, .first, .all_occurrences).

How to get ice cube

For install use the below syntax

gem install

if you want to get the code

gem clone git://

For creating icecube schedule

schedule =
if we want to speciy startdate and enddate we have option to specify in the above mentioned schedule

schedule = =, :end_time => start + 600)

Daily schedules

After creating schedule we have an option to add recurrence rule for the above mentioned schedule

consider “schedule every day” on above mentioned time

schedule.add_recurrence_rule IceCube::Rule.daily

consider the same schedule with repeat “n” number of days

schedule.add_recurrence_rule IceCube::Rule.daily(repeat_every_n_days)

in place of repeat_every_n_days you have option to specify the number of days

Weekly schedules

Recurring rule to generate weekly schedule

schedule.add_recurrence_rule IceCube::Rule.weekly

recurring rule to add repeat n number of weeks with the same schedule

schedule.add_recurrence_rule IceCube::Rule.weekly(repeat_every_n_weeks)

Consider an example repeat the schedule on only week days (monday to friday)

schedule.add_recurrence_rule, 2, 3, 4, 5)

Every other week on monday and tuesday

schedule.add_recurrence_rule IceCube::Rule.weekly(2).day(:monday, :tuesday)
or you can mention as

schedule.add_recurrence_rule IceCube::Rule.weekly(2).day(:monday, :tuesday)

Monthly schedules

repeat the same schedule on every month

schedule.add_recurrence_rule IceCube::Rule.montly

Monthly schedules(by day of Month)
every month on the first and last days of the month

schedule.add_recurrence_rule IceCube::Rule.monthly.day_of_month(1, -1)

every other month on the 15th of the month

schedule.add_recurrence_rule IceCube::Rule.monthly(2).day_of_month(15)

Monthly (by day of Nth week)

# every month on the first and last tuesdays of the month

schedule.add_recurrence_rule IceCube::Rule.monthly.day_of_week(:tuesday => [1, -1])

# every other month on the first monday and last tuesday

schedule.add_recurrence_rule IceCube::Rule.monthly(2).day_of_week(:monday => [1],:tuesday => [-1])

Yearly(by day of year)

# every year on the 100th days from the beginning and end of the year

schedule.add_recurrence_rule IceCube::Rule.yearly.day_of_year(100, -100)

# every fourth year on new year’s eve

schedule.add_recurrence_rule IceCube::Rule.yearly(4).day_of_year(-1)

Yearly (by month of year)

# every year on the same day as start_time but in january and february

schedule.add_recurrence_rule IceCube::Rule.yearly.month_of_year(:january, :februrary)

# every third year in march

schedule.add_recurrence_rule IceCube::Rule.yearly(3).month_of_year(:march)

# for programatic convenience (same as above)

schedule.add_recurrence_rule IceCube::Rule.yearly(3).month_of_year(3)

Hourly (by hour of day)

# every hour on the same minute and second as start date

schedule.add_recurrence_rule IceCube::Rule.hourly

# every other hour, on mondays

schedule.add_recurrence_rule IceCube::Rule.hourly(2).day(:monday)
Minutely (every N minutes)

# every 10 minutes

schedule.add_recurrence_rule IceCube::Rule.minutely(10)

# every hour and a half, on the last tuesday of the month

schedule.add_recurrence_rule IceCube::Rule.minutely(90).day_of_week(:tuesday => [-1])

Secondly (every N seconds)

# every second

schedule.add_recurrence_rule IceCube::Rule.secondly

# every 15 seconds between 12:00 – 12:59

schedule.add_recurrence_rule IceCube::Rule.secondly(15).hour_of_day(12)

With ice_cube, you can specify exception times also
Example Repeat Every day except tomorrow

schedule = =
schedule.add_exception_time(now +
list occurrences until end_time
occurrences = schedule.occurrences(end_time)

# or the first (n) occurrences


# or the last (n) occurrences (if the schedule terminates)


Time Zones and ActiveSupport vs Standard Ruby Time Classes

ice_cube works great without ActiveSupport but only supports the environment’s single “local” time zone (ENV[‘TZ’]) or UTC. To correctly support multiple time zones (especially for DST), you should require ‘active_support/time’.
A schedule’s occurrences will be returned in the same class and time zone as the schedule’s start_time. Schedule start times are supported as:

  • Time.local (default when no time is specified)
  • Time.utc
  • ActiveSupport::TimeWithZone (with,, time.in_time_zone(tz))
  • DateTime (deprecated) and Date are converted to a Time.local


ice_cube implements its own hash-based .to_yaml, so you can quickly (and safely) serialize schedule objects in and out of your data store
It also supports serialization to/from ICAL.

yaml = schedule.to_yaml

hash = schedule.to_hash

ical = schedule.to_ical

Using your words

ice_cube can provide ical or string representations of individual rules, or the whole schedule.

rule = IceCube::Rule.daily(2).day_of_week(:tuesday => [1, -1], :wednesday => [2])

rule.to_ical # ‘FREQ=DAILY;INTERVAL=2;BYDAY=1TU,-1TU,2WE’

rule.to_s # ‘Every 2 days on the last and 1st Tuesdays and the 2nd Wednesday’

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