Tod

Supplies TimeOfDay class that includes parsing, strftime, comparison, and arithmetic.

Supplies Shift to represent a period of time, using a beginning and ending TimeOfDay. Allows to calculate its duration and to determine if a TimeOfDay is included inside the shift. For nightly shifts (when beginning time is greater than ending time), it supposes the shift ends the following day.

Installation

gem install tod

Examples

Loading Tod

require 'tod'

Creating from hour, minute, and second

TimeOfDay.new 8                                # => 08:00:00
TimeOfDay.new 8, 15, 30                        # => 08:15:30

Parsing text

Strings only need to contain an hour. Minutes, seconds, AM or PM, and colons are all optional.

TimeOfDay.parse "8"                            # => 08:00:00
TimeOfDay.parse "8am"                          # => 08:00:00
TimeOfDay.parse "8pm"                          # => 20:00:00
TimeOfDay.parse "8p"                           # => 20:00:00
TimeOfDay.parse "9:30"                         # => 09:30:00
TimeOfDay.parse "15:30"                        # => 15:30:00
TimeOfDay.parse "3:30pm"                       # => 15:30:00
TimeOfDay.parse "1230"                         # => 12:30:00
TimeOfDay.parse "3:25:58"                      # => 03:25:58
TimeOfDay.parse "515p"                         # => 17:15:00
TimeOfDay.parse "151253"                       # => 15:12:53
TimeOfDay.parse "noon"                         # => 12:00:00
TimeOfDay.parse "midnight"                     # => 00:00:00

TimeOfDay.parse raises an ArgumentError is the argument to parse is not parsable. TimeOfDay.try_parse will instead return nil if the argument is not parsable.

TimeOfDay.try_parse "3:30pm"                   # => 15:30:00
TimeOfDay.try_parse "foo"                      # => nil

Values can be tested with TimeOfDay.parsable? to see if they can be parsed.

TimeOfDay.parsable? "3:30pm"                   # => true
TimeOfDay.parsable? "foo"                      # => false

Adding or subtracting time

Seconds can be added to or subtracted TimeOfDay objects. Time correctly wraps around midnight.

TimeOfDay.new(8) + 3600                        # => 09:00:00
TimeOfDay.new(8) - 3600                        # => 07:00:00
TimeOfDay.new(0) - 30                          # => 23:59:30
TimeOfDay.new(23,59,45) + 30                   # => 00:00:15

Comparing

TimeOfDay includes Comparable.

TimeOfDay.new(8) < TimeOfDay.new(9)            # => true
TimeOfDay.new(8) == TimeOfDay.new(9)           # => false
TimeOfDay.new(9) == TimeOfDay.new(9)           # => true
TimeOfDay.new(10) > TimeOfDay.new(9)           # => true

Formatting

Format strings are passed to Time#strftime.

TimeOfDay.new(8,30).strftime("%H:%M")          # => "08:30"
TimeOfDay.new(17,15).strftime("%I:%M %p")      # => "05:15 PM"
TimeOfDay.new(22,5,15).strftime("%I:%M:%S %p") # => "10:05:15 PM"

Convenience methods for dates and times

Tod adds Date#on and Time#to_time_of_day. If you do not want the core extensions then require 'tod/time_of_day' instead of 'tod'.

tod = TimeOfDay.new 8, 30                       # => 08:30:00
tod.on Date.today                               # => 2010-12-29 08:30:00 -0600
Date.today.at tod                               # => 2010-12-29 08:30:00 -0600
Time.now.to_time_of_day                         # => 16:30:43
DateTime.now.to_time_of_day                     # => 16:30:43

Conversion method

Tod provides a conversion method which will handle a variety of input types:

TimeOfDay(TimeOfDay.new(8, 30))           # => 08:30:00
TimeOfDay("09:45")                        # => 09:45:00
TimeOfDay(Time.new(2014, 1, 1, 12, 30))   # => 12:30:00
TimeOfDay(Date.new(2014, 1, 1))           # => 00:00:00

Shifts

Represents a period of time, using a beginning and ending TimeOfDay. Allows to calculate its duration and to determine if a TimeOfDay is included inside the shift. For nightly shifts (when beginning time is greater than ending time), it supposes the shift ends the following day.

Creating from TimeOfDay

Shift.new(TimeOfDay.new(9), TimeOfDay.new(17))
Shift.new(TimeOfDay.new(22), TimeOfDay.new(4))

Duration

Shift.new(TimeOfDay.new(9), TimeOfDay.new(17)).duration # => 28800
Shift.new(TimeOfDay.new(20), TimeOfDay.new(2)).duration # => 21600

Include?

Shift.new(TimeOfDay.new(9), TimeOfDay.new(17)).include?(TimeOfDay.new(12)) # => true
Shift.new(TimeOfDay.new(9), TimeOfDay.new(17)).include?(TimeOfDay.new(7))  # => false
Shift.new(TimeOfDay.new(20), TimeOfDay.new(4)).include?(TimeOfDay.new(2))  # => true
Shift.new(TimeOfDay.new(20), TimeOfDay.new(4)).include?(TimeOfDay.new(18)) # => false

Rails Time Zone Support

If Rails time zone support is loaded, Date#on and TimeOfDay#at will automatically use Time.zone.

Active Record Serializable Attribute Support

TimeOfDay implements a custom serialization contract for activerecord serialize which allows to store TimeOfDay directly in a column of the time type. Example:

class Order < ActiveRecord::Base
  serialize :time, Tod::TimeOfDay
end
order = Order.create(time: TimeOfDay.new(9,30))
order.time                                      # => 09:30:00

Compatibility

Tod is compatible with Ruby 1.9.3, 2.0.0, 2.1.8, and 2.2.0. It is tested against Rails 3.2, 4.0, 4.1, 4.2.

Tod