The Date Helper primarily creates select/option tags for different kinds of dates and date elements. All of the select-type methods share a number of common options that are as follows:

  • :prefix- overwrites the default prefix of “date” used for the select names. So specifying “birthday”

would give birthday instead of date if passed to the #select_month method.

  • :include_blank- set to true if it should be possible to set an empty date.

  • :discard_type- set to true if you want to discard the type part of the select name. If set to true, the #select_month method would use simply “date” (which can be overwritten using :prefix) instead of “date”.

Methods
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Instance Public methods
date_select(object_name, method, options = {}, html_options = {})

Returns a set of select tags (one for year, month, and day) pre-selected for accessing a specified date-based attribute (identified by method) on an object assigned to the template (identified by object). You can the output in the optionshash.

Options

  • :use_month_numbers- Set to true if you want to use month numbers rather than month names (e.g. “2” instead of “February”).

  • :use_short_month- Set to true if you want to use the abbreviated month name instead of the full name (e.g. “Feb” instead of “February”).

  • :add_month_number- Set to true if you want to show both, the month's number and name (e.g. “2 - February” instead of “February”).

  • :use_month_names- Set to an array with 12 month names if you want to customize month names. Note: You can also use Rails' new i18n functionality for this.

  • :date_separator- Specifies a string to separate the date fields. Default is “” (i.e. nothing).

  • :start_year- Set the start year for the year select. Default is Time.now.year - 5.

  • :end_year- Set the end year for the year select. Default is Time.now.year + 5.

  • :discard_day- Set to true if you don't want to show a day select. This includes the day as a hidden field instead of showing a select field. Also note that this implicitly sets the day to be the first of the given month in order to not create invalid dates like 31 February.

  • :discard_month- Set to true if you don't want to show a month select. This includes the month as a hidden field instead of showing a select field. Also note that this implicitly sets :discard_day to true.

  • :discard_year- Set to true if you don't want to show a year select. This includes the year as a hidden field instead of showing a select field.

  • :order- Set to an array containing :day, :monthand :yeardo customize the order in which the select fields are shown. If you leave out any of the symbols, the respective select will not be shown (like when you set :discard_xxx => true. Defaults to the order defined in the respective locale (e.g. [:year, :month, :day] in the en locale that ships with Rails).

  • :include_blank- Include a blank option in every select field so it's possible to set empty dates.

  • :default- Set a default date if the affected date isn't set or is nil.

  • :disabled- Set to true if you want show the select fields as disabled.

  • :prompt- Set to true (for a generic prompt), a prompt string or a hash of prompt strings for :year, :month, :day, :hour, :minuteand :second. Setting this option prepends a select option with a generic prompt (Day, Month, Year, Hour, Minute, Seconds) or the given prompt string.

If anything is passed in the html_optionshash it will be applied to every select tag in the set.

NOTE: Discarded selects will default to 1. So if no month select is available, January will be assumed.

Examples

# Generates a date select that when POSTed is stored in the post variable, in the written_on attribute
date_select("post", "written_on")
# Generates a date select that when POSTed is stored in the post variable, in the written_on attribute,
# with the year in the year drop down box starting at 1995.
date_select("post", "written_on", :start_year => 1995)
# Generates a date select that when POSTed is stored in the post variable, in the written_on attribute,
# with the year in the year drop down box starting at 1995, numbers used for months instead of words,
# and without a day select box.
date_select("post", "written_on", :start_year => 1995, :use_month_numbers => true,
                                  :discard_day => true, :include_blank => true)
# Generates a date select that when POSTed is stored in the post variable, in the written_on attribute
# with the fields ordered as day, month, year rather than month, day, year.
date_select("post", "written_on", :order => [:day, :month, :year])
# Generates a date select that when POSTed is stored in the user variable, in the birthday attribute
# lacking a year field.
date_select("user", "birthday", :order => [:month, :day])
# Generates a date select that when POSTed is stored in the user variable, in the birthday attribute
# which is initially set to the date 3 days from the current date
date_select("post", "written_on", :default => 3.days.from_now)
# Generates a date select that when POSTed is stored in the credit_card variable, in the bill_due attribute
# that will have a default day of 20.
date_select("credit_card", "bill_due", :default => { :day => 20 })
# Generates a date select with custom prompts
date_select("post", "written_on", :prompt => { :day => 'Select day', :month => 'Select month', :year => 'Select year' })

The selects are prepared for multi-parameter assignment to an Active Record object.

Note: If the day is not included as an option but the month is, the day will be set to the 1st to ensure that all month choices are valid.

# File actionpack/lib/action_view/helpers/date_helper.rb, line 198
def date_select(object_name, method, options = {}, html_options = {})
  InstanceTag.new(object_name, method, self, options.delete(:object)).to_date_select_tag(options, html_options)
end
datetime_select(object_name, method, options = {}, html_options = {})

Returns a set of select tags (one for year, month, day, hour, and minute) pre-selected for accessing a specified datetime-based attribute (identified by method) on an object assigned to the template (identified by object). Examples:

If anything is passed in the html_options hash it will be applied to every select tag in the set.

Examples

# Generates a datetime select that, when POSTed, will be stored in the post variable in the written_on
# attribute
datetime_select("post", "written_on")
# Generates a datetime select with a year select that starts at 1995 that, when POSTed, will be stored in the
# post variable in the written_on attribute.
datetime_select("post", "written_on", :start_year => 1995)
# Generates a datetime select with a default value of 3 days from the current time that, when POSTed, will
# be stored in the trip variable in the departing attribute.
datetime_select("trip", "departing", :default => 3.days.from_now)
# Generates a datetime select that discards the type that, when POSTed, will be stored in the post variable
# as the written_on attribute.
datetime_select("post", "written_on", :discard_type => true)
# Generates a datetime select with a custom prompt. Use :prompt=>true for generic prompts.
datetime_select("post", "written_on", :prompt => {:day => 'Choose day', :month => 'Choose month', :year => 'Choose year'})
datetime_select("post", "written_on", :prompt => {:hour => true}) # generic prompt for hours
datetime_select("post", "written_on", :prompt => true) # generic prompts for all

The selects are prepared for multi-parameter assignment to an Active Record object.

# File actionpack/lib/action_view/helpers/date_helper.rb, line 275
def datetime_select(object_name, method, options = {}, html_options = {})
  InstanceTag.new(object_name, method, self, options.delete(:object)).to_datetime_select_tag(options, html_options)
end
distance_of_time_in_words(from_time, to_time = 0, include_seconds = false, options = {})

Reports the approximate distance in time between two Time or Date objects or integers as seconds. Set include_secondsto true if you want more detailed approximations when distance < 1 min, 29 secs Distances are reported based on the following table:

0 <-> 29 secs                                                             # => less than a minute
30 secs <-> 1 min, 29 secs                                                # => 1 minute
1 min, 30 secs <-> 44 mins, 29 secs                                       # => [2..44] minutes
44 mins, 30 secs <-> 89 mins, 29 secs                                     # => about 1 hour
89 mins, 29 secs <-> 23 hrs, 59 mins, 29 secs                             # => about [2..24] hours
23 hrs, 59 mins, 29 secs <-> 47 hrs, 59 mins, 29 secs                     # => 1 day
47 hrs, 59 mins, 29 secs <-> 29 days, 23 hrs, 59 mins, 29 secs            # => [2..29] days
29 days, 23 hrs, 59 mins, 30 secs <-> 59 days, 23 hrs, 59 mins, 29 secs   # => about 1 month
59 days, 23 hrs, 59 mins, 30 secs <-> 1 yr minus 1 sec                    # => [2..12] months
1 yr <-> 1 yr, 3 months                                                   # => about 1 year
1 yr, 3 months <-> 1 yr, 9 months                                         # => over 1 year
1 yr, 9 months <-> 2 yr minus 1 sec                                       # => almost 2 years
2 yrs <-> max time or date                                                # => (same rules as 1 yr)

With include_seconds= true and the difference < 1 minute 29 seconds:

0-4   secs      # => less than 5 seconds
5-9   secs      # => less than 10 seconds
10-19 secs      # => less than 20 seconds
20-39 secs      # => half a minute
40-59 secs      # => less than a minute
60-89 secs      # => 1 minute

Examples

from_time = Time.now
distance_of_time_in_words(from_time, from_time + 50.minutes)        # => about 1 hour
distance_of_time_in_words(from_time, 50.minutes.from_now)           # => about 1 hour
distance_of_time_in_words(from_time, from_time + 15.seconds)        # => less than a minute
distance_of_time_in_words(from_time, from_time + 15.seconds, true)  # => less than 20 seconds
distance_of_time_in_words(from_time, 3.years.from_now)              # => about 3 years
distance_of_time_in_words(from_time, from_time + 60.hours)          # => about 3 days
distance_of_time_in_words(from_time, from_time + 45.seconds, true)  # => less than a minute
distance_of_time_in_words(from_time, from_time - 45.seconds, true)  # => less than a minute
distance_of_time_in_words(from_time, 76.seconds.from_now)           # => 1 minute
distance_of_time_in_words(from_time, from_time + 1.year + 3.days)   # => about 1 year
distance_of_time_in_words(from_time, from_time + 3.years + 6.months) # => over 3 years
distance_of_time_in_words(from_time, from_time + 4.years + 9.days + 30.minutes + 5.seconds) # => about 4 years
to_time = Time.now + 6.years + 19.days
distance_of_time_in_words(from_time, to_time, true)     # => about 6 years
distance_of_time_in_words(to_time, from_time, true)     # => about 6 years
distance_of_time_in_words(Time.now, Time.now)           # => less than a minute
# File actionpack/lib/action_view/helpers/date_helper.rb, line 63
def distance_of_time_in_words(from_time, to_time = 0, include_seconds = false, options = {})
  from_time = from_time.to_time if from_time.respond_to?(:to_time)
  to_time = to_time.to_time if to_time.respond_to?(:to_time)
  distance_in_minutes = (((to_time - from_time).abs)/60).round
  distance_in_seconds = ((to_time - from_time).abs).round
  I18n.with_options :locale => options[:locale], :scope => :'datetime.distance_in_words' do |locale|
    case distance_in_minutes
      when 0..1
        return distance_in_minutes == 0 ?
               locale.t(:less_than_x_minutes, :count => 1) :
               locale.t(:x_minutes, :count => distance_in_minutes) unless include_seconds
        case distance_in_seconds
          when 0..4   then locale.t :less_than_x_seconds, :count => 5
          when 5..9   then locale.t :less_than_x_seconds, :count => 10
          when 10..19 then locale.t :less_than_x_seconds, :count => 20
          when 20..39 then locale.t :half_a_minute
          when 40..59 then locale.t :less_than_x_minutes, :count => 1
          else             locale.t :x_minutes,           :count => 1
        end
      when 2..44           then locale.t :x_minutes,      :count => distance_in_minutes
      when 45..89          then locale.t :about_x_hours,  :count => 1
      when 90..1439        then locale.t :about_x_hours,  :count => (distance_in_minutes.to_f / 60.0).round
      when 1440..2529      then locale.t :x_days,         :count => 1
      when 2530..43199     then locale.t :x_days,         :count => (distance_in_minutes.to_f / 1440.0).round
      when 43200..86399    then locale.t :about_x_months, :count => 1
      when 86400..525599   then locale.t :x_months,       :count => (distance_in_minutes.to_f / 43200.0).round
      else
        distance_in_years           = distance_in_minutes / 525600
        minute_offset_for_leap_year = (distance_in_years / 4) * 1440
        remainder                   = ((distance_in_minutes - minute_offset_for_leap_year) % 525600)
        if remainder < 131400
          locale.t(:about_x_years,  :count => distance_in_years)
        elsif remainder < 394200
          locale.t(:over_x_years,   :count => distance_in_years)
        else
          locale.t(:almost_x_years, :count => distance_in_years + 1)
        end
    end
  end
end
distance_of_time_in_words_to_now(from_time, include_seconds = false)
select_date(date = Date.current, options = {}, html_options = {})

Returns a set of html select-tags (one for year, month, and day) pre-selected with the date. It's possible to explicitly set the order of the tags using the :orderoption with an array of symbols :year, :monthand :dayin the desired order. If you do not supply a Symbol, it will be appended onto the :orderpassed in.

If anything is passed in the html_options hash it will be applied to every select tag in the set.

Examples

my_date = Time.today + 6.days
# Generates a date select that defaults to the date in my_date (six days after today)
select_date(my_date)
# Generates a date select that defaults to today (no specified date)
select_date()
# Generates a date select that defaults to the date in my_date (six days after today)
# with the fields ordered year, month, day rather than month, day, year.
select_date(my_date, :order => [:year, :month, :day])
# Generates a date select that discards the type of the field and defaults to the date in
# my_date (six days after today)
select_date(my_date, :discard_type => true)
# Generates a date select that defaults to the date in my_date,
# which has fields separated by '/'
select_date(my_date, :date_separator => '/')
# Generates a date select that defaults to the datetime in my_date (six days after today)
# prefixed with 'payday' rather than 'date'
select_date(my_date, :prefix => 'payday')
# Generates a date select with a custom prompt. Use :prompt=>true for generic prompts.
select_date(my_date, :prompt => {:day => 'Choose day', :month => 'Choose month', :year => 'Choose year'})
select_date(my_date, :prompt => {:hour => true}) # generic prompt for hours
select_date(my_date, :prompt => true) # generic prompts for all
# File actionpack/lib/action_view/helpers/date_helper.rb, line 364
def select_date(date = Date.current, options = {}, html_options = {})
  DateTimeSelector.new(date, options, html_options).select_date
end
select_datetime(datetime = Time.current, options = {}, html_options = {})

Returns a set of html select-tags (one for year, month, day, hour, and minute) pre-selected with the datetime. It's also possible to explicitly set the order of the tags using the :order option with an array of symbols :year, :monthand :dayin the desired order. If you do not supply a Symbol, it will be appended onto the :orderpassed in. You can also add :date_separator, :datetime_separatorand :time_separatorkeys to the optionsto control visual display of the elements.

If anything is passed in the html_options hash it will be applied to every select tag in the set.

Examples

my_date_time = Time.now + 4.days
# Generates a datetime select that defaults to the datetime in my_date_time (four days after today)
select_datetime(my_date_time)
# Generates a datetime select that defaults to today (no specified datetime)
select_datetime()
# Generates a datetime select that defaults to the datetime in my_date_time (four days after today)
# with the fields ordered year, month, day rather than month, day, year.
select_datetime(my_date_time, :order => [:year, :month, :day])
# Generates a datetime select that defaults to the datetime in my_date_time (four days after today)
# with a '/' between each date field.
select_datetime(my_date_time, :date_separator => '/')
# Generates a datetime select that defaults to the datetime in my_date_time (four days after today)
# with a date fields separated by '/', time fields separated by '' and the date and time fields
# separated by a comma (',').
select_datetime(my_date_time, :date_separator => '/', :time_separator => '', :datetime_separator => ',')
# Generates a datetime select that discards the type of the field and defaults to the datetime in
# my_date_time (four days after today)
select_datetime(my_date_time, :discard_type => true)
# Generates a datetime select that defaults to the datetime in my_date_time (four days after today)
# prefixed with 'payday' rather than 'date'
select_datetime(my_date_time, :prefix => 'payday')
# Generates a datetime select with a custom prompt. Use :prompt=>true for generic prompts.
select_datetime(my_date_time, :prompt => {:day => 'Choose day', :month => 'Choose month', :year => 'Choose year'})
select_datetime(my_date_time, :prompt => {:hour => true}) # generic prompt for hours
select_datetime(my_date_time, :prompt => true) # generic prompts for all
# File actionpack/lib/action_view/helpers/date_helper.rb, line 323
def select_datetime(datetime = Time.current, options = {}, html_options = {})
  DateTimeSelector.new(datetime, options, html_options).select_datetime
end
select_day(date, options = {}, html_options = {})

Returns a select tag with options for each of the days 1 through 31 with the current day selected. The datecan also be substituted for a hour number. Override the field name using the :field_name option, 'day' by default.

Examples

my_date = Time.today + 2.days
# Generates a select field for days that defaults to the day for the date in my_date
select_day(my_time)
# Generates a select field for days that defaults to the number given
select_day(5)
# Generates a select field for days that defaults to the day for the date in my_date
# that is named 'due' rather than 'day'
select_day(my_time, :field_name => 'due')
# Generates a select field for days with a custom prompt.  Use :prompt => true for a
# generic prompt.
select_day(5, :prompt => 'Choose day')
# File actionpack/lib/action_view/helpers/date_helper.rb, line 501
def select_day(date, options = {}, html_options = {})
  DateTimeSelector.new(date, options, html_options).select_day
end
select_hour(datetime, options = {}, html_options = {})

Returns a select tag with options for each of the hours 0 through 23 with the current hour selected. The hourcan also be substituted for a hour number. Override the field name using the :field_nameoption, 'hour' by default.

Examples

my_time = Time.now + 6.hours
# Generates a select field for hours that defaults to the hour for the time in my_time
select_hour(my_time)
# Generates a select field for hours that defaults to the number given
select_hour(13)
# Generates a select field for hours that defaults to the minutes for the time in my_time
# that is named 'stride' rather than 'second'
select_hour(my_time, :field_name => 'stride')
# Generates a select field for hours with a custom prompt.  Use :prompt => true for a
# generic prompt.
select_hour(13, :prompt =>'Choose hour')
# File actionpack/lib/action_view/helpers/date_helper.rb, line 476
def select_hour(datetime, options = {}, html_options = {})
  DateTimeSelector.new(datetime, options, html_options).select_hour
end
select_minute(datetime, options = {}, html_options = {})

Returns a select tag with options for each of the minutes 0 through 59 with the current minute selected. Also can return a select tag with options by minute_stepfrom 0 through 59 with the 00 minute selected. The minutecan also be substituted for a minute number. Override the field name using the :field_nameoption, 'minute' by default.

Examples

my_time = Time.now + 6.hours
# Generates a select field for minutes that defaults to the minutes for the time in my_time
select_minute(my_time)
# Generates a select field for minutes that defaults to the number given
select_minute(14)
# Generates a select field for minutes that defaults to the minutes for the time in my_time
# that is named 'stride' rather than 'second'
select_minute(my_time, :field_name => 'stride')
# Generates a select field for minutes with a custom prompt.  Use :prompt=>true for a
# generic prompt.
select_minute(14, :prompt => 'Choose minutes')
# File actionpack/lib/action_view/helpers/date_helper.rb, line 451
def select_minute(datetime, options = {}, html_options = {})
  DateTimeSelector.new(datetime, options, html_options).select_minute
end
select_month(date, options = {}, html_options = {})

Returns a select tag with options for each of the months January through December with the current month selected. The month names are presented as keys (what's shown to the user) and the month numbers (1-12) are used as values (what's submitted to the server). It's also possible to use month numbers for the presentation instead of names – set the :use_month_numberskey in optionsto true for this to happen. If you want both numbers and names, set the :add_month_numberskey in optionsto true. If you would prefer to show month names as abbreviations, set the :use_short_monthkey in optionsto true. If you want to use your own month names, set the :use_month_nameskey in optionsto an array of 12 month names. Override the field name using the :field_nameoption, 'month' by default.

Examples

# Generates a select field for months that defaults to the current month that
# will use keys like "January", "March".
select_month(Date.today)
# Generates a select field for months that defaults to the current month that
# is named "start" rather than "month"
select_month(Date.today, :field_name => 'start')
# Generates a select field for months that defaults to the current month that
# will use keys like "1", "3".
select_month(Date.today, :use_month_numbers => true)
# Generates a select field for months that defaults to the current month that
# will use keys like "1 - January", "3 - March".
select_month(Date.today, :add_month_numbers => true)
# Generates a select field for months that defaults to the current month that
# will use keys like "Jan", "Mar".
select_month(Date.today, :use_short_month => true)
# Generates a select field for months that defaults to the current month that
# will use keys like "Januar", "Marts."
select_month(Date.today, :use_month_names => %w(Januar Februar Marts ...))
# Generates a select field for months with a custom prompt.  Use :prompt => true for a
# generic prompt.
select_month(14, :prompt => 'Choose month')
# File actionpack/lib/action_view/helpers/date_helper.rb, line 543
def select_month(date, options = {}, html_options = {})
  DateTimeSelector.new(date, options, html_options).select_month
end
select_second(datetime, options = {}, html_options = {})

Returns a select tag with options for each of the seconds 0 through 59 with the current second selected. The secondcan also be substituted for a second number. Override the field name using the :field_nameoption, 'second' by default.

Examples

my_time = Time.now + 16.minutes
# Generates a select field for seconds that defaults to the seconds for the time in my_time
select_second(my_time)
# Generates a select field for seconds that defaults to the number given
select_second(33)
# Generates a select field for seconds that defaults to the seconds for the time in my_time
# that is named 'interval' rather than 'second'
select_second(my_time, :field_name => 'interval')
# Generates a select field for seconds with a custom prompt.  Use :prompt=>true for a
# generic prompt.
select_minute(14, :prompt => 'Choose seconds')
# File actionpack/lib/action_view/helpers/date_helper.rb, line 425
def select_second(datetime, options = {}, html_options = {})
  DateTimeSelector.new(datetime, options, html_options).select_second
end
select_time(datetime = Time.current, options = {}, html_options = {})

Returns a set of html select-tags (one for hour and minute) You can set :time_separatorkey to format the output, and the :include_secondsoption to include an input for seconds.

If anything is passed in the html_options hash it will be applied to every select tag in the set.

Examples

my_time = Time.now + 5.days + 7.hours + 3.minutes + 14.seconds
# Generates a time select that defaults to the time in my_time
select_time(my_time)
# Generates a time select that defaults to the current time (no specified time)
select_time()
# Generates a time select that defaults to the time in my_time,
# which has fields separated by ':'
select_time(my_time, :time_separator => ':')
# Generates a time select that defaults to the time in my_time,
# that also includes an input for seconds
select_time(my_time, :include_seconds => true)
# Generates a time select that defaults to the time in my_time, that has fields
# separated by ':' and includes an input for seconds
select_time(my_time, :time_separator => ':', :include_seconds => true)
# Generates a time select with a custom prompt. Use :prompt=>true for generic prompts.
select_time(my_time, :prompt => {:day => 'Choose day', :month => 'Choose month', :year => 'Choose year'})
select_time(my_time, :prompt => {:hour => true}) # generic prompt for hours
select_time(my_time, :prompt => true) # generic prompts for all
# File actionpack/lib/action_view/helpers/date_helper.rb, line 400
def select_time(datetime = Time.current, options = {}, html_options = {})
  DateTimeSelector.new(datetime, options, html_options).select_time
end
select_year(date, options = {}, html_options = {})

Returns a select tag with options for each of the five years on each side of the current, which is selected. The five year radius can be changed using the :start_yearand :end_yearkeys in the options. Both ascending and descending year lists are supported by making :start_yearless than or greater than :end_year. The datecan also be substituted for a year given as a number. Override the field name using the :field_nameoption, 'year' by default.

Examples

# Generates a select field for years that defaults to the current year that
# has ascending year values
select_year(Date.today, :start_year => 1992, :end_year => 2007)
# Generates a select field for years that defaults to the current year that
# is named 'birth' rather than 'year'
select_year(Date.today, :field_name => 'birth')
# Generates a select field for years that defaults to the current year that
# has descending year values
select_year(Date.today, :start_year => 2005, :end_year => 1900)
# Generates a select field for years that defaults to the year 2006 that
# has ascending year values
select_year(2006, :start_year => 2000, :end_year => 2010)
# Generates a select field for years with a custom prompt.  Use :prompt => true for a
# generic prompt.
select_year(14, :prompt => 'Choose year')
# File actionpack/lib/action_view/helpers/date_helper.rb, line 574
def select_year(date, options = {}, html_options = {})
  DateTimeSelector.new(date, options, html_options).select_year
end
time_ago_in_words(from_time, include_seconds = false)

Like #distance_of_time_in_words, but where to_timeis fixed to Time.now.

Examples

time_ago_in_words(3.minutes.from_now)       # => 3 minutes
time_ago_in_words(Time.now - 15.hours)      # => 15 hours
time_ago_in_words(Time.now)                 # => less than a minute
from_time = Time.now - 3.days - 14.minutes - 25.seconds     # => 3 days
# File actionpack/lib/action_view/helpers/date_helper.rb, line 115
def time_ago_in_words(from_time, include_seconds = false)
  distance_of_time_in_words(from_time, Time.now, include_seconds)
end
time_select(object_name, method, options = {}, html_options = {})

Returns a set of select tags (one for hour, minute and optionally second) pre-selected for accessing a specified time-based attribute (identified by method) on an object assigned to the template (identified by object). You can include the seconds with :include_seconds.

This method will also generate 3 input hidden tags, for the actual year, month and day unless the option :ignore_dateis set to true.

If anything is passed in the html_options hash it will be applied to every select tag in the set.

Examples

# Creates a time select tag that, when POSTed, will be stored in the post variable in the sunrise attribute
time_select("post", "sunrise")
# Creates a time select tag that, when POSTed, will be stored in the order variable in the submitted
# attribute
time_select("order", "submitted")
# Creates a time select tag that, when POSTed, will be stored in the mail variable in the sent_at attribute
time_select("mail", "sent_at")
# Creates a time select tag with a seconds field that, when POSTed, will be stored in the post variables in
# the sunrise attribute.
time_select("post", "start_time", :include_seconds => true)
# Creates a time select tag with a seconds field that, when POSTed, will be stored in the entry variables in
# the submission_time attribute.
time_select("entry", "submission_time", :include_seconds => true)
# You can set the :minute_step to 15 which will give you: 00, 15, 30 and 45.
time_select 'game', 'game_time', {:minute_step => 15}
# Creates a time select tag with a custom prompt. Use :prompt => true for generic prompts.
time_select("post", "written_on", :prompt => {:hour => 'Choose hour', :minute => 'Choose minute', :second => 'Choose seconds'})
time_select("post", "written_on", :prompt => {:hour => true}) # generic prompt for hours
time_select("post", "written_on", :prompt => true) # generic prompts for all

The selects are prepared for multi-parameter assignment to an Active Record object.

Note: If the day is not included as an option but the month is, the day will be set to the 1st to ensure that all month choices are valid.

# File actionpack/lib/action_view/helpers/date_helper.rb, line 242
def time_select(object_name, method, options = {}, html_options = {})
  InstanceTag.new(object_name, method, self, options.delete(:object)).to_time_select_tag(options, html_options)
end