module Chronic

Parse natural language dates and times into Time or Chronic::Span objects.

Examples:

require 'chronic'

Time.now   #=> Sun Aug 27 23:18:25 PDT 2006

Chronic.parse('tomorrow')
  #=> Mon Aug 28 12:00:00 PDT 2006

Chronic.parse('monday', :context => :past)
  #=> Mon Aug 21 12:00:00 PDT 2006

Constants

VERSION

Attributes

debug[RW]

Returns true when debug mode is enabled.

time_class[RW]

Examples:

require 'chronic'
require 'active_support/time'

Time.zone = 'UTC'
Chronic.time_class = Time.zone
Chronic.parse('June 15 2006 at 5:54 AM')
  # => Thu, 15 Jun 2006 05:45:00 UTC +00:00

Returns The Time class Chronic uses internally.

Public Class Methods

construct(year, month = 1, day = 1, hour = 0, minute = 0, second = 0) click to toggle source

Construct a new time object determining possible month overflows and leap years.

year - Integer year. month - Integer month. day - Integer day. hour - Integer hour. minute - Integer minute. second - Integer second.

Returns a new Time object constructed from these params.

# File lib/chronic.rb, line 101
def self.construct(year, month = 1, day = 1, hour = 0, minute = 0, second = 0)
  if second >= 60
    minute += second / 60
    second = second % 60
  end

  if minute >= 60
    hour += minute / 60
    minute = minute % 60
  end

  if hour >= 24
    day += hour / 24
    hour = hour % 24
  end

  # determine if there is a day overflow. this is complicated by our crappy calendar
  # system (non-constant number of days per month)
  day <= 56 || raise("day must be no more than 56 (makes month resolution easier)")
  if day > 28
    # no month ever has fewer than 28 days, so only do this if necessary
    leap_year_month_days = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    common_year_month_days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    days_this_month = Date.leap?(year) ? leap_year_month_days[month - 1] : common_year_month_days[month - 1]
    if day > days_this_month
      month += day / days_this_month
      day = day % days_this_month
    end
  end

  if month > 12
    if month % 12 == 0
      year += (month - 12) / 12
      month = 12
    else
      year += month / 12
      month = month % 12
    end
  end

  Chronic.time_class.local(year, month, day, hour, minute, second)
end

parse(text, options = {}) click to toggle source

Parses a string containing a natural language date or time.

If the parser can find a date or time, either a Time or Chronic::Span will be returned (depending on the value of `:guess`). If no date or time can be found, `nil` will be returned.

text - The String text to parse. opts - An optional Hash of configuration options passed to Chronic::Parser.new.

# File lib/chronic.rb, line 86
def self.parse(text, options = {})
  Parser.new(options).parse(text)
end