Class: Time

Inherits:
Object
  • Object
show all
Defined in:
lib/rubysl/time/time.rb

Overview

Implements the extensions to the Time class that are described in the documentation for the time.rb library.

Constant Summary collapse

ZoneOffset = 
{
  'UTC' => 0,
  # ISO 8601
  'Z' => 0,
  # RFC 822
  'UT' => 0, 'GMT' => 0,
  'EST' => -5, 'EDT' => -4,
  'CST' => -6, 'CDT' => -5,
  'MST' => -7, 'MDT' => -6,
  'PST' => -8, 'PDT' => -7,
  # Following definition of military zones is original one.
  # See RFC 1123 and RFC 2822 for the error in RFC 822.
  'A' => +1, 'B' => +2, 'C' => +3, 'D' => +4,  'E' => +5,  'F' => +6, 
  'G' => +7, 'H' => +8, 'I' => +9, 'K' => +10, 'L' => +11, 'M' => +12,
  'N' => -1, 'O' => -2, 'P' => -3, 'Q' => -4,  'R' => -5,  'S' => -6, 
  'T' => -7, 'U' => -8, 'V' => -9, 'W' => -10, 'X' => -11, 'Y' => -12,
}
LeapYearMonthDays = 
[31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
CommonYearMonthDays = 
[31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
MonthValue = 
{
  'JAN' => 1, 'FEB' => 2, 'MAR' => 3, 'APR' => 4, 'MAY' => 5, 'JUN' => 6,
  'JUL' => 7, 'AUG' => 8, 'SEP' => 9, 'OCT' =>10, 'NOV' =>11, 'DEC' =>12
}
RFC2822_DAY_NAME = 
[
  'Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'
]
RFC2822_MONTH_NAME = 
[
  'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
  'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'
]

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.apply_offset(year, mon, day, hour, min, sec, off) ⇒ Object 



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# File 'lib/rubysl/time/time.rb', line 108

def apply_offset(year, mon, day, hour, min, sec, off)
  if off < 0
    off = -off
    off, o = off.divmod(60)
    if o != 0 then sec += o; o, sec = sec.divmod(60); off += o end
    off, o = off.divmod(60)
    if o != 0 then min += o; o, min = min.divmod(60); off += o end
    off, o = off.divmod(24)
    if o != 0 then hour += o; o, hour = hour.divmod(24); off += o end
    if off != 0
      day += off
      if month_days(year, mon) < day
        mon += 1
        if 12 < mon
          mon = 1
          year += 1
        end
        day = 1
      end
    end
  elsif 0 < off
    off, o = off.divmod(60)
    if o != 0 then sec -= o; o, sec = sec.divmod(60); off -= o end
    off, o = off.divmod(60)
    if o != 0 then min -= o; o, min = min.divmod(60); off -= o end
    off, o = off.divmod(24)
    if o != 0 then hour -= o; o, hour = hour.divmod(24); off -= o end
    if off != 0 then
      day -= off
      if day < 1
        mon -= 1
        if mon < 1
          year -= 1
          mon = 12
        end
        day = month_days(year, mon)
      end
    end
  end
  return year, mon, day, hour, min, sec
end

.httpdate(date) ⇒ Object

Parses date as HTTP-date defined by RFC 2616 and converts it to a Time object.

ArgumentError is raised if date is not compliant with RFC 2616 or Time class cannot represent specified date.

See #httpdate for more information on this format.



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# File 'lib/rubysl/time/time.rb', line 310

def httpdate(date)
  if /\A\s*
      (?:Mon|Tue|Wed|Thu|Fri|Sat|Sun),\x20
      (\d{2})\x20
      (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\x20
      (\d{4})\x20
      (\d{2}):(\d{2}):(\d{2})\x20
      GMT
      \s*\z/ix =~ date
    self.rfc2822(date)
  elsif /\A\s*
         (?:Monday|Tuesday|Wednesday|Thursday|Friday|Saturday|Sunday),\x20
         (\d\d)-(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)-(\d\d)\x20
         (\d\d):(\d\d):(\d\d)\x20
         GMT
         \s*\z/ix =~ date
    self.parse(date)
  elsif /\A\s*
         (?:Mon|Tue|Wed|Thu|Fri|Sat|Sun)\x20
         (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\x20
         (\d\d|\x20\d)\x20
         (\d\d):(\d\d):(\d\d)\x20
         (\d{4})
         \s*\z/ix =~ date
    self.utc($6.to_i, MonthValue[$1.upcase], $2.to_i,
             $3.to_i, $4.to_i, $5.to_i)
  else
    raise ArgumentError.new("not RFC 2616 compliant date: #{date.inspect}")
  end
end

.iso8601 ⇒ Object

Parses date as dateTime defined by XML Schema and converts it to a Time object. The format is restricted version of the format defined by ISO 8601.

ArgumentError is raised if date is not compliant with the format or Time class cannot represent specified date.

See #xmlschema for more information on this format.



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# File 'lib/rubysl/time/time.rb', line 379

def xmlschema(date)
  if /\A\s*
      (-?\d+)-(\d\d)-(\d\d)
      T
      (\d\d):(\d\d):(\d\d)
      (\.\d*)?
      (Z|[+-]\d\d:\d\d)?
      \s*\z/ix =~ date
    year = $1.to_i
    mon = $2.to_i
    day = $3.to_i
    hour = $4.to_i
    min = $5.to_i
    sec = $6.to_i
    usec = 0
    usec = ($7[1..-1] + '000000')[0,6].to_i if $7
    if $8
      zone = $8
      year, mon, day, hour, min, sec =
        apply_offset(year, mon, day, hour, min, sec, zone_offset(zone))
      self.utc(year, mon, day, hour, min, sec, usec)
    else
      self.local(year, mon, day, hour, min, sec, usec)
    end
  else
    raise ArgumentError.new("invalid date: #{date.inspect}")
  end
end

.make_time(year, mon, day, hour, min, sec, sec_fraction, zone, now) ⇒ Object 



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# File 'lib/rubysl/time/time.rb', line 151

def make_time(year, mon, day, hour, min, sec, sec_fraction, zone, now)
  usec = nil
  usec = (sec_fraction * 1000000).to_i if sec_fraction
  if now
    begin
      break if year; year = now.year
      break if mon; mon = now.mon
      break if day; day = now.day
      break if hour; hour = now.hour
      break if min; min = now.min
      break if sec; sec = now.sec
      break if sec_fraction; usec = now.tv_usec
    end until true
  end

  year ||= 1970
  mon ||= 1
  day ||= 1
  hour ||= 0
  min ||= 0
  sec ||= 0
  usec ||= 0

  off = nil
  off = zone_offset(zone, year) if zone

  if off
    year, mon, day, hour, min, sec =
      apply_offset(year, mon, day, hour, min, sec, off)
    t = self.utc(year, mon, day, hour, min, sec, usec)
    t.localtime if !zone_utc?(zone)
    t
  else
    self.local(year, mon, day, hour, min, sec, usec)
  end
end

.month_days(y, m) ⇒ Object 



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# File 'lib/rubysl/time/time.rb', line 99

def month_days(y, m)
  if ((y % 4 == 0) && (y % 100 != 0)) || (y % 400 == 0)
    LeapYearMonthDays[m-1]
  else
    CommonYearMonthDays[m-1]
  end
end

.parse(date, now = self.now) ⇒ Object

Parses date using Date._parse and converts it to a Time object.

If a block is given, the year described in date is converted by the block. For example:

Time.parse(...) {|y| y < 100 ? (y >= 69 ? y + 1900 : y + 2000) : y}

If the upper components of the given time are broken or missing, they are supplied with those of now. For the lower components, the minimum values (1 or 0) are assumed if broken or missing. For example:

# Suppose it is "Thu Nov 29 14:33:20 GMT 2001" now and
# your timezone is GMT:
Time.parse("16:30")     #=> Thu Nov 29 16:30:00 GMT 2001
Time.parse("7/23")      #=> Mon Jul 23 00:00:00 GMT 2001
Time.parse("Aug 31")    #=> Fri Aug 31 00:00:00 GMT 2001

Since there are numerous conflicts among locally defined timezone abbreviations all over the world, this method is not made to understand all of them. For example, the abbreviation “CST” is used variously as:

-06:00 in America/Chicago,
-05:00 in America/Havana,
+08:00 in Asia/Harbin,
+09:30 in Australia/Darwin,
+10:30 in Australia/Adelaide,
etc.

Based on the fact, this method only understands the timezone abbreviations described in RFC 822 and the system timezone, in the order named. (i.e. a definition in RFC 822 overrides the system timezone definition.) The system timezone is taken from Time.local(year, 1, 1).zone and Time.local(year, 7, 1).zone. If the extracted timezone abbreviation does not match any of them, it is ignored and the given time is regarded as a local time.

ArgumentError is raised if Date._parse cannot extract information from date or Time class cannot represent specified date.

This method can be used as fail-safe for other parsing methods as:

Time.rfc2822(date) rescue Time.parse(date)
Time.httpdate(date) rescue Time.parse(date)
Time.xmlschema(date) rescue Time.parse(date)

A failure for Time.parse should be checked, though.



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# File 'lib/rubysl/time/time.rb', line 239

def parse(date, now=self.now)
  d = Date._parse(date, false, true)
  year = d.year
  year = yield(year) if year && block_given?
  make_time(year, d.mon, d.mday, d.hour, d.min, d.sec, d.sec_fraction, d.zone, now)
end

.rfc2822(date) ⇒ Object

Parses date as date-time defined by RFC 2822 and converts it to a Time object. The format is identical to the date format defined by RFC 822 and updated by RFC 1123.

ArgumentError is raised if date is not compliant with RFC 2822 or Time class cannot represent specified date.

See #rfc2822 for more information on this format.



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# File 'lib/rubysl/time/time.rb', line 261

def rfc2822(date)
  if /\A\s*
      (?:(?:Mon|Tue|Wed|Thu|Fri|Sat|Sun)\s*,\s*)?
      (\d{1,2})\s+
      (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s+
      (\d{2,})\s+
      (\d{2})\s*
      :\s*(\d{2})\s*
      (?::\s*(\d{2}))?\s+
      ([+-]\d{4}|
       UT|GMT|EST|EDT|CST|CDT|MST|MDT|PST|PDT|[A-IK-Z])/ix =~ date
    # Since RFC 2822 permit comments, the regexp has no right anchor.
    day = $1.to_i
    mon = MonthValue[$2.upcase]
    year = $3.to_i
    hour = $4.to_i
    min = $5.to_i
    sec = $6 ? $6.to_i : 0
    zone = $7

    # following year completion is compliant with RFC 2822.
    year = if year < 50
             2000 + year
           elsif year < 1000
             1900 + year
           else
             year
           end

    year, mon, day, hour, min, sec =
      apply_offset(year, mon, day, hour, min, sec, zone_offset(zone))
    t = self.utc(year, mon, day, hour, min, sec)
    t.localtime if !zone_utc?(zone)
    t
  else
    raise ArgumentError.new("not RFC 2822 compliant date: #{date.inspect}")
  end
end

.rfc822 ⇒ Object

Parses date as date-time defined by RFC 2822 and converts it to a Time object. The format is identical to the date format defined by RFC 822 and updated by RFC 1123.

ArgumentError is raised if date is not compliant with RFC 2822 or Time class cannot represent specified date.

See #rfc2822 for more information on this format.



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# File 'lib/rubysl/time/time.rb', line 299

def rfc2822(date)
  if /\A\s*
      (?:(?:Mon|Tue|Wed|Thu|Fri|Sat|Sun)\s*,\s*)?
      (\d{1,2})\s+
      (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s+
      (\d{2,})\s+
      (\d{2})\s*
      :\s*(\d{2})\s*
      (?::\s*(\d{2}))?\s+
      ([+-]\d{4}|
       UT|GMT|EST|EDT|CST|CDT|MST|MDT|PST|PDT|[A-IK-Z])/ix =~ date
    # Since RFC 2822 permit comments, the regexp has no right anchor.
    day = $1.to_i
    mon = MonthValue[$2.upcase]
    year = $3.to_i
    hour = $4.to_i
    min = $5.to_i
    sec = $6 ? $6.to_i : 0
    zone = $7

    # following year completion is compliant with RFC 2822.
    year = if year < 50
             2000 + year
           elsif year < 1000
             1900 + year
           else
             year
           end

    year, mon, day, hour, min, sec =
      apply_offset(year, mon, day, hour, min, sec, zone_offset(zone))
    t = self.utc(year, mon, day, hour, min, sec)
    t.localtime if !zone_utc?(zone)
    t
  else
    raise ArgumentError.new("not RFC 2822 compliant date: #{date.inspect}")
  end
end

.xmlschema(date) ⇒ Object

Parses date as dateTime defined by XML Schema and converts it to a Time object. The format is restricted version of the format defined by ISO 8601.

ArgumentError is raised if date is not compliant with the format or Time class cannot represent specified date.

See #xmlschema for more information on this format.



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# File 'lib/rubysl/time/time.rb', line 351

def xmlschema(date)
  if /\A\s*
      (-?\d+)-(\d\d)-(\d\d)
      T
      (\d\d):(\d\d):(\d\d)
      (\.\d*)?
      (Z|[+-]\d\d:\d\d)?
      \s*\z/ix =~ date
    year = $1.to_i
    mon = $2.to_i
    day = $3.to_i
    hour = $4.to_i
    min = $5.to_i
    sec = $6.to_i
    usec = 0
    usec = ($7[1..-1] + '000000')[0,6].to_i if $7
    if $8
      zone = $8
      year, mon, day, hour, min, sec =
        apply_offset(year, mon, day, hour, min, sec, zone_offset(zone))
      self.utc(year, mon, day, hour, min, sec, usec)
    else
      self.local(year, mon, day, hour, min, sec, usec)
    end
  else
    raise ArgumentError.new("invalid date: #{date.inspect}")
  end
end

.zone_offset(zone, year = self.now.year) ⇒ Object 



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# File 'lib/rubysl/time/time.rb', line 69

def zone_offset(zone, year=self.now.year)
  off = nil
  zone = zone.upcase
  if /\A([+-])(\d\d):?(\d\d)\z/ =~ zone
    off = ($1 == '-' ? -1 : 1) * ($2.to_i * 60 + $3.to_i) * 60
  elsif /\A[+-]\d\d\z/ =~ zone
    off = zone.to_i * 3600
  elsif ZoneOffset.include?(zone)
    off = ZoneOffset[zone] * 3600
  elsif ((t = self.local(year, 1, 1)).zone.upcase == zone rescue false)
    off = t.utc_offset
  elsif ((t = self.local(year, 7, 1)).zone.upcase == zone rescue false)
    off = t.utc_offset
  end
  off
end

.zone_utc?(zone) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rubysl/time/time.rb', line 86

def zone_utc?(zone)
  # * +0000 means localtime. [RFC 2822]
  # * GMT is a localtime abbreviation in Europe/London, etc.
  if /\A(?:-00:00|-0000|-00|UTC|Z|UT)\z/i =~ zone
    true
  else
    false
  end
end

Instance Method Details

#httpdate ⇒ Object

Returns a string which represents the time as rfc1123-date of HTTP-date defined by RFC 2616: 

day-of-week, DD month-name CCYY hh:mm:ss GMT

Note that the result is always UTC (GMT).



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# File 'lib/rubysl/time/time.rb', line 422

def httpdate
  t = dup.utc
  # sprintf('%s, %02d %s %d %02d:%02d:%02d GMT',
    # RFC2822_DAY_NAME[t.wday],
    # t.day, RFC2822_MONTH_NAME[t.mon-1], t.year,
    # t.hour, t.min, t.sec)

  day = t.day
  if day < 10
    day = "0#{day}"
  else
    day = day.to_s
  end

  hour = t.hour
  if hour < 10
    hour = "0#{hour}"
  else
    hour = hour.to_s
  end

  min = t.min
  if min < 10
    min = "0#{min}"
  else
    min = min.to_s
  end

  sec = t.sec
  if sec < 10
    sec = "0#{sec}"
  else
    sec = sec.to_s
  end

  "#{RFC2822_DAY_NAME[t.wday]}, #{day} #{RFC2822_MONTH_NAME[t.mon-1]} #{t.year} #{hour}:#{min}:#{sec} GMT"
end

#rfc2822 ⇒ Object Also known as: rfc822

Returns a string which represents the time as date-time defined by RFC 2822:

day-of-week, DD month-name CCYY hh:mm:ss zone

where zone is [+-]hhmm.

If self is a UTC time, -0000 is used as zone.



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# File 'lib/rubysl/time/time.rb', line 391

def rfc2822
  sprintf('%s, %02d %s %d %02d:%02d:%02d ',
    RFC2822_DAY_NAME[wday],
    day, RFC2822_MONTH_NAME[mon-1], year,
    hour, min, sec) +
  if utc?
    '-0000'
  else
    off = utc_offset
    sign = off < 0 ? '-' : '+'
    sprintf('%s%02d%02d', sign, *(off.abs / 60).divmod(60))
  end
end

#xmlschema(fraction_digits = 0) ⇒ Object Also known as: iso8601

Returns a string which represents the time as dateTime defined by XML Schema:

CCYY-MM-DDThh:mm:ssTZD
CCYY-MM-DDThh:mm:ss.sssTZD

where TZD is Z or [+-]hh:mm.

If self is a UTC time, Z is used as TZD. [+-]hh:mm is used otherwise.

fractional_seconds specifies a number of digits of fractional seconds. Its default value is 0.



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# File 'lib/rubysl/time/time.rb', line 474

def xmlschema(fraction_digits=0)
  sprintf('%d-%02d-%02dT%02d:%02d:%02d',
    year, mon, day, hour, min, sec) +
  if fraction_digits == 0
    ''
  elsif fraction_digits <= 6
    '.' + sprintf('%06d', usec)[0, fraction_digits]
  else
    '.' + sprintf('%06d', usec) + '0' * (fraction_digits - 6)
  end +
  if utc?
    'Z'
  else
    off = utc_offset
    sign = off < 0 ? '-' : '+'
    sprintf('%s%02d:%02d', sign, *(off.abs / 60).divmod(60))
  end
end