Module: EthiopianDate

Defined in:
lib/ethiopian_date.rb,
lib/ethiopian_date/version.rb

Defined Under Namespace

Classes: Error

Constant Summary collapse

Nmonths = 
12
MonthDays = 
[0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
AmharicMonths = 
{ '1' => 'መስከረም', '2' => 'ጥቅምት', '3' => 'ህዳር', '4' => 'ታህሳስ', '5' => 'ጥር', '6' => 'የካቲት',
'7' => 'መጋቢት', '8' => 'ሚያዝያ', '9' => 'ግንቦት', '10' => 'ሰኔ', '11' => 'ሐምሌ', '12' => 'ነሃሴ', '13' => 'ጳጉሜ' }
AmharicDays = 
{ :Sunday => 'እሁድ', :Monday => 'ሰኞ', :Tuesday => 'ማክሰኞ', :Wednesday => 'ሮብ', :Thursday => 'ሓሙስ', :Friday => 'ኣርብ', :Saturday => 'ቅዳሜ' }
JD_EPOCH_OFFSET_AMETE_MIHRET =

Ethiopic: Julian date offset

1723856
JD_EPOCH_OFFSET_COPTIC =

Coptic : Julian date offset

1824665
JD_EPOCH_OFFSET_GREGORIAN = 
1721426
JD_EPOCH_OFFSET_AMETE_ALEM =

ዓ/ዓ

-285019 # ዓ/ዓ
VERSION = 
"2.3.1"

Instance Method Summary collapse

Instance Method Details

#ethiopic_date_format(ethiopic_date) ⇒ Object

Date format for Ethiopic date

Examples:

ethiopic_date_format('2004-5-21') will be ጥር 21 ቀን 2004ዓ/ም

Returns:

  • a formated Ethiopic date string



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# File 'lib/ethiopian_date.rb', line 86

def ethiopic_date_format(ethiopic_date)
  d = ethiopic_date.split('-')
  year = d[0]
  month = d[1]
  day = d[2]
  day = day.to_s.length < 2 ? '0' << day.to_s : day
  return "#{AmharicMonths[month.to_s]} #{day}, #{year}"
end

#fromEthiopicToGregorian(year, month, day) ⇒ Object

Changes from in_date:EthiopicDate to GregorianDate

Examples:

fromEthiopicToGregorian(2004,5,21)

Parameters:

  • in_date —

    always must be year,month, day in that order

Returns:

  • GregorianDate is returned



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# File 'lib/ethiopian_date.rb', line 36

def fromEthiopicToGregorian(year, month, day)
  #TODO : Handle Exceptions when there is a wrong input
  year = year
  month = month
  day = day
  if (year <= 0)
    era = JD_EPOCH_OFFSET_AMETE_ALEM
  else
    era = JD_EPOCH_OFFSET_AMETE_MIHRET
  end
  jdn = jdn_from_ethiopic(year, month, day, era)
  return gregorian_from_jdn(jdn)
end

#fromGregorianToEthiopic(year, month, day) ⇒ Object

Changes from in_date:GregorianDate to EthiopicDate

Examples:

fromEthiopicToGregorian(2012,5,21)

Parameters:

  • year,month,day —

    in that order

Returns:

  • EthiopicDate is returned



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# File 'lib/ethiopian_date.rb', line 65

def fromGregorianToEthiopic(year, month, day)
  jdn = jdn_from_gregorian(year, month, day)
  if jdn >= JD_EPOCH_OFFSET_AMETE_MIHRET + 365
    era = JD_EPOCH_OFFSET_AMETE_MIHRET
  else
    era = JD_EPOCH_OFFSET_AMETE_ALEM
  end
  r = (jdn - era).modulo(1461)
  n = (r.modulo(365)) + (365 * (r / 1460))
  eyear = 4 * ((jdn - era) / 1461) + r / 365 - r / 1460
  emonth = (n / 30) + 1
  eday = (n.modulo(30)) + 1

  return "#{eyear}-#{emonth}-#{eday}"
end

#to_gregorian(d) ⇒ Object

Examples:

to_gregorian('19/12/1989')



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# File 'lib/ethiopian_date.rb', line 50

def to_gregorian(d)
  #dt=d.to_s(:db)
  if d.present?
    a = d.to_s.split("/")
    return fromEthiopicToGregorian(a[2].to_i, a[1].to_i, a[0].to_i)
  else
    return nil
  end
end