Specs

add_days(fixed() | coptic_date(), integer(), :fixed | :date) ::
  fixed() | coptic_date()

Adds the number of days to a fixed day or Coptic date.

If days is negative, the days will be subtracted.

The type parameter determines the type of the returned value:

• :fixed returns a fixed day (default),
• :date returns a Coptic date.

Examples

  iex>Elixir.Coptic.add_days(730739, 100)
  730839
  iex>Elixir.Coptic.add_days(730739, -100)
  730639

  iex>Elixir.Coptic.add_days(730739, 100, :fixed)
  730839
  iex>Elixir.Coptic.add_days(730739, -100, :fixed)
  730639

  iex>Elixir.Coptic.add_days(730739, 100, :date)
  {1718, 4, 11}
  iex>Elixir.Coptic.add_days(730739, -100, :date)
  {1717, 9, 26}

  iex>Elixir.Coptic.add_days({1718, 1, 1}, 100)
  730839
  iex>Elixir.Coptic.add_days({1718, 1, 1}, -100)
  730639

  iex>Elixir.Coptic.add_days({1718, 1, 1}, 100, :fixed)
  730839
  iex>Elixir.Coptic.add_days({1718, 1, 1}, -100, :fixed)
  730639

  iex>Elixir.Coptic.add_days({1718, 1, 1}, 100, :date)
  {1718, 4, 11}
  iex>Elixir.Coptic.add_days({1718, 1, 1}, -100, :date)
  {1717, 9, 26}

Specs

as_date(fixed() | coptic_date()) :: coptic_date()

Returns a fixed day or Coptic date as a Coptic date.

This is a convenience function to simplify certain function calls.

Examples

  iex>Elixir.Coptic.as_date(730739)
  {1718, 1, 1}
  iex>Elixir.Coptic.as_date({1718, 1, 1})
  {1718, 1, 1}

Specs

as_fixed(fixed() | coptic_date()) :: fixed()

Returns a fixed day or Coptic date as a fixed day.

This is a convenience function to simplify certain function calls.

Examples

  iex>Elixir.Coptic.as_fixed(730739)
  730739
  iex>Elixir.Coptic.as_fixed({1718, 1, 1})
  730739

Specs

as_type(fixed() | coptic_date(), :fixed | :date) :: fixed() | coptic_date()

Returns a fixed day or Coptic date either as a fixed day or a Coptic date.

The type parameter determines the type of the returned value:

• :fixed returns a fixed day (default),
• :date returns a Coptic date.

Examples

  iex>Elixir.Coptic.as_type(730739)
  730739
  iex>Elixir.Coptic.as_type(730739, :fixed)
  730739
  iex>Elixir.Coptic.as_type(730739, :date)
  {1718, 1, 1}
  iex>Elixir.Coptic.as_type({1718, 1, 1})
  730739
  iex>Elixir.Coptic.as_type({1718, 1, 1}, :fixed)
  730739
  iex>Elixir.Coptic.as_type({1718, 1, 1}, :date)
  {1718, 1, 1}

Specs

compare(coptic_date(), coptic_date()) :: :lt | :eq | :gt

Compares two Coptic dates and returns...

• :lt if date1 is smaller (= earlier) than date2,
• :eq if date1 is equal date2,
• :gt if date1 is larger (= later) than date2.

Examples

  iex>Elixir.Coptic.compare({1718, 1, 1}, {1718, 1, 1})
  :eq
  iex>Elixir.Coptic.compare({1718, 1, 1}, {1718, 4, 11})
  :lt
  iex>Elixir.Coptic.compare({1718, 4, 11}, {1718, 1, 1})
  :gt

Specs

coptic_christmas(Gregorian.gregorian_year()) :: fixed() | coptic_date()

Returns the fixed date of Coptic Christmas of the Coptic calendar in the given gregorian_year or [], if there is no such holiday in that year.

The type parameter determines the type of the returned value:

• :fixed returns a fixed day (default),
• :date returns a Coptic date.

Example

  iex>Elixir.Coptic.coptic_christmas(2001)
  {2001, 1, 7}

Specs

date(coptic_year(), coptic_month(), coptic_day()) :: t()

Returns a Coptic date from its fields year, month, day.

Example

  iex>Elixir.Coptic.date(1718, 1, 1)
  {1718, 1, 1}

Specs

date_diff(fixed() | coptic_date(), fixed() | coptic_date()) :: integer()

Returns the difference (= number of days) between two Coptic dates.

The dates can be given as fixed days or Coptic dates in arbitrary combination. The difference is calculated by date2 - date1.

If cal_date2 is larger (= later) than cal_date1 the result is positive.

If cal_date2 is smaller (= earlier) than cal_date1 the result is negative.

Examples

  iex>Elixir.Coptic.date_diff(730739, 730839)
  100
  iex>Elixir.Coptic.date_diff(730839, 730739)
  -100
  iex>Elixir.Coptic.date_diff({1718, 1, 1}, {1718, 4, 11})
  100
  iex>Elixir.Coptic.date_diff({1718, 4, 11}, {1718, 1, 1})
  -100
  iex>Elixir.Coptic.date_diff(730739, {1718, 4, 11})
  100
  iex>Elixir.Coptic.date_diff({1718, 1, 1}, 730839)
  100

Specs

day(fixed() | coptic_date(), :atom | :index | :name | :value) ::
  :atom | integer() | String.t() | number()

Returns the day field of a Coptic date.

The type parameter determines the type of the returned day:

• :atom returns the internal name of day,
• :index returns the position of the day field within the date,
• :name returns the common name of the day,
• :value returns the value of the day (default).

Examples

  iex>Elixir.Coptic.day(730739)
  1
  iex>Elixir.Coptic.day(730739, :atom)
  :day
  iex>Elixir.Coptic.day(730739, :index)
  2
  iex>Elixir.Coptic.day(730739, :name)
  "Day"
  iex>Elixir.Coptic.day(730739, :value)
  1

  iex>Elixir.Coptic.day({1718, 1, 1})
  1
  iex>Elixir.Coptic.day({1718, 1, 1}, :atom)
  :day
  iex>Elixir.Coptic.day({1718, 1, 1}, :index)
  2
  iex>Elixir.Coptic.day({1718, 1, 1}, :name)
  "Day"
  iex>Elixir.Coptic.day({1718, 1, 1}, :value)
  1

Specs

epoch() :: number()

Returns the epoch of the Coptic calendar.

Example

  iex>Elixir.Coptic.epoch()
  103605

Specs

eq(coptic_date(), coptic_date()) :: boolean()

Returns true if Coptic date1 is equal Coptic date2, otherwise false.

Examples

  iex>Elixir.Coptic.eq({1718, 1, 1}, {1718, 1, 1})
  true
  iex>Elixir.Coptic.eq({1718, 1, 1}, {1718, 4, 11})
  false
  iex>Elixir.Coptic.eq({1718, 4, 11}, {1718, 1, 1})
  false

Specs

field_atom(integer()) :: atom()

Returns the name of the field atom in a Coptic date at field_index.

Examples

  iex>Elixir.Coptic.field_atom(0)
  :year
  iex>Elixir.Coptic.field_atom(1)
  :month
  iex>Elixir.Coptic.field_atom(2)
  :day

Specs

field_atoms() :: [atom()]

Returns a list of the field atoms (names) of a Coptic date.

Example

  iex>Elixir.Coptic.field_atoms()
  [:year, :month, :day]

Specs

field_count() :: integer()

Returns the number of fields in a Coptic date

Example

  iex>Elixir.Coptic.field_count()
  3

Specs

field_index(atom()) :: integer()

Returns the index (= position) of the field_atom in a Coptic date.

Examples

  iex>Elixir.Coptic.field_index(:year)
  0
  iex>Elixir.Coptic.field_index(:month)
  1
  iex>Elixir.Coptic.field_index(:day)
  2

Specs

from_date(tuple(), module()) :: coptic_date()

from_date(tuple(), module()) :: {:error, String.t()}

Converts the other_date of the other_calendar into the equivalent date of the Coptic calendar.

Example

  iex>Elixir.Coptic.from_date({2001, 9, 11}, Gregorian)
  {1718, 1, 1}

Specs

from_fixed(fixed()) :: coptic_date()

Converts a fixed day to a Coptic date.

Example

  iex>Elixir.Coptic.from_fixed(730739)
  {1718, 1, 1}

Specs

from_jd(tuple() | number()) :: coptic_date()

Converts a Julian Day into the equivalent Coptic date.

The Julian Day can be given as a tuple or by a Julian day.

Examples

  iex>Elixir.Coptic.from_jd({2452163.5})
  {1718, 1, 1}
  iex>Elixir.Coptic.from_jd(2452163.5)
  {1718, 1, 1}

Specs

from_rata_die(tuple() | integer()) :: coptic_date()

Converts a RataDie date into the equivalent Coptic date.

The RataDie date can be given as a tuple or by a RataDie rd.

Examples

  iex>Elixir.Coptic.from_rata_die({730739})
  {1718, 1, 1}
  iex>Elixir.Coptic.from_rata_die(730739)
  {1718, 1, 1}

Specs

from_unix(tuple() | integer()) :: coptic_date()

Converts a Unix date into the equivalent Coptic date.

The Unix date can be given as a tuple or by Unix seconds.

Examples

  iex>Elixir.Coptic.from_unix({1000166400})
  {1718, 1, 1}
  iex>Elixir.Coptic.from_unix(1000166400)
  {1718, 1, 1}

Specs

ge(coptic_date(), coptic_date()) :: boolean()

Returns true if Coptic date1 is greater (= later) than or equal Coptic date2, otherwise false.

Examples

  iex>Elixir.Coptic.ge({1718, 1, 1}, {1718, 1, 1})
  true
  iex>Elixir.Coptic.ge({1718, 1, 1}, {1718, 4, 11})
  false
  iex>Elixir.Coptic.ge({1718, 4, 11}, {1718, 1, 1})
  true

Specs

gt(coptic_date(), coptic_date()) :: boolean()

Returns true if Coptic date1 is greater (= later) than Coptic date2, otherwise false.

Examples

  iex>Elixir.Coptic.gt({1718, 1, 1}, {1718, 1, 1})
  false
  iex>Elixir.Coptic.gt({1718, 1, 1}, {1718, 4, 11})
  false
  iex>Elixir.Coptic.gt({1718, 4, 11}, {1718, 1, 1})
  true

Returns a list of the holidays of the Coptic calendar.

The type parameter determines the type of the returned holidays:

• :atom returns the internal names of the holidays,
• :name returns the common names of the holidays (default).

Examples

  iex>Elixir.Coptic.holidays()
  ["Coptic Christmas"]
  iex>Elixir.Coptic.holidays(:atom)
  [:coptic_christmas]
  iex>Elixir.Coptic.holidays(:name)
  ["Coptic Christmas"]

Specs

keyword() :: atom()

Returns the internal keyword of the Coptic calendar.

Example

  iex>Elixir.Coptic.keyword()
  :coptic

Specs

le(coptic_date(), coptic_date()) :: boolean()

Returns true if Coptic date1 is smaller (= earlier) than or equal Coptic date2, otherwise false.

Examples

  iex>Elixir.Coptic.le({1718, 1, 1}, {1718, 1, 1})
  true
  iex>Elixir.Coptic.le({1718, 1, 1}, {1718, 4, 11})
  true
  iex>Elixir.Coptic.le({1718, 4, 11}, {1718, 1, 1})
  false

Specs

lt(coptic_date(), coptic_date()) :: boolean()

Returns true if Coptic date1 is smaller (= earlier) than Coptic date2, otherwise false.

Examples

  iex>Elixir.Coptic.lt({1718, 1, 1}, {1718, 1, 1})
  false
  iex>Elixir.Coptic.lt({1718, 1, 1}, {1718, 4, 11})
  true
  iex>Elixir.Coptic.lt({1718, 4, 11}, {1718, 1, 1})
  false

Specs

module() :: module()

Returns the module of the Coptic calendar.

Example

  iex>Elixir.Coptic.module()
  Coptic

Specs

month(fixed() | coptic_date(), :atom | :index | :name | :value) ::
  :atom | integer() | String.t() | number()

Returns the month field of a Coptic date.

The type parameter determines the type of the returned month:

• :atom returns the internal name of month,
• :index returns the position of the month field within the date,
• :name returns the common name of the month,
• :value returns the value of the month (default).

Examples

  iex>Elixir.Coptic.month(730739)
  1
  iex>Elixir.Coptic.month(730739, :atom)
  :month
  iex>Elixir.Coptic.month(730739, :index)
  1
  iex>Elixir.Coptic.month(730739, :name)
  "Month"
  iex>Elixir.Coptic.month(730739, :value)
  1

  iex>Elixir.Coptic.month({1718, 1, 1})
  1
  iex>Elixir.Coptic.month({1718, 1, 1}, :atom)
  :month
  iex>Elixir.Coptic.month({1718, 1, 1}, :index)
  1
  iex>Elixir.Coptic.month({1718, 1, 1}, :name)
  "Month"
  iex>Elixir.Coptic.month({1718, 1, 1}, :value)
  1

Specs

name() :: atom()

Returns the internal name of the Coptic calendar.

Example

  iex>Elixir.Coptic.name()
  "Coptic"

Specs

range(coptic_date(), coptic_date()) :: integer()

Returns the distance between two Coptic dates as a range of fixed days.

Example

  iex>Elixir.Coptic.range({1718, 1, 1}, {1718, 4, 11})
  730739..730839

Specs

start_of_day() :: :midnight | :sunset | :sunrise | :noon

Returns the start of the day in the Coptic calendar.

Possible return values are:

• :midnight,
• :noon,
• :sunrise,
• :sunset,

Example

  iex>Elixir.Coptic.start_of_day()
  :midnight

Specs

to_date(coptic_date(), module()) :: tuple()

Converts a Coptic date into the equivalent date of the other_calendar.

For the following example to work the Gregorian calendar must be available.

Example

  iex>Elixir.Coptic.to_date({1718, 1, 1}, Gregorian)
  {2001, 9, 11}

Specs

to_fixed(coptic_date()) :: fixed()

Converts a Coptic date tuple into a fixed day.

Example

  iex>Elixir.Coptic.to_fixed({1718, 1, 1})
  730739

Specs

to_fixed(coptic_year(), coptic_month(), coptic_day()) :: fixed()

Converts a Coptic date given by year, month, day into a fixed day.

Example

  iex>Elixir.Coptic.to_fixed(1718, 1, 1)
  730739

Specs

to_jd(coptic_date()) :: {number()}

Converts a Coptic date into the equivalent Julian Day.

Example

  iex>Elixir.Coptic.to_jd({1718, 1, 1})
  {2452163.5}

Specs

to_jd(coptic_year(), coptic_month(), coptic_day()) :: {number()}

Converts a Coptic date given by year, month, day into the equivalent Julian Day.

Example

  iex>Elixir.Coptic.to_jd(1718, 1, 1)
  {2452163.5}

Specs

to_rata_die(coptic_date()) :: {integer()}

Converts a Coptic date into the equivalent RataDie date.

Example

  iex>Elixir.Coptic.to_rata_die({1718, 1, 1})
  {730739}

Specs

to_rata_die(coptic_year(), coptic_month(), coptic_day()) :: {integer()}

Converts a Coptic date given by year, month, day into the equivalent RataDie date.

Example

  iex>Elixir.Coptic.to_rata_die(1718, 1, 1)
  {730739}

Specs

to_unix(coptic_date()) :: {integer()}

Converts a Coptic date into the equivalent Unix date.

Example

  iex>Elixir.Coptic.to_unix({1718, 1, 1})
  {1000166400}

Specs

to_unix(coptic_year(), coptic_month(), coptic_day()) :: {integer()}

Converts a Coptic date given by year, month, day into the equivalent Unix date.

Example

  iex>Elixir.Coptic.to_unix(1718, 1, 1)
  {1000166400}

Specs

today(:fixed | :date) :: fixed() | coptic_date()

Returns the current date either as a fixed day or a Coptic date.

(This cannot be doctested, because today is a moving target.)

The type parameter determines the type of the returned value:

• :fixed returns a fixed day (default),
• :date returns a Coptic date.

Examples

  Elixir.Coptic.today()
  730739
  Elixir.Coptic.today(:fixed)
  730739
  Elixir.Coptic.today(:date)
  {1718, 1, 1}

Specs

year(fixed() | coptic_date(), :atom | :index | :name | :value) ::
  :atom | integer() | String.t() | number()

Returns the year field of a Coptic date.

The type parameter determines the type of the returned year:

• :atom returns the internal name of year,
• :index returns the position of the year field within the date,
• :name returns the common name of the year,
• :value returns the value of the year (default).

Examples

  iex>Elixir.Coptic.year(730739)
  1718
  iex>Elixir.Coptic.year(730739, :atom)
  :year
  iex>Elixir.Coptic.year(730739, :index)
  0
  iex>Elixir.Coptic.year(730739, :name)
  "Year"
  iex>Elixir.Coptic.year(730739, :value)
  1718

  iex>Elixir.Coptic.year({1718, 1, 1})
  1718
  iex>Elixir.Coptic.year({1718, 1, 1}, :atom)
  :year
  iex>Elixir.Coptic.year({1718, 1, 1}, :index)
  0
  iex>Elixir.Coptic.year({1718, 1, 1}, :name)
  "Year"
  iex>Elixir.Coptic.year({1718, 1, 1}, :value)
  1718