calendar_types() :: Date.t() | DateTime.t() | NaiveDateTime.t() | Time.t()

date() :: {year(), month(), day()}

datetime() :: {date(), time()}

day() :: Calendar.day()

daynum() :: 1..366

hour() :: Calendar.hour()

iso_triplet() :: {year(), weeknum(), weekday()}

megaseconds() :: non_neg_integer()

microsecond() :: Calendar.microsecond()

microsecond_datetime() :: {date(), microsecond_time()}

microsecond_time() ::
  {hour(), minute(), second(), microsecond() | microseconds()}

microseconds() :: non_neg_integer()

minute() :: Calendar.minute()

month() :: Calendar.month()

num_of_days() :: 28..31

second() :: Calendar.second()

seconds() :: non_neg_integer()

shift_units() ::
  :milliseconds | :seconds | :minutes | :hours | :days | :weeks | :years

std_offset() :: Calendar.std_offset()

time() :: {hour(), minute(), second()}

time_units() ::
  :microseconds
  | :milliseconds
  | :seconds
  | :minutes
  | :hours
  | :days
  | :weeks
  | :years

time_zone() :: Calendar.time_zone()

timestamp() :: {megaseconds(), seconds(), microseconds()}

tz_offset() :: -14..12

utc_offset() :: Calendar.utc_offset()

valid_date() :: Date.t() | date()

valid_datetime() ::
  Date.t()
  | DateTime.t()
  | NaiveDateTime.t()
  | Time.t()
  | datetime()
  | date()
  | microsecond_datetime()

valid_time() :: Time.t() | time()

valid_timezone() :: String.t() | tz_offset() | :utc | :local

week_of_month() :: 1..5

weekday() :: 1..7

weekday_name() ::
  :monday | :tuesday | :wednesday | :thursday | :friday | :saturday | :sunday

weeknum() :: 1..53

weekstart() :: weekday() | binary() | atom()

year() :: Calendar.year()

zone_abbr() :: Calendar.zone_abbr()