View Source Calendar.ISO (Elixir v1.10.0)
A calendar implementation that follows to ISO 8601.
This calendar implements the proleptic Gregorian calendar and is therefore compatible with the calendar used in most countries today. The proleptic means the Gregorian rules for leap years are applied for all time, consequently the dates give different results before the year 1583 from when the Gregorian calendar was adopted.
Note that while ISO 8601 allows times and datetimes to specify 24:00:00 as the zero hour of the next day, this notation is not supported by Elixir.
Link to this section Summary
Types
"Before the Current Era" or "Before the Common Era" (BCE), for those years less than 1.
The "Current Era" or the "Common Era" (CE) which starts in year 1.
Integer that represents the day of the week, where 1 is Monday and 7 is Sunday.
The calendar era.
Microseconds with stored precision.
Functions
Converts the given date into a string.
Converts the datetime (with time zone) into a string.
Calculates the day and era from the given year, month, and day.
Calculates the day of the week from the given year, month, and day.
Calculates the day of the year from the given year, month, and day.
See Calendar.day_rollover_relative_to_midnight_utc/0 for documentation.
Returns how many days there are in the given year-month.
Returns if the given year is a leap year.
Returns how many months there are in the given year.
Converts the Calendar.iso_days/0 format to the datetime format specified by this calendar.
Returns the Calendar.iso_days/0 format of the specified date.
Converts the datetime (without time zone) into a string.
Parses a date string.
Parses a naive datetime string.
Parses a time string.
Parses a UTC datetime string.
Calculates the quarter of the year from the given year, month, and day.
Converts a day fraction to this Calendar's representation of time.
Returns the normalized day fraction of the specified time.
Converts the given time into a string.
Determines if the date given is valid according to the proleptic Gregorian calendar.
Determines if the date given is valid according to the proleptic Gregorian calendar.
Calculates the year and era from the given year.
Link to this section Types
@type bce() :: 0
"Before the Current Era" or "Before the Common Era" (BCE), for those years less than 1.
@type ce() :: 1
The "Current Era" or the "Common Era" (CE) which starts in year 1.
@type day() :: 1..31
@type day_of_week() :: 1..7
Integer that represents the day of the week, where 1 is Monday and 7 is Sunday.
@type day_of_year() :: 1..366
The calendar era.
The ISO calendar has two eras:
@type hour() :: 0..23
@type microsecond() :: {0..999_999, 0..6}
Microseconds with stored precision.
The precision represents the number of digits that must be used when representing the microseconds to external format. If the precision is 0, it means microseconds must be skipped.
@type minute() :: 0..59
@type month() :: 1..12
@type quarter_of_year() :: 1..4
@type second() :: 0..59
@type year() :: -9999..9999
@type year_of_era() :: {1..10000, era()}
Link to this section Functions
date_to_string(year, month, day, format \\ :extended)
View Source (since 1.4.0)Converts the given date into a string.
By default, returns dates formatted in the "extended" format,
for human readability. It also supports the "basic" format
by passing the :basic option.
Examples
iex> Calendar.ISO.date_to_string(2015, 2, 28)
"2015-02-28"
iex> Calendar.ISO.date_to_string(2017, 8, 1)
"2017-08-01"
iex> Calendar.ISO.date_to_string(-99, 1, 31)
"-0099-01-31"
iex> Calendar.ISO.date_to_string(2015, 2, 28, :basic)
"20150228"
iex> Calendar.ISO.date_to_string(-99, 1, 31, :basic)
"-00990131"datetime_to_string(year, month, day, hour, minute, second, microsecond, time_zone, zone_abbr, utc_offset, std_offset, format \\ :extended)
View Source (since 1.4.0)@spec datetime_to_string( year(), month(), day(), Calendar.hour(), Calendar.minute(), Calendar.second(), Calendar.microsecond(), Calendar.time_zone(), Calendar.zone_abbr(), Calendar.utc_offset(), Calendar.std_offset(), :basic | :extended ) :: String.t()
Converts the datetime (with time zone) into a string.
By default, returns datetimes formatted in the "extended" format,
for human readability. It also supports the "basic" format
by passing the :basic option.
Examples
iex> time_zone = "Etc/UTC"
iex> Calendar.ISO.datetime_to_string(2017, 8, 1, 1, 2, 3, {4, 5}, time_zone, "UTC", 0, 0)
"2017-08-01 01:02:03.00000Z"
iex> Calendar.ISO.datetime_to_string(2017, 8, 1, 1, 2, 3, {4, 5}, time_zone, "UTC", 3600, 0)
"2017-08-01 01:02:03.00000+01:00"
iex> Calendar.ISO.datetime_to_string(2017, 8, 1, 1, 2, 3, {4, 5}, time_zone, "UTC", 3600, 3600)
"2017-08-01 01:02:03.00000+02:00"
iex> time_zone = "Europe/Berlin"
iex> Calendar.ISO.datetime_to_string(2017, 8, 1, 1, 2, 3, {4, 5}, time_zone, "CET", 3600, 0)
"2017-08-01 01:02:03.00000+01:00 CET Europe/Berlin"
iex> Calendar.ISO.datetime_to_string(2017, 8, 1, 1, 2, 3, {4, 5}, time_zone, "CDT", 3600, 3600)
"2017-08-01 01:02:03.00000+02:00 CDT Europe/Berlin"
iex> time_zone = "America/Los_Angeles"
iex> Calendar.ISO.datetime_to_string(2015, 2, 28, 1, 2, 3, {4, 5}, time_zone, "PST", -28800, 0)
"2015-02-28 01:02:03.00000-08:00 PST America/Los_Angeles"
iex> Calendar.ISO.datetime_to_string(2015, 2, 28, 1, 2, 3, {4, 5}, time_zone, "PDT", -28800, 3600)
"2015-02-28 01:02:03.00000-07:00 PDT America/Los_Angeles"
iex> time_zone = "Europe/Berlin"
iex> Calendar.ISO.datetime_to_string(2017, 8, 1, 1, 2, 3, {4, 5}, time_zone, "CET", 3600, 0, :basic)
"20170801 010203.00000+0100 CET Europe/Berlin"@spec day_of_era(year(), month(), day()) :: Calendar.day_of_era()
Calculates the day and era from the given year, month, and day.
Examples
iex> Calendar.ISO.day_of_era(0, 1, 1)
{366, 0}
iex> Calendar.ISO.day_of_era(1, 1, 1)
{1, 1}
iex> Calendar.ISO.day_of_era(0, 12, 31)
{1, 0}
iex> Calendar.ISO.day_of_era(0, 12, 30)
{2, 0}
iex> Calendar.ISO.day_of_era(-1, 12, 31)
{367, 0}@spec day_of_week(year(), month(), day()) :: day_of_week()
Calculates the day of the week from the given year, month, and day.
It is an integer from 1 to 7, where 1 is Monday and 7 is Sunday.
Examples
iex> Calendar.ISO.day_of_week(2016, 10, 31)
1
iex> Calendar.ISO.day_of_week(2016, 11, 1)
2
iex> Calendar.ISO.day_of_week(2016, 11, 2)
3
iex> Calendar.ISO.day_of_week(2016, 11, 3)
4
iex> Calendar.ISO.day_of_week(2016, 11, 4)
5
iex> Calendar.ISO.day_of_week(2016, 11, 5)
6
iex> Calendar.ISO.day_of_week(2016, 11, 6)
7
iex> Calendar.ISO.day_of_week(-99, 1, 31)
4@spec day_of_year(year(), month(), day()) :: day_of_year()
Calculates the day of the year from the given year, month, and day.
It is an integer from 1 to 366.
Examples
iex> Calendar.ISO.day_of_year(2016, 1, 31)
31
iex> Calendar.ISO.day_of_year(-99, 2, 1)
32
iex> Calendar.ISO.day_of_year(2018, 2, 28)
59@spec day_rollover_relative_to_midnight_utc() :: {0, 1}
See Calendar.day_rollover_relative_to_midnight_utc/0 for documentation.
Returns how many days there are in the given year-month.
Examples
iex> Calendar.ISO.days_in_month(1900, 1)
31
iex> Calendar.ISO.days_in_month(1900, 2)
28
iex> Calendar.ISO.days_in_month(2000, 2)
29
iex> Calendar.ISO.days_in_month(2001, 2)
28
iex> Calendar.ISO.days_in_month(2004, 2)
29
iex> Calendar.ISO.days_in_month(2004, 4)
30
iex> Calendar.ISO.days_in_month(-1, 5)
31Returns if the given year is a leap year.
Examples
iex> Calendar.ISO.leap_year?(2000)
true
iex> Calendar.ISO.leap_year?(2001)
false
iex> Calendar.ISO.leap_year?(2004)
true
iex> Calendar.ISO.leap_year?(1900)
false
iex> Calendar.ISO.leap_year?(-4)
true@spec months_in_year(year()) :: 12
Returns how many months there are in the given year.
Example
iex> Calendar.ISO.months_in_year(2004)
12@spec naive_datetime_from_iso_days(Calendar.iso_days()) :: {Calendar.year(), Calendar.month(), Calendar.day(), Calendar.hour(), Calendar.minute(), Calendar.second(), Calendar.microsecond()}
Converts the Calendar.iso_days/0 format to the datetime format specified by this calendar.
Examples
iex> Calendar.ISO.naive_datetime_from_iso_days({0, {0, 86400}})
{0, 1, 1, 0, 0, 0, {0, 6}}
iex> Calendar.ISO.naive_datetime_from_iso_days({730_485, {0, 86400}})
{2000, 1, 1, 0, 0, 0, {0, 6}}
iex> Calendar.ISO.naive_datetime_from_iso_days({730_485, {43200, 86400}})
{2000, 1, 1, 12, 0, 0, {0, 6}}
iex> Calendar.ISO.naive_datetime_from_iso_days({-365, {0, 86400000000}})
{-1, 1, 1, 0, 0, 0, {0, 6}}naive_datetime_to_iso_days(year, month, day, hour, minute, second, microsecond)
View Source (since 1.5.0)@spec naive_datetime_to_iso_days( Calendar.year(), Calendar.month(), Calendar.day(), Calendar.hour(), Calendar.minute(), Calendar.second(), Calendar.microsecond() ) :: Calendar.iso_days()
Returns the Calendar.iso_days/0 format of the specified date.
Examples
iex> Calendar.ISO.naive_datetime_to_iso_days(0, 1, 1, 0, 0, 0, {0, 6})
{0, {0, 86400000000}}
iex> Calendar.ISO.naive_datetime_to_iso_days(2000, 1, 1, 12, 0, 0, {0, 6})
{730485, {43200000000, 86400000000}}
iex> Calendar.ISO.naive_datetime_to_iso_days(2000, 1, 1, 13, 0, 0, {0, 6})
{730485, {46800000000, 86400000000}}
iex> Calendar.ISO.naive_datetime_to_iso_days(-1, 1, 1, 0, 0, 0, {0, 6})
{-365, {0, 86400000000}}naive_datetime_to_string(year, month, day, hour, minute, second, microsecond, format \\ :extended)
View Source (since 1.4.0)@spec naive_datetime_to_string( year(), month(), day(), Calendar.hour(), Calendar.minute(), Calendar.second(), Calendar.microsecond(), :basic | :extended ) :: String.t()
Converts the datetime (without time zone) into a string.
By default, returns datetimes formatted in the "extended" format,
for human readability. It also supports the "basic" format
by passing the :basic option.
Examples
iex> Calendar.ISO.naive_datetime_to_string(2015, 2, 28, 1, 2, 3, {4, 6})
"2015-02-28 01:02:03.000004"
iex> Calendar.ISO.naive_datetime_to_string(2017, 8, 1, 1, 2, 3, {4, 5})
"2017-08-01 01:02:03.00000"
iex> Calendar.ISO.naive_datetime_to_string(2015, 2, 28, 1, 2, 3, {4, 6}, :basic)
"20150228 010203.000004"Parses a date string.
Examples
iex> Calendar.ISO.parse_date("2015-01-23")
{:ok, {2015, 1, 23}}
iex> Calendar.ISO.parse_date("-2015-01-23")
{:ok, {-2015, 1, 23}}
iex> Calendar.ISO.parse_date("2015:01:23")
{:error, :invalid_format}
iex> Calendar.ISO.parse_date("2015-01-32")
{:error, :invalid_date}Parses a naive datetime string.
Examples
iex> Calendar.ISO.parse_naive_datetime("2015-01-23 23:50:07")
{:ok, {2015, 1, 23, 23, 50, 7, {0, 0}}}
iex> Calendar.ISO.parse_naive_datetime("2015-01-23T23:50:07")
{:ok, {2015, 1, 23, 23, 50, 7, {0, 0}}}
iex> Calendar.ISO.parse_naive_datetime("2015-01-23T23:50:07Z")
{:ok, {2015, 1, 23, 23, 50, 7, {0, 0}}}
iex> Calendar.ISO.parse_naive_datetime("2015-01-23 23:50:07.0")
{:ok, {2015, 1, 23, 23, 50, 7, {0, 1}}}
iex> Calendar.ISO.parse_naive_datetime("2015-01-23 23:50:07,0123456")
{:ok, {2015, 1, 23, 23, 50, 7, {12345, 6}}}
iex> Calendar.ISO.parse_naive_datetime("2015-01-23 23:50:07.0123456")
{:ok, {2015, 1, 23, 23, 50, 7, {12345, 6}}}
iex> Calendar.ISO.parse_naive_datetime("2015-01-23T23:50:07.123Z")
{:ok, {2015, 1, 23, 23, 50, 7, {123000, 3}}}
iex> Calendar.ISO.parse_naive_datetime("2015-01-23P23:50:07")
{:error, :invalid_format}
iex> Calendar.ISO.parse_naive_datetime("2015:01:23 23-50-07")
{:error, :invalid_format}
iex> Calendar.ISO.parse_naive_datetime("2015-01-23 23:50:07A")
{:error, :invalid_format}
iex> Calendar.ISO.parse_naive_datetime("2015-01-23 23:50:61")
{:error, :invalid_time}
iex> Calendar.ISO.parse_naive_datetime("2015-01-32 23:50:07")
{:error, :invalid_date}
iex> Calendar.ISO.parse_naive_datetime("2015-01-23T23:50:07.123+02:30")
{:ok, {2015, 1, 23, 23, 50, 7, {123000, 3}}}
iex> Calendar.ISO.parse_naive_datetime("2015-01-23T23:50:07.123+00:00")
{:ok, {2015, 1, 23, 23, 50, 7, {123000, 3}}}
iex> Calendar.ISO.parse_naive_datetime("2015-01-23T23:50:07.123-02:30")
{:ok, {2015, 1, 23, 23, 50, 7, {123000, 3}}}
iex> Calendar.ISO.parse_naive_datetime("2015-01-23T23:50:07.123-00:00")
{:error, :invalid_format}
iex> Calendar.ISO.parse_naive_datetime("2015-01-23T23:50:07.123-00:60")
{:error, :invalid_format}
iex> Calendar.ISO.parse_naive_datetime("2015-01-23T23:50:07.123-24:00")
{:error, :invalid_format}Parses a time string.
Examples
iex> Calendar.ISO.parse_time("23:50:07")
{:ok, {23, 50, 7, {0, 0}}}
iex> Calendar.ISO.parse_time("23:50:07Z")
{:ok, {23, 50, 7, {0, 0}}}
iex> Calendar.ISO.parse_time("T23:50:07Z")
{:ok, {23, 50, 7, {0, 0}}}
iex> Calendar.ISO.parse_time("23:50:07,0123456")
{:ok, {23, 50, 7, {12345, 6}}}
iex> Calendar.ISO.parse_time("23:50:07.0123456")
{:ok, {23, 50, 7, {12345, 6}}}
iex> Calendar.ISO.parse_time("23:50:07.123Z")
{:ok, {23, 50, 7, {123000, 3}}}
iex> Calendar.ISO.parse_time("2015:01:23 23-50-07")
{:error, :invalid_format}
iex> Calendar.ISO.parse_time("23:50:07A")
{:error, :invalid_format}
iex> Calendar.ISO.parse_time("23:50:07.")
{:error, :invalid_format}
iex> Calendar.ISO.parse_time("23:50:61")
{:error, :invalid_time}Parses a UTC datetime string.
Examples
iex> Calendar.ISO.parse_utc_datetime("2015-01-23T23:50:07Z")
{:ok, {2015, 1, 23, 23, 50, 7, {0, 0}}, 0}
iex> Calendar.ISO.parse_utc_datetime("2015-01-23T23:50:07.123+02:30")
{:ok, {2015, 1, 23, 21, 20, 7, {123000, 3}}, 9000}
iex> Calendar.ISO.parse_utc_datetime("2015-01-23T23:50:07,123+02:30")
{:ok, {2015, 1, 23, 21, 20, 7, {123000, 3}}, 9000}
iex> Calendar.ISO.parse_utc_datetime("-2015-01-23T23:50:07Z")
{:ok, {-2015, 1, 23, 23, 50, 7, {0, 0}}, 0}
iex> Calendar.ISO.parse_utc_datetime("-2015-01-23T23:50:07,123+02:30")
{:ok, {-2015, 1, 23, 21, 20, 7, {123000, 3}}, 9000}
iex> Calendar.ISO.parse_utc_datetime("2015-01-23P23:50:07")
{:error, :invalid_format}
iex> Calendar.ISO.parse_utc_datetime("2015-01-23T23:50:07")
{:error, :missing_offset}
iex> Calendar.ISO.parse_utc_datetime("2015-01-23 23:50:61")
{:error, :invalid_time}
iex> Calendar.ISO.parse_utc_datetime("2015-01-32 23:50:07")
{:error, :invalid_date}
iex> Calendar.ISO.parse_utc_datetime("2015-01-23T23:50:07.123-00:00")
{:error, :invalid_format}@spec quarter_of_year(year(), month(), day()) :: quarter_of_year()
Calculates the quarter of the year from the given year, month, and day.
It is an integer from 1 to 4.
Examples
iex> Calendar.ISO.quarter_of_year(2016, 1, 31)
1
iex> Calendar.ISO.quarter_of_year(2016, 4, 3)
2
iex> Calendar.ISO.quarter_of_year(-99, 9, 31)
3
iex> Calendar.ISO.quarter_of_year(2018, 12, 28)
4@spec time_from_day_fraction(Calendar.day_fraction()) :: {hour(), minute(), second(), microsecond()}
Converts a day fraction to this Calendar's representation of time.
Examples
iex> Calendar.ISO.time_from_day_fraction({1, 2})
{12, 0, 0, {0, 6}}
iex> Calendar.ISO.time_from_day_fraction({13, 24})
{13, 0, 0, {0, 6}}@spec time_to_day_fraction( Calendar.hour(), Calendar.minute(), Calendar.second(), Calendar.microsecond() ) :: Calendar.day_fraction()
Returns the normalized day fraction of the specified time.
Examples
iex> Calendar.ISO.time_to_day_fraction(0, 0, 0, {0, 6})
{0, 86400000000}
iex> Calendar.ISO.time_to_day_fraction(12, 34, 56, {123, 6})
{45296000123, 86400000000}time_to_string(hour, minute, second, microsecond, format \\ :extended)
View Source (since 1.5.0)@spec time_to_string( Calendar.hour(), Calendar.minute(), Calendar.second(), Calendar.microsecond(), :basic | :extended ) :: String.t()
Converts the given time into a string.
By default, returns times formatted in the "extended" format,
for human readability. It also supports the "basic" format
by passing the :basic option.
Examples
iex> Calendar.ISO.time_to_string(2, 2, 2, {2, 6})
"02:02:02.000002"
iex> Calendar.ISO.time_to_string(2, 2, 2, {2, 2})
"02:02:02.00"
iex> Calendar.ISO.time_to_string(2, 2, 2, {2, 0})
"02:02:02"
iex> Calendar.ISO.time_to_string(2, 2, 2, {2, 6}, :basic)
"020202.000002"
iex> Calendar.ISO.time_to_string(2, 2, 2, {2, 6}, :extended)
"02:02:02.000002"Determines if the date given is valid according to the proleptic Gregorian calendar.
Examples
iex> Calendar.ISO.valid_date?(2015, 2, 28)
true
iex> Calendar.ISO.valid_date?(2015, 2, 30)
false
iex> Calendar.ISO.valid_date?(-1, 12, 31)
true
iex> Calendar.ISO.valid_date?(-1, 12, 32)
false@spec valid_time?( Calendar.hour(), Calendar.minute(), Calendar.second(), Calendar.microsecond() ) :: boolean()
Determines if the date given is valid according to the proleptic Gregorian calendar.
Note that while ISO 8601 allows times to specify 24:00:00 as the zero hour of the next day, this notation is not supported by Elixir. Leap seconds are not supported as well by the built-in Calendar.ISO.
Examples
iex> Calendar.ISO.valid_time?(10, 50, 25, {3006, 6})
true
iex> Calendar.ISO.valid_time?(23, 59, 60, {0, 0})
false
iex> Calendar.ISO.valid_time?(24, 0, 0, {0, 0})
falseCalculates the year and era from the given year.
The ISO calendar has two eras: the "current era" (CE) which
starts in year 1 and is defined as era 1. And "before the current
era" (BCE) for those years less than 1, defined as era 0.
Examples
iex> Calendar.ISO.year_of_era(1)
{1, 1}
iex> Calendar.ISO.year_of_era(2018)
{2018, 1}
iex> Calendar.ISO.year_of_era(0)
{1, 0}
iex> Calendar.ISO.year_of_era(-1)
{2, 0}