Elixir

v1.3.3

Elixir

Elixir v1.3.3 NaiveDateTime View Source

A NaiveDateTime struct (without a time zone) and functions.

The NaiveDateTime struct contains the fields year, month, day, hour, minute, second, microsecond and calendar. New naive date times can be built with the new/7 function or using the ~N sigil:

iex> ~N[2000-01-01 23:00:07]
~N[2000-01-01 23:00:07]

Both new/7 and sigil return a struct where the date fields can be accessed directly:

iex> naive = ~N[2000-01-01 23:00:07]
iex> naive.year
2000
iex> naive.second
7

The naive bit implies this datetime representation does not have a timezone. This means the datetime may not actually exist in certain areas in the world even though it is valid.

For example, when daylight saving changes are applied by a region, the clock typically moves forward or backward by one hour. This means certain datetimes never occur or may occur more than once. Since NaiveDateTime is not validated against a timezone, such errors would go unnoticed.

Developers should avoid creating the NaiveDateTime struct directly and instead rely on the functions provided by this module as well as the ones in 3rd party calendar libraries.

Link to this section Summary

Types

t()

Functions

from_erl(arg, microsecond \\ {0, 0})

Converts an Erlang datetime tuple to a NaiveDateTime struct

from_erl!(tuple, microsecond \\ {0, 0})

Converts an Erlang datetime tuple to a NaiveDateTime struct

from_iso8601(arg)

Parses the extended “Date and time of day” format described by ISO8601:2004

from_iso8601!(string)

Parses the extended “Date and time of day” format described by ISO8601:2004

new(date, time)

Builds a naive date time from date and time structs

new(year, month, day, hour, minute, second, microsecond \\ {0, 0})

Builds a new ISO naive date time

to_date(naive_date_time)

Converts a NaiveDateTime into a Date

to_erl(naive_date_time)

Converts a NaiveDateTime struct to an Erlang datetime tuple

to_iso8601(naive)

Converts the given naive date time to ISO8601

to_string(naive)

Converts the given naive date time to a string according to its calendar

to_time(naive_date_time)

Converts a NaiveDateTime into Time

Link to this section Types

Link to this type t() View Source 
t() :: %NaiveDateTime{calendar: Calendar.calendar, day: Calendar.day, hour: Calendar.hour, microsecond: Calendar.microsecond, minute: Calendar.minute, month: Calendar.month, second: Calendar.second, year: Calendar.year}

Link to this section Functions

Link to this function from_erl(arg, microsecond \\ {0, 0}) View Source 
from_erl(:calendar.datetime, Calendar.microsecond) ::
  {:ok, NaiveDateTime.t} |
  {:error, atom}

Converts an Erlang datetime tuple to a NaiveDateTime struct.

Attempting to convert an invalid ISO calendar date will produce an error tuple.

Examples 

iex> NaiveDateTime.from_erl({{2000, 1, 1}, {13, 30, 15}})
{:ok, ~N[2000-01-01 13:30:15]}
iex> NaiveDateTime.from_erl({{2000, 1, 1}, {13, 30, 15}}, {5000, 3})
{:ok, ~N[2000-01-01 13:30:15.005]}
iex> NaiveDateTime.from_erl({{2000, 13, 1}, {13, 30, 15}})
{:error, :invalid_date}
iex> NaiveDateTime.from_erl({{2000, 13, 1},{13, 30, 15}})
{:error, :invalid_date}
Link to this function from_erl!(tuple, microsecond \\ {0, 0}) View Source 
from_erl!(:calendar.datetime, Calendar.microsecond) ::
  NaiveDateTime.t |
  no_return

Converts an Erlang datetime tuple to a NaiveDateTime struct.

Raises if the datetime is invalid. Attempting to convert an invalid ISO calendar date will produce an error tuple.

Examples 

iex> NaiveDateTime.from_erl!({{2000, 1, 1}, {13, 30, 15}})
~N[2000-01-01 13:30:15]
iex> NaiveDateTime.from_erl!({{2000, 1, 1}, {13, 30, 15}}, {5000, 3})
~N[2000-01-01 13:30:15.005]
iex> NaiveDateTime.from_erl!({{2000, 13, 1}, {13, 30, 15}})
** (ArgumentError) cannot convert {{2000, 13, 1}, {13, 30, 15}} to naive date time, reason: :invalid_date
Link to this function from_iso8601(arg) View Source 
from_iso8601(String.t) ::
  {:ok, NaiveDateTime.t} |
  {:error, atom}

Parses the extended “Date and time of day” format described by ISO8601:2004.

Timezone offset may be included in the string but they will be simply discarded as such information is not included in naive date times.

As specified in the standard, the separator “T” may be omitted if desired as there is no ambiguity within this function.

Time representations with reduced accuracy are not supported.

Examples 

iex> NaiveDateTime.from_iso8601("2015-01-23 23:50:07")
{:ok, ~N[2015-01-23 23:50:07]}
iex> NaiveDateTime.from_iso8601("2015-01-23T23:50:07")
{:ok, ~N[2015-01-23 23:50:07]}
iex> NaiveDateTime.from_iso8601("2015-01-23T23:50:07Z")
{:ok, ~N[2015-01-23 23:50:07]}

iex> NaiveDateTime.from_iso8601("2015-01-23 23:50:07.0")
{:ok, ~N[2015-01-23 23:50:07.0]}
iex> NaiveDateTime.from_iso8601("2015-01-23 23:50:07.0123456")
{:ok, ~N[2015-01-23 23:50:07.012345]}
iex> NaiveDateTime.from_iso8601("2015-01-23T23:50:07.123Z")
{:ok, ~N[2015-01-23 23:50:07.123]}

iex> NaiveDateTime.from_iso8601("2015-01-23P23:50:07")
{:error, :invalid_format}
iex> NaiveDateTime.from_iso8601("2015:01:23 23-50-07")
{:error, :invalid_format}
iex> NaiveDateTime.from_iso8601("2015-01-23 23:50:07A")
{:error, :invalid_format}
iex> NaiveDateTime.from_iso8601("2015-01-23 23:50:61")
{:error, :invalid_time}
iex> NaiveDateTime.from_iso8601("2015-01-32 23:50:07")
{:error, :invalid_date}

iex> NaiveDateTime.from_iso8601("2015-01-23T23:50:07.123+02:30")
{:ok, ~N[2015-01-23 23:50:07.123]}
iex> NaiveDateTime.from_iso8601("2015-01-23T23:50:07.123+00:00")
{:ok, ~N[2015-01-23 23:50:07.123]}
iex> NaiveDateTime.from_iso8601("2015-01-23T23:50:07.123-02:30")
{:ok, ~N[2015-01-23 23:50:07.123]}
iex> NaiveDateTime.from_iso8601("2015-01-23T23:50:07.123-00:00")
{:error, :invalid_format}
iex> NaiveDateTime.from_iso8601("2015-01-23T23:50:07.123-00:60")
{:error, :invalid_format}
iex> NaiveDateTime.from_iso8601("2015-01-23T23:50:07.123-24:00")
{:error, :invalid_format}
Link to this function from_iso8601!(string) View Source 
from_iso8601!(String.t) :: NaiveDateTime.t | no_return

Parses the extended “Date and time of day” format described by ISO8601:2004.

Raises if the format is invalid.

Examples 

iex> NaiveDateTime.from_iso8601!("2015-01-23T23:50:07.123Z")
~N[2015-01-23 23:50:07.123]
iex> NaiveDateTime.from_iso8601!("2015-01-23P23:50:07")
** (ArgumentError) cannot parse "2015-01-23P23:50:07" as naive date time, reason: :invalid_format
Link to this function new(date, time) View Source 
new(Date.t, Time.t) :: {:ok, NaiveDateTime.t}

Builds a naive date time from date and time structs.

Examples 

iex> NaiveDateTime.new(~D[2010-01-13], ~T[23:00:07.005])
{:ok, ~N[2010-01-13 23:00:07.005]}
Link to this function new(year, month, day, hour, minute, second, microsecond \\ {0, 0}) View Source 
new(Calendar.year, Calendar.month, Calendar.day, Calendar.hour, Calendar.minute, Calendar.second, Calendar.microsecond) ::
  {:ok, NaiveDateTime.t} |
  {:error, atom}

Builds a new ISO naive date time.

Expects all values to be integers. Returns {:ok, naive_date_time} if each entry fits its appropriate range, returns {:error, reason} otherwise.

Examples 

iex> NaiveDateTime.new(2000, 1, 1, 0, 0, 0)
{:ok, ~N[2000-01-01 00:00:00]}
iex> NaiveDateTime.new(2000, 13, 1, 0, 0, 0)
{:error, :invalid_date}
iex> NaiveDateTime.new(2000, 2, 29, 0, 0, 0)
{:ok, ~N[2000-02-29 00:00:00]}
iex> NaiveDateTime.new(2000, 2, 30, 0, 0, 0)
{:error, :invalid_date}
iex> NaiveDateTime.new(2001, 2, 29, 0, 0, 0)
{:error, :invalid_date}

iex> NaiveDateTime.new(2000, 1, 1, 23, 59, 59, {0, 1})
{:ok, ~N[2000-01-01 23:59:59.0]}
iex> NaiveDateTime.new(2000, 1, 1, 23, 59, 59, 999_999)
{:ok, ~N[2000-01-01 23:59:59.999999]}
iex> NaiveDateTime.new(2000, 1, 1, 23, 59, 60, 999_999)
{:ok, ~N[2000-01-01 23:59:60.999999]}
iex> NaiveDateTime.new(2000, 1, 1, 24, 59, 59, 999_999)
{:error, :invalid_time}
iex> NaiveDateTime.new(2000, 1, 1, 23, 60, 59, 999_999)
{:error, :invalid_time}
iex> NaiveDateTime.new(2000, 1, 1, 23, 59, 61, 999_999)
{:error, :invalid_time}
iex> NaiveDateTime.new(2000, 1, 1, 23, 59, 59, 1_000_000)
{:error, :invalid_time}
Link to this function to_date(naive_date_time) View Source

Converts a NaiveDateTime into a Date.

Because Date does not hold time information, data will be lost during the conversion.

Examples 

iex> NaiveDateTime.to_date(~N[2002-01-13 23:00:07])
~D[2002-01-13]
Link to this function to_erl(naive_date_time) View Source 
to_erl(NaiveDateTime.t) :: :calendar.datetime

Converts a NaiveDateTime struct to an Erlang datetime tuple.

Only supports converting naive date times which are in the ISO calendar, attempting to convert naive date times from other calendars will raise.

WARNING: Loss of precision may occur, as Erlang time tuples only store hour/minute/second.

Examples 

iex> NaiveDateTime.to_erl(~N[2000-01-01 13:30:15])
{{2000, 1, 1}, {13, 30, 15}}
Link to this function to_iso8601(naive) View Source 
to_iso8601(NaiveDateTime.t) :: String.t

Converts the given naive date time to ISO8601.

Only supports converting naive date times which are in the ISO calendar, attempting to convert naive date times from other calendars will raise.

Examples

iex> NaiveDateTime.to_iso8601(~N[2000-02-28 23:00:13])
"2000-02-28T23:00:13"

iex> NaiveDateTime.to_iso8601(~N[2000-02-28 23:00:13.001])
"2000-02-28T23:00:13.001"
Link to this function to_string(naive) View Source 
to_string(NaiveDateTime.t) :: String.t

Converts the given naive date time to a string according to its calendar.

Examples

iex> NaiveDateTime.to_string(~N[2000-02-28 23:00:13])
"2000-02-28 23:00:13"

iex> NaiveDateTime.to_string(~N[2000-02-28 23:00:13.001])
"2000-02-28 23:00:13.001"
Link to this function to_time(naive_date_time) View Source

Converts a NaiveDateTime into Time.

Because Time does not hold date information, data will be lost during the conversion.

Examples 

iex> NaiveDateTime.to_time(~N[2002-01-13 23:00:07])
~T[23:00:07]