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-rw-r--r--lib/stdlib/src/calendar.erl166
1 files changed, 160 insertions, 6 deletions
diff --git a/lib/stdlib/src/calendar.erl b/lib/stdlib/src/calendar.erl
index 2e24e8c133..9a600c1972 100644
--- a/lib/stdlib/src/calendar.erl
+++ b/lib/stdlib/src/calendar.erl
@@ -39,10 +39,14 @@
now_to_datetime/1, % = now_to_universal_time/1
now_to_local_time/1,
now_to_universal_time/1,
+ rfc3339_to_system_time/1,
+ rfc3339_to_system_time/2,
seconds_to_daystime/1,
seconds_to_time/1,
system_time_to_local_time/2,
system_time_to_universal_time/2,
+ system_time_to_rfc3339/1,
+ system_time_to_rfc3339/2,
time_difference/2,
time_to_seconds/1,
universal_time/0,
@@ -57,11 +61,13 @@
-define(SECONDS_PER_DAY, 86400).
-define(DAYS_PER_YEAR, 365).
-define(DAYS_PER_LEAP_YEAR, 366).
--define(DAYS_PER_4YEARS, 1461).
--define(DAYS_PER_100YEARS, 36524).
--define(DAYS_PER_400YEARS, 146097).
+%% -define(DAYS_PER_4YEARS, 1461).
+%% -define(DAYS_PER_100YEARS, 36524).
+%% -define(DAYS_PER_400YEARS, 146097).
-define(DAYS_FROM_0_TO_1970, 719528).
+-define(DAYS_FROM_0_TO_10000, 2932897).
-define(SECONDS_FROM_0_TO_1970, (?DAYS_FROM_0_TO_1970*?SECONDS_PER_DAY)).
+-define(SECONDS_FROM_0_TO_10000, (?DAYS_FROM_0_TO_10000*?SECONDS_PER_DAY)).
%%----------------------------------------------------------------------
%% Types
@@ -86,6 +92,13 @@
-type datetime1970() :: {{year1970(),month(),day()},time()}.
-type yearweeknum() :: {year(),weeknum()}.
+-type rfc3339_string() :: [byte(), ...].
+%% By design 'native' is not supported:
+-type rfc3339_time_unit() :: 'microsecond'
+ | 'millisecond'
+ | 'nanosecond'
+ | 'second'.
+
%%----------------------------------------------------------------------
%% All dates are according the the Gregorian calendar. In this module
@@ -312,8 +325,7 @@ local_time_to_universal_time_dst(DateTime) ->
-spec now_to_datetime(Now) -> datetime1970() when
Now :: erlang:timestamp().
now_to_datetime({MSec, Sec, _uSec}) ->
- Sec0 = MSec*1000000 + Sec + ?SECONDS_FROM_0_TO_1970,
- gregorian_seconds_to_datetime(Sec0).
+ system_time_to_datetime(MSec*1000000 + Sec).
-spec now_to_universal_time(Now) -> datetime1970() when
Now :: erlang:timestamp().
@@ -331,6 +343,33 @@ now_to_local_time({MSec, Sec, _uSec}) ->
erlang:universaltime_to_localtime(
now_to_universal_time({MSec, Sec, _uSec})).
+-spec rfc3339_to_system_time(DateTimeString) -> integer() when
+ DateTimeString :: rfc3339_string().
+
+rfc3339_to_system_time(DateTimeString) ->
+ rfc3339_to_system_time(DateTimeString, []).
+
+-spec rfc3339_to_system_time(DateTimeString, Options) -> integer() when
+ DateTimeString :: rfc3339_string(),
+ Options :: [Option],
+ Option :: {'unit', rfc3339_time_unit()}.
+
+rfc3339_to_system_time(DateTimeString, Options) ->
+ Unit = proplists:get_value(unit, Options, second),
+ %% _T is the character separating the date and the time:
+ {DateStr, [_T|TimeStr]} = lists:split(10, DateTimeString),
+ {TimeStr2, TimeStr3} = lists:split(8, TimeStr),
+ {ok, [Hour, Min, Sec], []} = io_lib:fread("~d:~d:~d", TimeStr2),
+ {ok, [Year, Month, Day], []} = io_lib:fread("~d-~d-~d", DateStr),
+ DateTime = {{Year, Month, Day}, {Hour, Min, Sec}},
+ IsFractionChar = fun(C) -> C >= $0 andalso C =< $9 orelse C =:= $. end,
+ {FractionStr, UtcOffset} = lists:splitwith(IsFractionChar, TimeStr3),
+ Time = datetime_to_system_time(DateTime),
+ Secs = Time - offset_adjustment(Time, second, UtcOffset),
+ check(DateTimeString, Options, Secs),
+ ScaledEpoch = erlang:convert_time_unit(Secs, second, Unit),
+ ScaledEpoch + copy_sign(fraction(Unit, FractionStr), ScaledEpoch).
+
%% seconds_to_daystime(Secs) = {Days, {Hour, Minute, Second}}
@@ -380,7 +419,40 @@ system_time_to_local_time(Time, TimeUnit) ->
system_time_to_universal_time(Time, TimeUnit) ->
Secs = erlang:convert_time_unit(Time, TimeUnit, second),
- gregorian_seconds_to_datetime(Secs + ?SECONDS_FROM_0_TO_1970).
+ system_time_to_datetime(Secs).
+
+-spec system_time_to_rfc3339(Time) -> DateTimeString when
+ Time :: integer(),
+ DateTimeString :: rfc3339_string().
+
+system_time_to_rfc3339(Time) ->
+ system_time_to_rfc3339(Time, []).
+
+-type offset() :: [byte()] | (Time :: integer()).
+-spec system_time_to_rfc3339(Time, Options) -> DateTimeString when
+ Time :: integer(), % Since Epoch
+ Options :: [Option],
+ Option :: {'offset', offset()}
+ | {'time_designator', byte()}
+ | {'unit', rfc3339_time_unit()},
+ DateTimeString :: rfc3339_string().
+
+system_time_to_rfc3339(Time, Options) ->
+ Unit = proplists:get_value(unit, Options, second),
+ OffsetOption = proplists:get_value(offset, Options, ""),
+ T = proplists:get_value(time_designator, Options, $T),
+ AdjustmentSecs = offset_adjustment(Time, Unit, OffsetOption),
+ Offset = offset(OffsetOption, AdjustmentSecs),
+ Adjustment = erlang:convert_time_unit(AdjustmentSecs, second, Unit),
+ AdjustedTime = Time + Adjustment,
+ Factor = factor(Unit),
+ Secs = AdjustedTime div Factor,
+ check(Time, Options, Secs),
+ DateTime = system_time_to_datetime(Secs),
+ {{Year, Month, Day}, {Hour, Min, Sec}} = DateTime,
+ FractionStr = fraction_str(Factor, AdjustedTime),
+ flat_fwrite("~4.10.0B-~2.10.0B-~2.10.0B~c~2.10.0B:~2.10.0B:~2.10.0B~s~s",
+ [Year, Month, Day, T, Hour, Min, Sec, FractionStr, Offset]).
%% time_difference(T1, T2) = Tdiff
%%
@@ -569,3 +641,85 @@ df(Year, _) ->
true -> 1;
false -> 0
end.
+
+check(_Arg, _Options, Secs) when Secs >= - ?SECONDS_FROM_0_TO_1970,
+ Secs < ?SECONDS_FROM_0_TO_10000 ->
+ ok;
+check(Arg, Options, _Secs) ->
+ erlang:error({badarg, [Arg, Options]}).
+
+datetime_to_system_time(DateTime) ->
+ datetime_to_gregorian_seconds(DateTime) - ?SECONDS_FROM_0_TO_1970.
+
+system_time_to_datetime(Seconds) ->
+ gregorian_seconds_to_datetime(Seconds + ?SECONDS_FROM_0_TO_1970).
+
+offset(OffsetOption, Secs0) when OffsetOption =:= "";
+ is_integer(OffsetOption) ->
+ Sign = case Secs0 < 0 of
+ true -> $-;
+ false -> $+
+ end,
+ Secs = abs(Secs0),
+ Hour = Secs div 3600,
+ Min = (Secs rem 3600) div 60,
+ io_lib:fwrite("~c~2.10.0B:~2.10.0B", [Sign, Hour, Min]);
+offset(OffsetOption, _Secs) ->
+ OffsetOption.
+
+offset_adjustment(Time, Unit, OffsetString) when is_list(OffsetString) ->
+ offset_string_adjustment(Time, Unit, OffsetString);
+offset_adjustment(_Time, Unit, Offset) when is_integer(Offset) ->
+ erlang:convert_time_unit(Offset, Unit, second).
+
+offset_string_adjustment(Time, Unit, "") ->
+ local_offset(Time, Unit);
+offset_string_adjustment(_Time, _Unit, "Z") ->
+ 0;
+offset_string_adjustment(_Time, _Unit, "z") ->
+ 0;
+offset_string_adjustment(_Time, _Unit, [Sign|Tz]) ->
+ {ok, [Hour, Min], []} = io_lib:fread("~d:~d", Tz),
+ Adjustment = 3600 * Hour + 60 * Min,
+ case Sign of
+ $- -> -Adjustment;
+ $+ -> Adjustment
+ end.
+
+local_offset(SystemTime, Unit) ->
+ LocalTime = system_time_to_local_time(SystemTime, Unit),
+ UniversalTime = system_time_to_universal_time(SystemTime, Unit),
+ LocalSecs = datetime_to_gregorian_seconds(LocalTime),
+ UniversalSecs = datetime_to_gregorian_seconds(UniversalTime),
+ LocalSecs - UniversalSecs.
+
+fraction_str(Factor, Time) ->
+ case Time rem Factor of
+ 0 ->
+ "";
+ Fraction ->
+ FS = io_lib:fwrite(".~*..0B", [log10(Factor), abs(Fraction)]),
+ string:trim(FS, trailing, "0")
+ end.
+
+fraction(second, _) ->
+ 0;
+fraction(_, "") ->
+ 0;
+fraction(Unit, FractionStr) ->
+ round(factor(Unit) * list_to_float([$0|FractionStr])).
+
+copy_sign(N1, N2) when N2 < 0 -> -N1;
+copy_sign(N1, _N2) -> N1.
+
+factor(second) -> 1;
+factor(millisecond) -> 1000;
+factor(microsecond) -> 1000000;
+factor(nanosecond) -> 1000000000.
+
+log10(1000) -> 3;
+log10(1000000) -> 6;
+log10(1000000000) -> 9.
+
+flat_fwrite(F, S) ->
+ lists:flatten(io_lib:fwrite(F, S)).
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-15 20:18:47 +0000