114 lines
2.5 KiB
Erlang
114 lines
2.5 KiB
Erlang
-module(ezic).
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-include("include/ezic.hrl").
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-export([
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localtime/1
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, utc_to_local/2
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% , local_to_utc/2
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% , zone_convert/3
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, next_timechange/1
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, next_timechange/2
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]).
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-export([load/1, dev_start/0, test/0]).
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-define(gs2dt(X), calendar:gregorian_seconds_to_datetime(X)).
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-define(dt2gs(X), calendar:datetime_to_gregorian_seconds(X)).
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% API
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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localtime(TzName) ->
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utc_to_local(erlang:universaltime(), TzName).
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utc_to_local(UTCDatetime, TzName) ->
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{ok, Zone, Rule}= current_as_of_utc(UTCDatetime, TzName),
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SecDiff= time_offset(Zone, Rule),
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date_add(UTCDatetime, SecDiff).
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%% local_to_utc(Datetime, TzName) ->
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%% {ok, Zone, Rule}= current_as_of_local(Datetime, TzName),
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%% SecDiff= time_offset(Zone, Rule),
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%% date_subtract(Datetime, SecDiff).
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%% zone_convert(Datetime, FromTimeZone, ToTimeZone) ->
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%% UTC= local_to_utc(Datetime, FromTimeZone),
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%% utc_to_local(UTC, ToTimeZone).
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next_timechange(TzName) ->
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next_timechange(erlang:universaltime(), TzName).
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next_timechange(UTCDatetime, TzName) ->
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UTCDatetime, TzName,
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not_done.
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% DEV API
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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load(Folder) ->
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ezic_loader:load(Folder),
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ezic_flatten:flatten().
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dev_start() ->
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ezic:load(filename:join("priv","tzdata")).
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test() ->
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lists:foreach(
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fun(TZ)->
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io:format("~s: ~p~n", [TZ, localtime(TZ)])
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end,
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["Asia/Tokyo", "America/New_York", "America/Los_Angeles", "America/Jamaica", "Australia/Adelaide"]).
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% PRIVATE
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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current_as_of_utc(UTCDatetime, TzName) ->
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CZone= ezic_zone:current_as_of_utc(UTCDatetime, TzName),
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RuleName= CZone#zone.rule,
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Rules= ezic_db:rules(RuleName),
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CRule= ezic_rule:current_as_of_utc(UTCDatetime, Rules),
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{ok, CZone, CRule}.
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%%current_as_of_local(Datetime, TzName) ->
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%% not_done.
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time_offset(Zone, Rule) ->
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OffsetSec= ezic_zone:offset_sec(Zone),
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DSTSec= ezic_rule:dst_sec(Rule),
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OffsetSec + DSTSec.
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date_add(Datetime, SecDiff) ->
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?gs2dt(?dt2gs(Datetime) + SecDiff).
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%% date_subtract(Datetime, SecDiff) ->
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%% ?gs2dt(?dt2gs(Datetime) - SecDiff).
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