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launchdarkly_server_sdk

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LaunchDarkly SDK for Erlang

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launchdarkly_server_sdk src ldclient_time.erl
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src/ldclient_time.erl 

%%-------------------------------------------------------------------

%% @doc Local module for erlang module time methods.

%% This allows them to be easily mocked for testing.

%% @private

%% @end

%%-------------------------------------------------------------------

-module(ldclient_time).



%% API

-export([

    time_seconds/0,

    start_timer/3,

    datetime_to_timestamp/1

]).



%% The difference between the start of the Gregorian calendar and 1/1/1970 (Unix Epoch).

-define(GREGORIAN_UNIX_OFFSET_SECONDS, 62167219200).



-spec time_seconds() -> integer().

time_seconds() ->

    erlang:monotonic_time(second).



-spec start_timer(Time :: non_neg_integer(), Dest :: pid() | atom(),  Msg :: term())  -> Timer :: reference().

start_timer(Time,  Dest, Msg) ->

    erlang:start_timer(Time, Dest, Msg).



%% There isn't a built-in method to convert from a calendar:datetime() to a unix timestamp.

%% This is useful to allow comparison between a parsed date and erlang:system_time.

-spec datetime_to_timestamp(DateTime :: calendar:datetime()) -> UtcMilliseconds :: integer().

datetime_to_timestamp(DateTime) ->

    (calendar:datetime_to_gregorian_seconds(DateTime) - ?GREGORIAN_UNIX_OFFSET_SECONDS) * 1000.