-module(time_util).

-include_lib("kernel/include/file.hrl").


-export([
    get_cur_time/0,get_cur_time/1,
    format_time_to_str/1,
    timestamp/0,timestamp_ms/0,
    timestamp_to_datetime/1,
    timestamp_to_local_datetime/1,
    get_cur_date/0,
    datetime_to_timestamp/1]).


get_cur_time()->
	  {{Year,Month,Day},{Hour,Min,Second}}=calendar:now_to_local_time(os:timestamp()),
	  io_lib:format("~4..0w-~2..0w-~2..0w ~2..0w:~2..0w:~2..0w",[Year, Month, Day, Hour,Min,Second]).

get_cur_date()->
	  {{Year,Month,Day},{Hour,Min,Second}}=calendar:now_to_local_time(os:timestamp()),
    io_lib:format("~4..0w-~2..0w-~2..0w",[Year, Month, Day]).

get_cur_time({{Year,Month,Day},{Hour,Min,Second}})->
	  io_lib:format("~4..0w-~2..0w-~2..0w ~2..0w:~2..0w:~2..0w",[Year, Month, Day, Hour,Min,Second]).

format_time_to_str({{Year,Month,Day},{Hour,Min,Second}})->
	  io_lib:format("~4..0w-~2..0w-~2..0w ~2..0w:~2..0w:~2..0w",[Year, Month, Day, Hour,Min,Second]).

timestamp() ->
    {M, S, _} = os:timestamp(),
    M * 1000000 + S.
timestamp_ms()->
    {M,S,W} = os:timestamp(),
    M*1000000000+S*1000+(W div 1000).

timestamp_to_datetime(Timestamp) ->
    calendar:gregorian_seconds_to_datetime(Timestamp +
      calendar:datetime_to_gregorian_seconds({{1970,1,1}, {0,0,0}})).
timestamp_to_local_datetime(Timestamp) ->
    Date=calendar:gregorian_seconds_to_datetime(Timestamp +
      calendar:datetime_to_gregorian_seconds({{1970,1,1}, {0,0,0}})),
    calendar:universal_time_to_local_time(Date).

datetime_to_timestamp(Date)->
	  [{D,T}]=calendar:local_time_to_universal_time_dst(Date),
	  S = calendar:datetime_to_gregorian_seconds({D, T}),
    S1 = calendar:datetime_to_gregorian_seconds({{1970, 1, 1}, {0, 0, 0}}),
    (S - S1).