calendar:is_leap_year/1

判断一个年份是否是闰年

用法：

is_leap_year(Year) -> boolean()

内部实现：

%% is_leap_year(Year) = true | false
%%
-spec is_leap_year(Year) -> boolean() when
      Year :: year().
is_leap_year(Y) when is_integer(Y), Y >= 0 ->
    is_leap_year1(Y).

-spec is_leap_year1(year()) -> boolean().
is_leap_year1(Year) when Year rem 4 =:= 0, Year rem 100 > 0 ->
    true;
is_leap_year1(Year) when Year rem 400 =:= 0 ->
    true;
is_leap_year1(_) -> false.

这个函数检查一个年份是否为闰年。

calendar:is_leap_year(1996).

calendar:is_leap_year(2009).

{{Year, _Month, _Day}, {_Hour, _Minute, _Second}} = calendar:now_to_local_time(os:timestamp()),
calendar:is_leap_year(Year).