1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14, c++17
10// UNSUPPORTED: no-filesystem, no-localization, no-tzdb
11
12// XFAIL: libcpp-has-no-experimental-tzdb
13// XFAIL: availability-tzdb-missing
14
15// <chrono>
16
17// class time_zone;
18
19// template <class _Duration>
20// local_time<common_type_t<Duration, seconds>>
21// to_local(const sys_time<Duration>& tp) const;
22
23#include <chrono>
24#include <format>
25#include <cassert>
26#include <string_view>
27
28#include "test_macros.h"
29#include "assert_macros.h"
30#include "concat_macros.h"
31
32int main(int, char**) {
33 // To make sure the test does not depend on changes in the database it uses a
34 // time zone with a fixed offset.
35 using namespace std::literals::chrono_literals;
36
37 const std::chrono::time_zone* tz = std::chrono::locate_zone("Etc/GMT+1");
38
39 assert(tz->to_local(std::chrono::sys_time<std::chrono::nanoseconds>{-1ns}) ==
40 std::chrono::local_time<std::chrono::nanoseconds>{-1ns - 1h});
41
42 assert(tz->to_local(std::chrono::sys_time<std::chrono::microseconds>{0us}) ==
43 std::chrono::local_time<std::chrono::microseconds>{0us - 1h});
44
45 assert(tz->to_local(
46 std::chrono::sys_time<std::chrono::seconds>{std::chrono::sys_days{std::chrono::January / 1 / -21970}}) ==
47 std::chrono::local_time<std::chrono::seconds>{
48 (std::chrono::sys_days{std::chrono::January / 1 / -21970}).time_since_epoch() - 1h});
49
50 assert(
51 tz->to_local(std::chrono::sys_time<std::chrono::days>{std::chrono::sys_days{std::chrono::January / 1 / 21970}}) ==
52 std::chrono::local_time<std::chrono::seconds>{
53 (std::chrono::sys_days{std::chrono::January / 1 / 21970}).time_since_epoch() - 1h});
54
55 assert(tz->to_local(std::chrono::sys_time<std::chrono::weeks>{}) ==
56 std::chrono::local_time<std::chrono::seconds>{
57 (std::chrono::sys_days{std::chrono::January / 1 / 1970}).time_since_epoch() - 1h});
58
59 assert(tz->to_local(std::chrono::sys_time<std::chrono::months>{}) ==
60 std::chrono::local_time<std::chrono::seconds>{
61 (std::chrono::sys_days{std::chrono::January / 1 / 1970}).time_since_epoch() - 1h});
62
63 assert(tz->to_local(std::chrono::sys_time<std::chrono::years>{}) ==
64 std::chrono::local_time<std::chrono::seconds>{
65 (std::chrono::sys_days{std::chrono::January / 1 / 1970}).time_since_epoch() - 1h});
66
67 return 0;
68}
69

source code of libcxx/test/std/time/time.zone/time.zone.timezone/time.zone.members/to_local.pass.cpp