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/*
* Copyright (c) 2006-2026, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* Test Case Name: POSIX Time Conversion Test
*
* Test Objectives:
* - Verify that timegm normalizes dates across month and year boundaries.
* - Verify negative values in the time fields are normalized.
* - Verify leap-year February handling.
* - Prevent regression of GitHub Issue #11686.
*/
#include <rtthread.h>
#include <sys/time.h>
#include "utest.h"
/* Verify that timegm output agrees with a UTC round-trip conversion. */
static void timegm_assert_consistent(const char *case_name,
struct tm *time_value,
time_t expected_timestamp)
{
struct tm normalized = { 0 };
time_t timestamp;
timestamp = timegm(time_value);
uassert_int_equal(timestamp, expected_timestamp);
LOG_I("%s: timestamp=%ld, normalized=%04d-%02d-%02d %02d:%02d:%02d",
case_name,
(long)timestamp,
time_value->tm_year + 1900,
time_value->tm_mon + 1,
time_value->tm_mday,
time_value->tm_hour,
time_value->tm_min,
time_value->tm_sec);
if (gmtime_r(×tamp, &normalized) == RT_NULL)
{
uassert_not_null(RT_NULL);
return;
}
uassert_int_equal(normalized.tm_year, time_value->tm_year);
uassert_int_equal(normalized.tm_mon, time_value->tm_mon);
uassert_int_equal(normalized.tm_mday, time_value->tm_mday);
uassert_int_equal(normalized.tm_hour, time_value->tm_hour);
uassert_int_equal(normalized.tm_min, time_value->tm_min);
uassert_int_equal(normalized.tm_sec, time_value->tm_sec);
uassert_int_equal(normalized.tm_yday, time_value->tm_yday);
uassert_int_equal(normalized.tm_wday, time_value->tm_wday);
}
/* Verify date normalization across a regular month boundary. */
static void timegm_month_boundary_test(void)
{
struct tm time_value = { 0 };
time_value.tm_year = 123;
time_value.tm_mon = 0;
time_value.tm_mday = 32;
timegm(&time_value);
uassert_int_equal(time_value.tm_year, 123);
uassert_int_equal(time_value.tm_mon, 1);
uassert_int_equal(time_value.tm_mday, 1);
}
/* Verify date normalization for February in a leap year. */
static void timegm_leap_year_test(void)
{
struct tm time_value = { 0 };
time_value.tm_year = 124;
time_value.tm_mon = 0;
time_value.tm_mday = 60;
timegm(&time_value);
uassert_int_equal(time_value.tm_year, 124);
uassert_int_equal(time_value.tm_mon, 1);
uassert_int_equal(time_value.tm_mday, 29);
}
/* Verify date normalization for a large day offset. */
static void timegm_large_day_test(void)
{
struct tm time_value = { 0 };
time_value.tm_year = 126;
time_value.tm_mon = 7;
time_value.tm_mday = 425;
time_value.tm_hour = 8;
timegm_assert_consistent("large day offset",
&time_value,
(time_t)1822204800);
uassert_int_equal(time_value.tm_year, 127);
uassert_int_equal(time_value.tm_mon, 8);
uassert_int_equal(time_value.tm_mday, 29);
uassert_int_equal(time_value.tm_hour, 8);
uassert_int_equal(time_value.tm_yday, 271);
uassert_int_equal(time_value.tm_wday, 3);
}
/* Verify zero-day normalization across a year boundary. */
static void timegm_zero_day_test(void)
{
struct tm time_value = { 0 };
time_value.tm_year = 123;
time_value.tm_mon = 0;
time_value.tm_mday = 0;
timegm_assert_consistent("zero day",
&time_value,
(time_t)1672444800);
uassert_int_equal(time_value.tm_year, 122);
uassert_int_equal(time_value.tm_mon, 11);
uassert_int_equal(time_value.tm_mday, 31);
}
/* Verify negative-day normalization in a leap year. */
static void timegm_negative_day_test(void)
{
struct tm time_value = { 0 };
time_value.tm_year = 124;
time_value.tm_mon = 2;
time_value.tm_mday = -1;
timegm_assert_consistent("negative day",
&time_value,
(time_t)1709078400);
uassert_int_equal(time_value.tm_year, 124);
uassert_int_equal(time_value.tm_mon, 1);
uassert_int_equal(time_value.tm_mday, 28);
}
/* Verify negative-second normalization across a year boundary. */
static void timegm_negative_second_test(void)
{
struct tm time_value = { 0 };
time_value.tm_year = 123;
time_value.tm_mon = 0;
time_value.tm_mday = 1;
time_value.tm_sec = -61;
timegm(&time_value);
uassert_int_equal(time_value.tm_year, 122);
uassert_int_equal(time_value.tm_mon, 11);
uassert_int_equal(time_value.tm_mday, 31);
uassert_int_equal(time_value.tm_hour, 23);
uassert_int_equal(time_value.tm_min, 58);
uassert_int_equal(time_value.tm_sec, 59);
}
/* Verify negative-minute normalization across a year boundary. */
static void timegm_negative_minute_test(void)
{
struct tm time_value = { 0 };
time_value.tm_year = 123;
time_value.tm_mon = 0;
time_value.tm_mday = 1;
time_value.tm_min = -1;
timegm(&time_value);
uassert_int_equal(time_value.tm_year, 122);
uassert_int_equal(time_value.tm_mon, 11);
uassert_int_equal(time_value.tm_mday, 31);
uassert_int_equal(time_value.tm_hour, 23);
uassert_int_equal(time_value.tm_min, 59);
uassert_int_equal(time_value.tm_sec, 0);
}
/* Verify negative-hour normalization across a year boundary. */
static void timegm_negative_hour_test(void)
{
struct tm time_value = { 0 };
time_value.tm_year = 123;
time_value.tm_mon = 0;
time_value.tm_mday = 1;
time_value.tm_hour = -1;
timegm(&time_value);
uassert_int_equal(time_value.tm_year, 122);
uassert_int_equal(time_value.tm_mon, 11);
uassert_int_equal(time_value.tm_mday, 31);
uassert_int_equal(time_value.tm_hour, 23);
uassert_int_equal(time_value.tm_min, 0);
uassert_int_equal(time_value.tm_sec, 0);
}
/* Verify negative-month normalization across a year boundary. */
static void timegm_negative_month_test(void)
{
struct tm time_value = { 0 };
time_value.tm_year = 123;
time_value.tm_mon = -13;
time_value.tm_mday = 1;
timegm(&time_value);
uassert_int_equal(time_value.tm_year, 121);
uassert_int_equal(time_value.tm_mon, 11);
uassert_int_equal(time_value.tm_mday, 1);
}
/* Verify positive overflow across all time fields. */
static void timegm_positive_overflow_test(void)
{
struct tm time_value = { 0 };
time_value.tm_year = 123;
time_value.tm_mon = 12;
time_value.tm_mday = 1;
time_value.tm_hour = 25;
time_value.tm_min = 61;
time_value.tm_sec = 61;
timegm_assert_consistent("positive overflow",
&time_value,
(time_t)1704160921);
uassert_int_equal(time_value.tm_year, 124);
uassert_int_equal(time_value.tm_mon, 0);
uassert_int_equal(time_value.tm_mday, 2);
uassert_int_equal(time_value.tm_hour, 2);
uassert_int_equal(time_value.tm_min, 2);
uassert_int_equal(time_value.tm_sec, 1);
}
/* Verify negative overflow across all time fields. */
static void timegm_combined_negative_test(void)
{
struct tm time_value = { 0 };
time_value.tm_year = 123;
time_value.tm_mon = -13;
time_value.tm_mday = 1;
time_value.tm_hour = -25;
time_value.tm_min = -61;
time_value.tm_sec = -61;
timegm_assert_consistent("combined negative overflow",
&time_value,
(time_t)1638223079);
uassert_int_equal(time_value.tm_year, 121);
uassert_int_equal(time_value.tm_mon, 10);
uassert_int_equal(time_value.tm_mday, 29);
uassert_int_equal(time_value.tm_hour, 21);
uassert_int_equal(time_value.tm_min, 57);
uassert_int_equal(time_value.tm_sec, 59);
}
/* Initialize the time conversion tests. */
static rt_err_t utest_tc_init(void)
{
return RT_EOK;
}
/* Clean up the time conversion tests. */
static rt_err_t utest_tc_cleanup(void)
{
return RT_EOK;
}
/* Run all time conversion tests in one unit so failures are retained. */
static void timegm_all_test(void)
{
timegm_month_boundary_test();
timegm_leap_year_test();
timegm_large_day_test();
timegm_zero_day_test();
timegm_negative_day_test();
timegm_negative_second_test();
timegm_negative_minute_test();
timegm_negative_hour_test();
timegm_negative_month_test();
timegm_positive_overflow_test();
timegm_combined_negative_test();
}
/* Run the time conversion test case. */
static void testcase(void)
{
UTEST_UNIT_RUN(timegm_all_test);
}
UTEST_TC_EXPORT(testcase, "components.libc.time", utest_tc_init, utest_tc_cleanup, 10);
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