amiro-os / core / src / aos_time.c @ 57a5d1df
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| 1 | 8399aeae | Thomas Schöpping | /*
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| 2 | AMiRo-OS is an operating system designed for the Autonomous Mini Robot (AMiRo) platform.
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| 3 | 84f0ce9e | Thomas Schöpping | Copyright (C) 2016..2019 Thomas Schöpping et al.
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| 4 | 8399aeae | Thomas Schöpping | |
| 5 | This program is free software: you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation, either version 3 of the License, or
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| 8 | (at your option) any later version.
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| 9 | |||
| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 | |||
| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 17 | */
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| 18 | |||
| 19 | 53710ca3 | Marc Rothmann | /**
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| 20 | * @file aos_time.c
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| 21 | * @brief Time related function implementations.
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| 22 | *
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| 23 | * @addtogroup aos_time
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| 24 | * @{
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| 25 | */
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| 26 | |||
| 27 | 3940ba8a | Thomas Schöpping | #include <amiroos.h> |
| 28 | 8399aeae | Thomas Schöpping | |
| 29 | f3ac1c96 | Thomas Schöpping | /******************************************************************************/
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| 30 | /* LOCAL DEFINITIONS */
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| 31 | /******************************************************************************/
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| 32 | |||
| 33 | /******************************************************************************/
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| 34 | /* EXPORTED VARIABLES */
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| 35 | /******************************************************************************/
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| 36 | |||
| 37 | /******************************************************************************/
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| 38 | /* LOCAL TYPES */
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| 39 | /******************************************************************************/
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| 40 | |||
| 41 | /******************************************************************************/
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| 42 | /* LOCAL VARIABLES */
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| 43 | /******************************************************************************/
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| 44 | |||
| 45 | /******************************************************************************/
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| 46 | /* LOCAL FUNCTIONS */
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| 47 | /******************************************************************************/
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| 48 | |||
| 49 | /******************************************************************************/
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| 50 | /* EXPORTED FUNCTIONS */
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| 51 | /******************************************************************************/
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| 52 | 8399aeae | Thomas Schöpping | |
| 53 | /**
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| 54 | * @brief Calculates the day of week from a specified date.
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| 55 | *
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| 56 | * @param[in] day The day of the date.
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| 57 | * @param[in] month The month of the daste.
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| 58 | * @param[in] year The year of the date.
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| 59 | *
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| 60 | * @return The day of week depending on the date represented in ISO format (1 = Monday to 7 = Sunday).
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| 61 | */
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| 62 | uint8_t aosTimeDayOfWeekFromDate(const uint16_t day, const uint8_t month, const uint16_t year) |
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| 63 | {
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| 64 | aosDbgCheck(day >= 1 && day <= 31); |
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| 65 | aosDbgCheck(month >= 1 && month <= 12); |
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| 66 | |||
| 67 | /*
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| 68 | * Implementation of Zeller's congruence for Gregorian calender.
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| 69 | * See https://en.wikipedia.org/wiki/Zeller%27s_congruence for details.
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| 70 | */
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| 71 | const uint32_t q = day;
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| 72 | const uint32_t m = (month >= 3) ? month : month + 12; |
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| 73 | const uint32_t K = year % 100; |
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| 74 | const uint32_t J = year / 100; |
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| 75 | |||
| 76 | const uint32_t h = (q + ((13 * (m + 1)) / 5) + K + (K / 4) + (J / 4) - (2 * J)) % 7; |
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| 77 | |||
| 78 | return ((h + 5) % 7) + 1; |
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| 79 | } |
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| 80 | 53710ca3 | Marc Rothmann | |
| 81 | /** @} */ |