amiro-os / core / src / aos_time.c @ 7de0cc90
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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 | /** @} */ |