amiro-os / core / src / aos_time.c @ 881a7932
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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 | Copyright (C) 2016..2018 Thomas Schöpping et al.
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4 | |||
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 | 8399aeae | Thomas Schöpping | #include <aos_time.h> |
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29 | #include <aos_debug.h> |
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30 | #include <aos_system.h> |
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31 | |||
32 | /**
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33 | * @brief Calculates the day of week from a specified date.
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34 | *
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35 | * @param[in] day The day of the date.
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36 | * @param[in] month The month of the daste.
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37 | * @param[in] year The year of the date.
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38 | *
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39 | * @return The day of week depending on the date represented in ISO format (1 = Monday to 7 = Sunday).
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40 | */
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41 | uint8_t aosTimeDayOfWeekFromDate(const uint16_t day, const uint8_t month, const uint16_t year) |
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42 | { |
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43 | aosDbgCheck(day >= 1 && day <= 31); |
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44 | aosDbgCheck(month >= 1 && month <= 12); |
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45 | |||
46 | /*
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47 | * Implementation of Zeller's congruence for Gregorian calender.
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48 | * See https://en.wikipedia.org/wiki/Zeller%27s_congruence for details.
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49 | */
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50 | const uint32_t q = day;
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51 | const uint32_t m = (month >= 3) ? month : month + 12; |
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52 | const uint32_t K = year % 100; |
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53 | const uint32_t J = year / 100; |
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54 | |||
55 | const uint32_t h = (q + ((13 * (m + 1)) / 5) + K + (K / 4) + (J / 4) - (2 * J)) % 7; |
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56 | |||
57 | return ((h + 5) % 7) + 1; |
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58 | } |
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59 | 53710ca3 | Marc Rothmann | |
60 | /** @} */ |