138 lines
4.3 KiB
C
138 lines
4.3 KiB
C
/**
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* @file timestamp.c
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* @brief
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*
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* Copyright (c) 2021 Bouffalolab team
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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*/
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#include "timestamp.h"
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#include "misc.h"
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#define FOUR_YEAR_DAY ((365 << 2) + 1) //The total number of days in a 4-year cycle
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#define TIMEZONE (8) //Beijing time Zone adjustment
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#define SEC_NUM_PER_DAY (24 * 60 * 60)
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#define SEC_NUM_PER_HOUR (60 * 60)
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#define SEC_NUM_PER_MINUTE (60)
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static uint8_t month_day[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; //平年
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static uint8_t Leap_month_day[12] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; //闰年
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/**
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* @bref judge if it is a leap year
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* @para year to be judge
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* @return 1：leap year 0： nonleap year
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*/
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bool check_leap_year(uint16_t year)
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{
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if (year % 4) {
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return false;
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} else {
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if ((year % 100 == 0) && (year % 400 != 0)) {
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return false;
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} else {
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return true;
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}
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}
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}
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void cal_weekday(rtc_time *beijing_time)
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{
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uint32_t y,m,d,w;
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y=beijing_time->year;
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m=beijing_time->month;
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d=beijing_time->day;
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if((m==1)||(m==2))
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{
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m+=12;
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y--;
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}
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/*
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把一月和二月看成是上一年的十三月和十四月，例：如果是2004-1-10则换算成：2003-13-10来代入公式计算。
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以公元元年为参考，公元元年1月1日为星期一</PRE><PRE>程序如下：
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利用基姆拉尔森计算日期公式 w=(d+2*m+3*(m+1)/5+y+y/4-y/100+y/400)
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*/
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w=(d+2*m+3*(m+1)/5+y+y/4-y/100+y/400+1)%7;
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beijing_time->week=(uint8_t)w;
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}
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void unixtime2bejingtime(uint32_t unixtime, rtc_time *beijing_time)
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{
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uint32_t totle_day_num;
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uint32_t current_sec_num;
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uint16_t remain_day;
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uint16_t temp_year;
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uint8_t *p = NULL;
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totle_day_num = unixtime / SEC_NUM_PER_DAY; //The total number of days
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current_sec_num = unixtime % SEC_NUM_PER_DAY; //The number of seconds this day
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/* use the number of seconds this day, To calculate hour\minute\second */
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beijing_time->hour = current_sec_num / SEC_NUM_PER_HOUR;
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beijing_time->minute = (current_sec_num % SEC_NUM_PER_HOUR) / SEC_NUM_PER_MINUTE;
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beijing_time->second = (current_sec_num % SEC_NUM_PER_HOUR) % SEC_NUM_PER_MINUTE;
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/* Adjust the time zone and check whether the date is +1 */
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beijing_time->hour += 8;
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if (beijing_time->hour > 23) {
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beijing_time->hour -= 24;
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totle_day_num++;
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}
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/* calculate year */
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beijing_time->year = 1970 + (totle_day_num / FOUR_YEAR_DAY) * 4; // 4-year as a cycle
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remain_day = totle_day_num % FOUR_YEAR_DAY; //remaining day nym( < 4 year )
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/* calculate year & day */
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temp_year = check_leap_year(beijing_time->year) ? 366 : 365;
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while (remain_day >= temp_year) {
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beijing_time->year++;
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remain_day -= temp_year;
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temp_year = check_leap_year(beijing_time->year) ? 366 : 365;
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}
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/* Calculate specific dates(month\day)*/
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p = check_leap_year(beijing_time->year) ? Leap_month_day : month_day;
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remain_day++; //The actual day starts at 1
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beijing_time->month = 0;
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while (remain_day > *(p + beijing_time->month)) {
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remain_day -= *(p + beijing_time->month);
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beijing_time->month++;
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}
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beijing_time->month++; //The actual month starts at 1
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beijing_time->day = remain_day;
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/*利用基姆拉尔森计算日期公式 w=(d+2*m+3*(m+1)/5+y+y/4-y/100+y/400)*/
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beijing_time->week = beijing_time->day + 2*beijing_time->month + 3*(beijing_time->month+1)/5 + \
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beijing_time->year + beijing_time->year/4 - beijing_time->year/100 +beijing_time->year/400 ;
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cal_weekday(beijing_time);
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}
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