1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
/*
* Copyright (c) 2016-2022 Bouffalolab.
*
* This file is part of
* *** Bouffalolab Software Dev Kit ***
* (see www.bouffalolab.com).
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of Bouffalo Lab nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdlib.h>
#include <utils_time.h>
//Thu=4, Fri=5, Sat=6, Sun=0, Mon=1, Tue=2, Wed=3
int utils_time_date_from_epoch(unsigned int epoch, utils_time_date_t *date)
{
int i;
unsigned short temp_days;
unsigned char month_days[12]={31,28,31,30,31,30,31,31,30,31,30,31};
unsigned char week_days[7] = {4,5,6,0,1,2,3};
date->leap_days = 0;
date->leap_year_ind = 0;
// Add or substract time zone here.
//epoch += 19800; //GMT +5:30 = +19800 seconds
date->ntp_second = epoch%60;
epoch /= 60;
date->ntp_minute = epoch%60;
epoch /= 60;
date->ntp_hour = epoch%24;
epoch /= 24;
date->days_since_epoch = epoch; //number of days since epoch
date->ntp_week_day = week_days[date->days_since_epoch%7]; //Calculating WeekDay
date->ntp_year = 1970 + (date->days_since_epoch/365); // ball parking year, may not be accurate!
for (i = 1972, date->leap_days = 0; i < date->ntp_year; i+=4) {
// Calculating number of leap days since epoch/1970
if(((i%4==0) && (i%100!=0)) || (i%400==0)) {
date->leap_days++;
}
}
date->ntp_year = 1970 + ((date->days_since_epoch - date->leap_days)/365); // Calculating accurate current year by (days_since_epoch - extra leap days)
if (((date->ntp_year%4==0) && (date->ntp_year%100!=0)) || (date->ntp_year%400==0)) {
month_days[1]=29; //February = 29 days for leap years
date->leap_year_ind = 1; //if current year is leap, set indicator to 1
} else {
month_days[1]=28; //February = 28 days for non-leap years
date->leap_year_ind = 0; //if current year is leap, set indicator to 1
}
for (i = 1972, date->leap_days = 0; i < date->ntp_year; i+=4) {
// Calculating number of leap days since epoch/1970
if(((i%4==0) && (i%100!=0)) || (i%400==0)) {
date->leap_days++;
}
}
date->day_of_year = date->days_since_epoch - date->leap_days - (date->ntp_year - 1970) * 365 + 1;
temp_days = 0;
for (date->ntp_month = 0; date->ntp_month <= 11; date->ntp_month++) {
//calculating current Month
if (date->day_of_year <= temp_days) {
break;
}
temp_days = temp_days + month_days[date->ntp_month];
}
temp_days = temp_days - month_days[date->ntp_month-1]; //calculating current Date
date->ntp_date = date->day_of_year - temp_days;
return 0;
}
|
