libs/date.cpp

   1 /* Quarn OS
   2  *
   3  * Date
   4  *
   5  * Copyright (C) 2008-2009 Pawel Dziepak
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  */
  22
  23 #include "date.h"
  24
  25 date::date() : timestamp(-1) {}
  26
  27 int months[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 0 };
  28
  29 date::date(int ts) {
  30         timestamp = ts / (24 * 60 * 60);
  31 }
  32
  33 date::date(int day, int month, int year) {
  34         timestamp = (year - 1970) * 365;
  35         for (; month - 1 > 0; month--)
  36                 timestamp += months[month - 1];
  37         timestamp += day + (year - 1970) / 4;
  38 }
  39
  40 date::operator int() {
  41         return timestamp * 24 * 60 * 60;
  42 }
  43
  44 int date::get_year() const {
  45         return 1970 + (timestamp + timestamp / 365 / 4)/ 365;
  46 }
  47
  48 int date::get_month() const {
  49         int month = 0;
  50         if (get_year() % 4 == 0)
  51                 months[1]++;
  52
  53         for (int i = 0, ts = (timestamp - timestamp / 365 / 4) % 365; ts >= months[i]; i++) {
  54                 month++;
  55                 ts -= months[i];
  56         }
  57
  58         if (get_year() % 4 == 0)
  59                 months[1]--;
  60
  61         return month + 1;
  62 }
  63
  64 int date::get_day() const {
  65         int month = 0;
  66         if (get_year() % 4 == 0)
  67                 months[1]++;
  68         int ts = (timestamp  - (timestamp / 365 + 2) / 4) % 365;
  69         for (int i = 0; ts >= months[i]; i++) {
  70                 month++;
  71                 ts -= months[i];
  72         }
  73
  74         if (get_year() % 4 == 0)
  75                 months[1]--;
  76         _ts = ts;
  77
  78         return ts + 1;
  79 }
  80
  81 time::time() : timestamp(-1) {}
  82
  83 time::time(int ts) {
  84         timestamp = ts % (24 * 60 * 60);
  85 }
  86
  87 time::time(int hour, int minute, int second) {
  88         timestamp = hour * 3600 + minute * 60 + second;
  89 }
  90
  91 time::operator int() {
  92         return timestamp;
  93 }
  94
  95 int time::get_second() const {
  96         return timestamp % 60;
  97 }
  98
  99 int time::get_minute() const {
 100         return timestamp / 60 % 60;
 101 }
 102
 103 int time::get_hour() const {
 104         return timestamp / 3600;
 105 }