3 /// Conversion between time_t and cenmin_t and back.
4 /// time_t is the POSIX time.
5 /// min1900_t is the minutes from Jan 1, 1900
9 Copyright (C) 2005-2008, Net Direct Inc. (http://www.netdirect.ca/)
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
20 See the GNU General Public License in the COPYING file at the
21 root directory of this project for more details.
24 #ifndef __BARRY_TIME_H__
25 #define __BARRY_TIME_H__
32 // Calculate the number of minutes between Jan 01, 1900 and Jan 01, 1970
34 // There are 17 leap years between 1900 and 1970
35 // (1969-1900) / 4 = 17.25
37 // 1900 itself is not a leap year (not divisible by 400)
39 #define DAY_MINUTES (24 * 60)
40 #define YEAR_MINUTES (365 * DAY_MINUTES)
41 #define LEAP_YEAR_COUNT ((1970-1901) / 4)
42 #define YEAR_COUNT (1970 - 1900)
44 // therefore, the difference between standard C's time and min1900_t's
46 #define STDC_MIN1900_DIFF (YEAR_COUNT * YEAR_MINUTES + LEAP_YEAR_COUNT * DAY_MINUTES)
50 typedef long min1900_t
;
52 BXEXPORT min1900_t
time2min(time_t t
);
53 BXEXPORT
time_t min2time(min1900_t m
);
55 // FIXME - turn TimeZone into a C typedef and wrap this in extern "C"
56 // so the data can be used in both C and C++ libraries
57 struct BXEXPORT TimeZone
60 signed short HourOffset
;
61 signed short MinOffset
;
65 // FIXME - put this somewhere for both C and C++
66 #define TIME_ZONE_CODE_ERR 0xffff
68 BXEXPORT
const TimeZone
* GetTimeZoneTable();
69 BXEXPORT
const TimeZone
* GetTimeZone(unsigned short Code
);
70 BXEXPORT
unsigned short GetTimeZoneCode(signed short HourOffset
,
71 signed short MinOffset
= 0);
73 // Message time conversion stuff
74 BXEXPORT
time_t DayToDate( unsigned short Day
);
75 BXEXPORT
time_t Message2Time(uint16_t r_date
, uint16_t r_time
);