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
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
*
* Structures and functions for:
*
* Calculating day number in Gregorian and Julian proleptic calendars.
* Converting between day numbers and dates in the calendars.
* Converting between different calendars.
* Calculating differences between dates.
*
* Works used in research:
*
* @cite "Calendrical Calculations", Dershowitz and Reingold
* @cite ISO 8601 http://en.wikipedia.org/wiki/ISO_8601
* @cite http://www.ddj.com/hpc-high-performance-computing/197006254
* @cite http://en.wikipedia.org/wiki/Julian_day#Calculation
*/
#ifndef DRIZZLED_CALENDAR_H
#define DRIZZLED_CALENDAR_H
namespace drizzled
{
#ifdef __cplusplus
extern "C" {
#endif
/**
* Different calendars supported by the temporal library
*/
enum calendar
{
GREGORIAN= 1
, JULIAN= 2
, HEBREW= 3
, ISLAM= 4
};
/**
* Calculates the Julian Day Number from the year, month
* and day supplied for a Gregorian Proleptic calendar date.
*
* @note
*
* Year month and day values are assumed to be valid. This
* method does no bounds checking or validation.
*
* @param Year of date
* @param Month of date
* @param Day of date
*/
int64_t julian_day_number_from_gregorian_date(uint32_t year, uint32_t month, uint32_t day);
/**
* Given a supplied Julian Day Number, populates a year, month, and day
* with the date in the Gregorian Proleptic calendar which corresponds to
* the given Julian Day Number.
*
* @param Julian Day Number
* @param Pointer to year to populate
* @param Pointer to month to populate
* @param Pointer to the day to populate
*/
void gregorian_date_from_julian_day_number(int64_t julian_day
, uint32_t *year_out
, uint32_t *month_out
, uint32_t *day_out);
/**
* Returns the number of days in a month, given
* a year and a month in the Gregorian calendar.
*
* @param Year in Gregorian Proleptic calendar
* @param Month in date
*/
uint32_t days_in_gregorian_year_month(uint32_t year, uint32_t month);
/**
* Returns the number of the day in a week.
*
* @see temporal_to_number_days()
*
* Return values:
*
* Day Day Number Sunday first day?
* -------------- ----------- -----------------
* Sunday 0 true
* Monday 1 true
* Tuesday 2 true
* Wednesday 3 true
* Thursday 4 true
* Friday 5 true
* Saturday 6 true
* Sunday 6 false
* Monday 0 false
* Tuesday 1 false
* Wednesday 2 false
* Thursday 3 false
* Friday 4 false
* Saturday 5 false
*
* @param Number of days since start of Gregorian calendar.
* @param Consider Sunday the first day of the week?
*/
uint32_t day_of_week(int64_t day_number, bool sunday_is_first_day_of_week);
/**
* Returns whether the supplied date components are within the
* range of the UNIX epoch.
*
* Times in the range of 1970-01-01T00:00:00 to 2038-01-19T03:14:07
*
* @param Year
* @param Month
* @param Day
* @param Hour
* @param Minute
* @param Second
*/
bool in_unix_epoch_range(uint32_t year
, uint32_t month
, uint32_t day
, uint32_t hour
, uint32_t minute
, uint32_t second);
/**
* Returns the number of the week from a supplied year, month, and
* date in the Gregorian proleptic calendar. We use strftime() and
* the %U, %W, and %V format specifiers depending on the value
* of the sunday_is_first_day_of_week parameter.
*
* @param Subject year
* @param Subject month
* @param Subject day
* @param Is sunday the first day of the week?
* @param Pointer to a uint32_t to hold the resulting year, which
* may be incremented or decremented depending on flags
*/
uint32_t week_number_from_gregorian_date(uint32_t year
, uint32_t month
, uint32_t day
, bool sunday_is_first_day_of_week);
/**
* Returns the ISO week number of a supplied year, month, and
* date in the Gregorian proleptic calendar. We use strftime() and
* the %V format specifier to do the calculation, which yields a
* correct ISO 8601:1988 week number.
*
* The final year_out parameter is a pointer to an integer which will
* be set to the year in which the week belongs, according to ISO8601:1988,
* which may be different from the Gregorian calendar year.
*
* @see http://en.wikipedia.org/wiki/ISO_8601
*
* @param Subject year
* @param Subject month
* @param Subject day
* @param Pointer to a uint32_t to hold the resulting year, which
* may be incremented or decremented depending on flags
*/
uint32_t iso_week_number_from_gregorian_date(uint32_t year
, uint32_t month
, uint32_t day
, uint32_t *year_out);
/**
* Takes a number in the form [YY]YYMM and converts it into
* a number of months.
*
* @param Period in the form [YY]YYMM
*/
uint32_t year_month_to_months(uint32_t year_month);
/**
* Takes a number of months and converts it to
* a period in the form YYYYMM.
*
* @param Number of months
*/
uint32_t months_to_year_month(uint32_t months);
#ifdef __cplusplus
}
#endif
} /* namespace drizzled */
#endif /* DRIZZLED_CALENDAR_H */
|