1/* GLIB - Library of useful routines for C programming
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
16 */
17
18/*
19 * Modified by the GLib Team and others 1997-2000. See the AUTHORS
20 * file for a list of people on the GLib Team. See the ChangeLog
21 * files for a list of changes. These files are distributed with
22 * GLib at ftp://ftp.gtk.org/pub/gtk/.
23 */
24
25#ifndef __G_DATE_H__
26#define __G_DATE_H__
27
28#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
29#error "Only <glib.h> can be included directly."
30#endif
31
32#include <time.h>
33
34#include <glib/gtypes.h>
35#include <glib/gquark.h>
36
37G_BEGIN_DECLS
38
39/* GDate
40 *
41 * Date calculations (not time for now, to be resolved). These are a
42 * mutant combination of Steffen Beyer's DateCalc routines
43 * (http://www.perl.com/CPAN/authors/id/STBEY/) and Jon Trowbridge's
44 * date routines (written for in-house software). Written by Havoc
45 * Pennington <hp@pobox.com>
46 */
47
48typedef gint32 GTime;
49typedef guint16 GDateYear;
50typedef guint8 GDateDay; /* day of the month */
51typedef struct _GDate GDate;
52
53/* enum used to specify order of appearance in parsed date strings */
54typedef enum
55{
56 G_DATE_DAY = 0,
57 G_DATE_MONTH = 1,
58 G_DATE_YEAR = 2
59} GDateDMY;
60
61/* actual week and month values */
62typedef enum
63{
64 G_DATE_BAD_WEEKDAY = 0,
65 G_DATE_MONDAY = 1,
66 G_DATE_TUESDAY = 2,
67 G_DATE_WEDNESDAY = 3,
68 G_DATE_THURSDAY = 4,
69 G_DATE_FRIDAY = 5,
70 G_DATE_SATURDAY = 6,
71 G_DATE_SUNDAY = 7
72} GDateWeekday;
73typedef enum
74{
75 G_DATE_BAD_MONTH = 0,
76 G_DATE_JANUARY = 1,
77 G_DATE_FEBRUARY = 2,
78 G_DATE_MARCH = 3,
79 G_DATE_APRIL = 4,
80 G_DATE_MAY = 5,
81 G_DATE_JUNE = 6,
82 G_DATE_JULY = 7,
83 G_DATE_AUGUST = 8,
84 G_DATE_SEPTEMBER = 9,
85 G_DATE_OCTOBER = 10,
86 G_DATE_NOVEMBER = 11,
87 G_DATE_DECEMBER = 12
88} GDateMonth;
89
90#define G_DATE_BAD_JULIAN 0U
91#define G_DATE_BAD_DAY 0U
92#define G_DATE_BAD_YEAR 0U
93
94/* Note: directly manipulating structs is generally a bad idea, but
95 * in this case it's an *incredibly* bad idea, because all or part
96 * of this struct can be invalid at any given time. Use the functions,
97 * or you will get hosed, I promise.
98 */
99struct _GDate
100{
101 guint julian_days : 32; /* julian days representation - we use a
102 * bitfield hoping that 64 bit platforms
103 * will pack this whole struct in one big
104 * int
105 */
106
107 guint julian : 1; /* julian is valid */
108 guint dmy : 1; /* dmy is valid */
109
110 /* DMY representation */
111 guint day : 6;
112 guint month : 4;
113 guint year : 16;
114};
115
116/* g_date_new() returns an invalid date, you then have to _set() stuff
117 * to get a usable object. You can also allocate a GDate statically,
118 * then call g_date_clear() to initialize.
119 */
120GLIB_AVAILABLE_IN_ALL
121GDate* g_date_new (void);
122GLIB_AVAILABLE_IN_ALL
123GDate* g_date_new_dmy (GDateDay day,
124 GDateMonth month,
125 GDateYear year);
126GLIB_AVAILABLE_IN_ALL
127GDate* g_date_new_julian (guint32 julian_day);
128GLIB_AVAILABLE_IN_ALL
129void g_date_free (GDate *date);
130
131/* check g_date_valid() after doing an operation that might fail, like
132 * _parse. Almost all g_date operations are undefined on invalid
133 * dates (the exceptions are the mutators, since you need those to
134 * return to validity).
135 */
136GLIB_AVAILABLE_IN_ALL
137gboolean g_date_valid (const GDate *date);
138GLIB_AVAILABLE_IN_ALL
139gboolean g_date_valid_day (GDateDay day) G_GNUC_CONST;
140GLIB_AVAILABLE_IN_ALL
141gboolean g_date_valid_month (GDateMonth month) G_GNUC_CONST;
142GLIB_AVAILABLE_IN_ALL
143gboolean g_date_valid_year (GDateYear year) G_GNUC_CONST;
144GLIB_AVAILABLE_IN_ALL
145gboolean g_date_valid_weekday (GDateWeekday weekday) G_GNUC_CONST;
146GLIB_AVAILABLE_IN_ALL
147gboolean g_date_valid_julian (guint32 julian_date) G_GNUC_CONST;
148GLIB_AVAILABLE_IN_ALL
149gboolean g_date_valid_dmy (GDateDay day,
150 GDateMonth month,
151 GDateYear year) G_GNUC_CONST;
152
153GLIB_AVAILABLE_IN_ALL
154GDateWeekday g_date_get_weekday (const GDate *date);
155GLIB_AVAILABLE_IN_ALL
156GDateMonth g_date_get_month (const GDate *date);
157GLIB_AVAILABLE_IN_ALL
158GDateYear g_date_get_year (const GDate *date);
159GLIB_AVAILABLE_IN_ALL
160GDateDay g_date_get_day (const GDate *date);
161GLIB_AVAILABLE_IN_ALL
162guint32 g_date_get_julian (const GDate *date);
163GLIB_AVAILABLE_IN_ALL
164guint g_date_get_day_of_year (const GDate *date);
165/* First monday/sunday is the start of week 1; if we haven't reached
166 * that day, return 0. These are not ISO weeks of the year; that
167 * routine needs to be added.
168 * these functions return the number of weeks, starting on the
169 * corrsponding day
170 */
171GLIB_AVAILABLE_IN_ALL
172guint g_date_get_monday_week_of_year (const GDate *date);
173GLIB_AVAILABLE_IN_ALL
174guint g_date_get_sunday_week_of_year (const GDate *date);
175GLIB_AVAILABLE_IN_ALL
176guint g_date_get_iso8601_week_of_year (const GDate *date);
177
178/* If you create a static date struct you need to clear it to get it
179 * in a sane state before use. You can clear a whole array at
180 * once with the ndates argument.
181 */
182GLIB_AVAILABLE_IN_ALL
183void g_date_clear (GDate *date,
184 guint n_dates);
185
186/* The parse routine is meant for dates typed in by a user, so it
187 * permits many formats but tries to catch common typos. If your data
188 * needs to be strictly validated, it is not an appropriate function.
189 */
190GLIB_AVAILABLE_IN_ALL
191void g_date_set_parse (GDate *date,
192 const gchar *str);
193GLIB_AVAILABLE_IN_ALL
194void g_date_set_time_t (GDate *date,
195 time_t timet);
196GLIB_AVAILABLE_IN_ALL
197void g_date_set_time_val (GDate *date,
198 GTimeVal *timeval);
199#ifndef G_DISABLE_DEPRECATED
200GLIB_DEPRECATED_FOR(g_date_set_time_t)
201void g_date_set_time (GDate *date,
202 GTime time_);
203#endif
204GLIB_AVAILABLE_IN_ALL
205void g_date_set_month (GDate *date,
206 GDateMonth month);
207GLIB_AVAILABLE_IN_ALL
208void g_date_set_day (GDate *date,
209 GDateDay day);
210GLIB_AVAILABLE_IN_ALL
211void g_date_set_year (GDate *date,
212 GDateYear year);
213GLIB_AVAILABLE_IN_ALL
214void g_date_set_dmy (GDate *date,
215 GDateDay day,
216 GDateMonth month,
217 GDateYear y);
218GLIB_AVAILABLE_IN_ALL
219void g_date_set_julian (GDate *date,
220 guint32 julian_date);
221GLIB_AVAILABLE_IN_ALL
222gboolean g_date_is_first_of_month (const GDate *date);
223GLIB_AVAILABLE_IN_ALL
224gboolean g_date_is_last_of_month (const GDate *date);
225
226/* To go forward by some number of weeks just go forward weeks*7 days */
227GLIB_AVAILABLE_IN_ALL
228void g_date_add_days (GDate *date,
229 guint n_days);
230GLIB_AVAILABLE_IN_ALL
231void g_date_subtract_days (GDate *date,
232 guint n_days);
233
234/* If you add/sub months while day > 28, the day might change */
235GLIB_AVAILABLE_IN_ALL
236void g_date_add_months (GDate *date,
237 guint n_months);
238GLIB_AVAILABLE_IN_ALL
239void g_date_subtract_months (GDate *date,
240 guint n_months);
241
242/* If it's feb 29, changing years can move you to the 28th */
243GLIB_AVAILABLE_IN_ALL
244void g_date_add_years (GDate *date,
245 guint n_years);
246GLIB_AVAILABLE_IN_ALL
247void g_date_subtract_years (GDate *date,
248 guint n_years);
249GLIB_AVAILABLE_IN_ALL
250gboolean g_date_is_leap_year (GDateYear year) G_GNUC_CONST;
251GLIB_AVAILABLE_IN_ALL
252guint8 g_date_get_days_in_month (GDateMonth month,
253 GDateYear year) G_GNUC_CONST;
254GLIB_AVAILABLE_IN_ALL
255guint8 g_date_get_monday_weeks_in_year (GDateYear year) G_GNUC_CONST;
256GLIB_AVAILABLE_IN_ALL
257guint8 g_date_get_sunday_weeks_in_year (GDateYear year) G_GNUC_CONST;
258
259/* Returns the number of days between the two dates. If date2 comes
260 before date1, a negative value is return. */
261GLIB_AVAILABLE_IN_ALL
262gint g_date_days_between (const GDate *date1,
263 const GDate *date2);
264
265/* qsort-friendly (with a cast...) */
266GLIB_AVAILABLE_IN_ALL
267gint g_date_compare (const GDate *lhs,
268 const GDate *rhs);
269GLIB_AVAILABLE_IN_ALL
270void g_date_to_struct_tm (const GDate *date,
271 struct tm *tm);
272
273GLIB_AVAILABLE_IN_ALL
274void g_date_clamp (GDate *date,
275 const GDate *min_date,
276 const GDate *max_date);
277
278/* Swap date1 and date2's values if date1 > date2. */
279GLIB_AVAILABLE_IN_ALL
280void g_date_order (GDate *date1, GDate *date2);
281
282/* Just like strftime() except you can only use date-related formats.
283 * Using a time format is undefined.
284 */
285GLIB_AVAILABLE_IN_ALL
286gsize g_date_strftime (gchar *s,
287 gsize slen,
288 const gchar *format,
289 const GDate *date);
290
291#ifndef G_DISABLE_DEPRECATED
292
293#define g_date_weekday g_date_get_weekday
294#define g_date_month g_date_get_month
295#define g_date_year g_date_get_year
296#define g_date_day g_date_get_day
297#define g_date_julian g_date_get_julian
298#define g_date_day_of_year g_date_get_day_of_year
299#define g_date_monday_week_of_year g_date_get_monday_week_of_year
300#define g_date_sunday_week_of_year g_date_get_sunday_week_of_year
301#define g_date_days_in_month g_date_get_days_in_month
302#define g_date_monday_weeks_in_year g_date_get_monday_weeks_in_year
303#define g_date_sunday_weeks_in_year g_date_get_sunday_weeks_in_year
304
305#endif /* G_DISABLE_DEPRECATED */
306
307G_END_DECLS
308
309#endif /* __G_DATE_H__ */
310