2 * Bacula time and date routines -- John Walker
7 Copyright (C) 2000, 2001, 2002 Kern Sibbald and John Walker
9 This program is free software; you can redistribute it and/or
10 modify it under the terms of the GNU General Public License as
11 published by the Free Software Foundation; either version 2 of
12 the License, or (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 General Public License for more details.
19 You should have received a copy of the GNU General Public
20 License along with this program; if not, write to the Free
21 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
27 /* Concerning times. There are a number of differnt time standards
28 * in Bacula (fdate_t, ftime_t, time_t (Unix standard), btime_t, and
29 * utime_t). fdate_t and ftime_t are deprecated and should no longer
30 * be used, and in general, Unix time time_t should no longer be used,
31 * it is being phased out.
33 * Epoch is the base of Unix time (time_t, ...) and is 1 Jan 1970 at 0:0
35 * The major two times that should be left are:
36 * btime_t (64 bit integer in microseconds base Epoch)
37 * utime_t (64 bit integer in seconds base Epoch)
43 void bstrftime(char *dt, int maxlen, utime_t tim)
48 /* ***FIXME**** the format and localtime_r() should be user configurable */
49 localtime_r(&ttime, &tm);
50 strftime(dt, maxlen, "%d-%b-%Y %H:%M", &tm);
53 utime_t str_to_utime(char *str)
57 if (sscanf(str, "%d-%d-%d %d:%d:%d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
58 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) {
66 if (tm.tm_year >= 1900) {
70 return (utime_t)mktime(&tm);
73 void get_current_time(struct date_time *dt)
80 Dmsg6(200, "m=%d d=%d y=%d h=%d m=%d s=%d\n", tm.tm_mon+1, tm.tm_mday, tm.tm_year+1900,
81 tm.tm_hour, tm.tm_min, tm.tm_sec);
84 Dmsg2(200, "jday=%f jmin=%f\n", dt->julian_day_number, dt->julian_day_fraction);
86 Dmsg6(200, "m=%d d=%d y=%d h=%d m=%d s=%d\n", tm.tm_mon+1, tm.tm_mday, tm.tm_year+1900,
87 tm.tm_hour, tm.tm_min, tm.tm_sec);
92 * Bacula's time (btime_t) is an unsigned 64 bit integer that contains
93 * the number of microseconds since Epoch Time (1 Jan 1970).
96 btime_t get_current_btime()
99 if (gettimeofday(&tv, NULL) != 0) {
100 tv.tv_sec = (long)time(NULL); /* fall back to old method */
103 return ((btime_t)tv.tv_sec) * 1000000 + (btime_t)tv.tv_usec;
106 /* Convert btime to Unix time */
107 time_t btime_to_unix(btime_t bt)
109 return (time_t)(bt/1000000);
112 /* Convert btime to utime */
113 utime_t btime_to_utime(btime_t bt)
120 /* date_encode -- Encode civil date as a Julian day number. */
122 fdate_t date_encode(uint32_t year, uint8_t month, uint8_t day)
125 /* Algorithm as given in Meeus, Astronomical Algorithms, Chapter 7, page 61 */
131 ASSERT(day > 0 && day < 32);
141 /* Determine whether date is in Julian or Gregorian calendar based on
142 canonical date of calendar reform. */
144 if ((year < 1582) || ((year == 1582) && ((month < 9) || (month == 9 && day < 5)))) {
147 a = ((int) (y / 100));
151 return (((int32_t) (365.25 * (y + 4716))) + ((int) (30.6001 * (m + 1))) +
155 /* time_encode -- Encode time from hours, minutes, and seconds
156 into a fraction of a day. */
158 ftime_t time_encode(uint8_t hour, uint8_t minute, uint8_t second,
159 float32_t second_fraction)
161 ASSERT((second_fraction >= 0.0) || (second_fraction < 1.0));
162 return (ftime_t) (((second + 60L * (minute + 60L * hour)) / 86400.0)) +
166 /* date_time_encode -- Set day number and fraction from date
169 void date_time_encode(struct date_time *dt,
170 uint32_t year, uint8_t month, uint8_t day,
171 uint8_t hour, uint8_t minute, uint8_t second,
172 float32_t second_fraction)
174 dt->julian_day_number = date_encode(year, month, day);
175 dt->julian_day_fraction = time_encode(hour, minute, second, second_fraction);
178 /* date_decode -- Decode a Julian day number into civil date. */
180 void date_decode(fdate_t date, uint32_t *year, uint8_t *month,
183 fdate_t z, f, a, alpha, b, c, d, e;
192 alpha = floor((z - 1867216.25) / 36524.25);
193 a = z + 1 + alpha - floor(alpha / 4);
197 c = floor((b - 122.1) / 365.25);
198 d = floor(365.25 * c);
199 e = floor((b - d) / 30.6001);
201 *day = (uint8_t) (b - d - floor(30.6001 * e) + f);
202 *month = (uint8_t) ((e < 14) ? (e - 1) : (e - 13));
203 *year = (uint32_t) ((*month > 2) ? (c - 4716) : (c - 4715));
206 /* time_decode -- Decode a day fraction into civil time. */
208 void time_decode(ftime_t time, uint8_t *hour, uint8_t *minute,
209 uint8_t *second, float32_t *second_fraction)
213 ij = (uint32_t) ((time - floor(time)) * 86400.0);
214 *hour = (uint8_t) (ij / 3600L);
215 *minute = (uint8_t) ((ij / 60L) % 60L);
216 *second = (uint8_t) (ij % 60L);
217 if (second_fraction != NULL) {
218 *second_fraction = time - floor(time);
222 /* date_time_decode -- Decode a Julian day and day fraction
223 into civil date and time. */
225 void date_time_decode(struct date_time *dt,
226 uint32_t *year, uint8_t *month, uint8_t *day,
227 uint8_t *hour, uint8_t *minute, uint8_t *second,
228 float32_t *second_fraction)
230 date_decode(dt->julian_day_number, year, month, day);
231 time_decode(dt->julian_day_fraction, hour, minute, second, second_fraction);
234 /* tm_encode -- Encode a civil date and time from a tm structure
235 * to a Julian day and day fraction.
238 void tm_encode(struct date_time *dt,
242 uint8_t month, day, hour, minute, second;
244 year = tm->tm_year + 1900;
245 month = tm->tm_mon + 1;
250 dt->julian_day_number = date_encode(year, month, day);
251 dt->julian_day_fraction = time_encode(hour, minute, second, 0.0);
255 /* tm_decode -- Decode a Julian day and day fraction
256 into civil date and time in tm structure */
258 void tm_decode(struct date_time *dt,
262 uint8_t month, day, hour, minute, second;
264 date_decode(dt->julian_day_number, &year, &month, &day);
265 time_decode(dt->julian_day_fraction, &hour, &minute, &second, NULL);
266 tm->tm_year = year - 1900;
267 tm->tm_mon = month - 1;
275 /* date_time_compare -- Compare two dates and times and return
276 the relationship as follows:
283 int date_time_compare(struct date_time *dt1, struct date_time *dt2)
285 if (dt1->julian_day_number == dt2->julian_day_number) {
286 if (dt1->julian_day_fraction == dt2->julian_day_fraction) {
289 return (dt1->julian_day_fraction < dt2->julian_day_fraction) ? -1 : 1;
291 return (dt1->julian_day_number - dt2->julian_day_number) ? -1 : 1;