2 * Bacula time and date routines -- John Walker
7 Copyright (C) 2000-2003 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 in seconds (time_t, ...)
34 * and is 1 Jan 1970 at 0:0
36 * The major two times that should be left are:
37 * btime_t (64 bit integer in microseconds base Epoch)
38 * utime_t (64 bit integer in seconds base Epoch)
44 void bstrftime(char *dt, int maxlen, utime_t tim)
49 /* ***FIXME**** the format and localtime_r() should be user configurable */
50 localtime_r(&ttime, &tm);
51 strftime(dt, maxlen, "%d-%b-%Y %H:%M", &tm);
54 utime_t str_to_utime(char *str)
59 if (sscanf(str, "%d-%d-%d %d:%d:%d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
60 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) {
68 if (tm.tm_year >= 1900) {
77 return (utime_t)ttime;
80 void get_current_time(struct date_time *dt)
87 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,
88 tm.tm_hour, tm.tm_min, tm.tm_sec);
91 Dmsg2(200, "jday=%f jmin=%f\n", dt->julian_day_number, dt->julian_day_fraction);
93 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,
94 tm.tm_hour, tm.tm_min, tm.tm_sec);
99 * Bacula's time (btime_t) is an unsigned 64 bit integer that contains
100 * the number of microseconds since Epoch Time (1 Jan 1970).
103 btime_t get_current_btime()
106 if (gettimeofday(&tv, NULL) != 0) {
107 tv.tv_sec = (long)time(NULL); /* fall back to old method */
110 return ((btime_t)tv.tv_sec) * 1000000 + (btime_t)tv.tv_usec;
113 /* Convert btime to Unix time */
114 time_t btime_to_unix(btime_t bt)
116 return (time_t)(bt/1000000);
119 /* Convert btime to utime */
120 utime_t btime_to_utime(btime_t bt)
127 /* date_encode -- Encode civil date as a Julian day number. */
129 fdate_t date_encode(uint32_t year, uint8_t month, uint8_t day)
132 /* Algorithm as given in Meeus, Astronomical Algorithms, Chapter 7, page 61 */
138 ASSERT(day > 0 && day < 32);
148 /* Determine whether date is in Julian or Gregorian calendar based on
149 canonical date of calendar reform. */
151 if ((year < 1582) || ((year == 1582) && ((month < 9) || (month == 9 && day < 5)))) {
154 a = ((int) (y / 100));
158 return (((int32_t) (365.25 * (y + 4716))) + ((int) (30.6001 * (m + 1))) +
162 /* time_encode -- Encode time from hours, minutes, and seconds
163 into a fraction of a day. */
165 ftime_t time_encode(uint8_t hour, uint8_t minute, uint8_t second,
166 float32_t second_fraction)
168 ASSERT((second_fraction >= 0.0) || (second_fraction < 1.0));
169 return (ftime_t) (((second + 60L * (minute + 60L * hour)) / 86400.0)) +
173 /* date_time_encode -- Set day number and fraction from date
176 void date_time_encode(struct date_time *dt,
177 uint32_t year, uint8_t month, uint8_t day,
178 uint8_t hour, uint8_t minute, uint8_t second,
179 float32_t second_fraction)
181 dt->julian_day_number = date_encode(year, month, day);
182 dt->julian_day_fraction = time_encode(hour, minute, second, second_fraction);
185 /* date_decode -- Decode a Julian day number into civil date. */
187 void date_decode(fdate_t date, uint32_t *year, uint8_t *month,
190 fdate_t z, f, a, alpha, b, c, d, e;
199 alpha = floor((z - 1867216.25) / 36524.25);
200 a = z + 1 + alpha - floor(alpha / 4);
204 c = floor((b - 122.1) / 365.25);
205 d = floor(365.25 * c);
206 e = floor((b - d) / 30.6001);
208 *day = (uint8_t) (b - d - floor(30.6001 * e) + f);
209 *month = (uint8_t) ((e < 14) ? (e - 1) : (e - 13));
210 *year = (uint32_t) ((*month > 2) ? (c - 4716) : (c - 4715));
213 /* time_decode -- Decode a day fraction into civil time. */
215 void time_decode(ftime_t time, uint8_t *hour, uint8_t *minute,
216 uint8_t *second, float32_t *second_fraction)
220 ij = (uint32_t) ((time - floor(time)) * 86400.0);
221 *hour = (uint8_t) (ij / 3600L);
222 *minute = (uint8_t) ((ij / 60L) % 60L);
223 *second = (uint8_t) (ij % 60L);
224 if (second_fraction != NULL) {
225 *second_fraction = time - floor(time);
229 /* date_time_decode -- Decode a Julian day and day fraction
230 into civil date and time. */
232 void date_time_decode(struct date_time *dt,
233 uint32_t *year, uint8_t *month, uint8_t *day,
234 uint8_t *hour, uint8_t *minute, uint8_t *second,
235 float32_t *second_fraction)
237 date_decode(dt->julian_day_number, year, month, day);
238 time_decode(dt->julian_day_fraction, hour, minute, second, second_fraction);
241 /* tm_encode -- Encode a civil date and time from a tm structure
242 * to a Julian day and day fraction.
245 void tm_encode(struct date_time *dt,
249 uint8_t month, day, hour, minute, second;
251 year = tm->tm_year + 1900;
252 month = tm->tm_mon + 1;
257 dt->julian_day_number = date_encode(year, month, day);
258 dt->julian_day_fraction = time_encode(hour, minute, second, 0.0);
262 /* tm_decode -- Decode a Julian day and day fraction
263 into civil date and time in tm structure */
265 void tm_decode(struct date_time *dt,
269 uint8_t month, day, hour, minute, second;
271 date_decode(dt->julian_day_number, &year, &month, &day);
272 time_decode(dt->julian_day_fraction, &hour, &minute, &second, NULL);
273 tm->tm_year = year - 1900;
274 tm->tm_mon = month - 1;
282 /* date_time_compare -- Compare two dates and times and return
283 the relationship as follows:
290 int date_time_compare(struct date_time *dt1, struct date_time *dt2)
292 if (dt1->julian_day_number == dt2->julian_day_number) {
293 if (dt1->julian_day_fraction == dt2->julian_day_fraction) {
296 return (dt1->julian_day_fraction < dt2->julian_day_fraction) ? -1 : 1;
298 return (dt1->julian_day_number - dt2->julian_day_number) ? -1 : 1;