1 /* date.c - set/get the date
2 *
3 * Copyright 2012 Andre Renaud <[email protected]>
4 *
5 * See http://opengroup.org/onlinepubs/9699919799/utilities/date.html
6 *
7 * Note: setting a 2 year date is 50 years back/forward from today,
8 * not posix's hardwired magic dates.
9
10 USE_DATE(NEWTOY(date, ">1d:D:I(iso-8601):;r:s:u(utc)[!dr]", TOYFLAG_BIN))
11
12 config DATE
13 bool "date"
14 default y
15 help
16 usage: date [-u] [-I RES] [-r FILE] [-d DATE] [+DISPLAY_FORMAT] [-D SET_FORMAT] [SET]
17
18 Set/get the current date/time. With no SET shows the current date.
19
20 -d Show DATE instead of current time (convert date format)
21 -D +FORMAT for SET or -d (instead of MMDDhhmm[[CC]YY][.ss])
22 -I RES ISO 8601 with RESolution d=date/h=hours/m=minutes/s=seconds/n=ns
23 -r Use modification time of FILE instead of current date
24 -s DATE Set the system clock to DATE.
25 -u Use UTC instead of current timezone
26
27 Supported input formats:
28
29 MMDDhhmm[[CC]YY][.ss] POSIX
30 @UNIXTIME[.FRACTION] seconds since midnight 1970-01-01
31 YYYY-MM-DD [hh:mm[:ss]] ISO 8601
32 hh:mm[:ss] 24-hour time today
33
34 All input formats can be followed by fractional seconds, and/or a UTC
35 offset such as -0800.
36
37 All input formats can be preceded by TZ="id" to set the input time zone
38 separately from the output time zone. Otherwise $TZ sets both.
39
40 +FORMAT specifies display format string using strftime(3) syntax:
41
42 %% literal % %n newline %t tab
43 %S seconds (00-60) %M minute (00-59) %m month (01-12)
44 %H hour (0-23) %I hour (01-12) %p AM/PM
45 %y short year (00-99) %Y year %C century
46 %a short weekday name %A weekday name %u day of week (1-7, 1=mon)
47 %b short month name %B month name %Z timezone name
48 %j day of year (001-366) %d day of month (01-31) %e day of month ( 1-31)
49 %N nanosec (output only)
50
51 %U Week of year (0-53 start Sunday) %W Week of year (0-53 start Monday)
52 %V Week of year (1-53 start Monday, week < 4 days not part of this year)
53
54 %F "%Y-%m-%d" %R "%H:%M" %T "%H:%M:%S" %z timezone (-0800)
55 %D "%m/%d/%y" %r "%I:%M:%S %p" %h "%b" %:z timezone (-08:00)
56 %x locale date %X locale time %c locale date/time %s unix epoch time
57 */
58
59 #define FOR_date
60 #include "toys.h"
61
62 GLOBALS(
63 char *s, *r, *I, *D, *d;
64
65 unsigned nano;
66 )
67
68 // Handles any leading `TZ="blah" ` in the input string.
parse_date(char * str,time_t * t)69 static void parse_date(char *str, time_t *t)
70 {
71 char *new_tz = NULL, *old_tz QUIET, *s = str;
72
73 if (!strncmp(str, "TZ=\"", 4)) {
74 // Extract the time zone and skip any whitespace.
75 new_tz = str+4;
76 if (!(str = strchr(new_tz, '"'))) xvali_date(0, s);
77 *str++ = 0;
78 while (isspace(*str)) str++;
79
80 // Switch $TZ.
81 old_tz = getenv("TZ");
82 setenv("TZ", new_tz, 1);
83 tzset();
84 }
85 time(t);
86 xparsedate(str, t, &TT.nano, 1);
87 if (new_tz) {
88 if (old_tz) setenv("TZ", old_tz, 1);
89 else unsetenv("TZ");
90 }
91 }
92
93 // Print strftime plus %N and %:z escape(s). Note: modifies fmt in those cases.
puts_time(char * fmt,struct tm * tm)94 static void puts_time(char *fmt, struct tm *tm)
95 {
96 char *s, *snap, *out;
97
98 for (s = fmt;;s++) {
99 long n = 0;
100
101 // Find next %N/%:z or end of format string.
102 if (*(snap = s)) {
103 if (*s != '%') continue;
104 if (*++s == 'N') n = 9;
105 else if (isdigit(*s) && s[1] == 'N') n = *s++-'0';
106 else if (*s == ':' && s[1] == 'z') s++, n++;
107 else continue;
108 }
109
110 // Only modify input string if needed (default format is constant string).
111 if (*s) *snap = 0;
112 // Do we have any regular work for strftime to do?
113 out = toybuf;
114 if (*fmt) {
115 if (!strftime(out, sizeof(toybuf)-12, fmt, tm))
116 perror_exit("bad format '%s'", fmt);
117 out += strlen(out);
118 }
119 // Do we have any custom formatting to append to that?
120 if (*s == 'N') {
121 sprintf(out, "%09u", TT.nano);
122 out[n] = 0;
123 } else if (*s == 'z') {
124 strftime(out, 10, "%z", tm);
125 memmove(out+4, out+3, strlen(out+3)+1);
126 out[3] = ':';
127 }
128 xputsn(toybuf);
129 if (!*s || !*(fmt = s+1)) break;
130 }
131 xputc('\n');
132 }
133
date_main(void)134 void date_main(void)
135 {
136 char *setdate = *toys.optargs, *format_string = "%a %b %e %H:%M:%S %Z %Y",
137 *tz = NULL;
138 time_t t;
139
140 if (FLAG(I)) {
141 char *iso_formats[] = {"%F","%FT%H%:z","%FT%R%:z","%FT%T%:z","%FT%T,%N%:z"};
142 int i = stridx("dhmsn", (TT.I && *TT.I) ? *TT.I : 'd');
143
144 if (i<0) help_exit("bad -I: %s", TT.I);
145 format_string = xstrdup(iso_formats[i]);
146 }
147
148 if (FLAG(u)) {
149 tz = getenv("TZ");
150 setenv("TZ", "UTC", 1);
151 tzset();
152 }
153
154 if (TT.d) {
155 if (TT.D) {
156 struct tm tm = {};
157 char *s = strptime(TT.d, TT.D+(*TT.D=='+'), &tm);
158
159 t = (s && !*s) ? xvali_date(&tm, s) : xvali_date(0, TT.d);
160 } else parse_date(TT.d, &t);
161 } else {
162 struct timespec ts;
163 struct stat st;
164
165 if (TT.r) {
166 xstat(TT.r, &st);
167 ts = st.st_mtim;
168 } else clock_gettime(CLOCK_REALTIME, &ts);
169
170 t = ts.tv_sec;
171 TT.nano = ts.tv_nsec;
172 }
173
174 if (FLAG(s)) {
175 if (setdate) help_exit("can't set two dates at once");
176 setdate = TT.s;
177 }
178
179 // Fall through to display if no arguments
180 if (!setdate);
181 // Supplying a format argument means display
182 else if (toys.optc && *toys.optargs[0] == '+')
183 format_string = toys.optargs[0]+1;
184
185 // Set the date
186 else {
187 struct timeval tv;
188
189 parse_date(setdate, &t);
190 tv.tv_sec = t;
191 tv.tv_usec = TT.nano/1000;
192 if (settimeofday(&tv, NULL) < 0) perror_msg("cannot set date");
193 }
194
195 puts_time(format_string, localtime(&t));
196
197 if (FLAG(u)) {
198 if (tz) setenv("TZ", tz, 1);
199 else unsetenv("TZ");
200 tzset();
201 }
202 if (CFG_TOYBOX_FREE && FLAG(I)) free(format_string);
203 }
204