File | /usr/local/lib/perl5/5.10.1/Time/Local.pm |
Statements Executed | 50 |
Statement Execution Time | 21.1ms |
Calls | P | F | Exclusive Time |
Inclusive Time |
Subroutine |
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1 | 1 | 1 | 24µs | 29µs | _daygm | Time::Local::
1 | 1 | 1 | 20µs | 73µs | BEGIN@4 | Time::Local::
1 | 1 | 1 | 11µs | 27µs | BEGIN@5 | Time::Local::
1 | 1 | 1 | 9µs | 60µs | BEGIN@28 | Time::Local::
1 | 1 | 1 | 8µs | 10µs | BEGIN@7 | Time::Local::
1 | 1 | 1 | 6µs | 30µs | BEGIN@30 | Time::Local::
1 | 1 | 1 | 6µs | 62µs | BEGIN@9 | Time::Local::
1 | 1 | 1 | 6µs | 8µs | BEGIN@6 | Time::Local::
1 | 1 | 1 | 5µs | 30µs | BEGIN@29 | Time::Local::
1 | 1 | 2 | 5µs | 5µs | CORE:pack (opcode) | Time::Local::
0 | 0 | 0 | 0s | 0s | _is_leap_year | Time::Local::
0 | 0 | 0 | 0s | 0s | _timegm | Time::Local::
0 | 0 | 0 | 0s | 0s | timegm | Time::Local::
0 | 0 | 0 | 0s | 0s | timegm_nocheck | Time::Local::
0 | 0 | 0 | 0s | 0s | timelocal | Time::Local::
0 | 0 | 0 | 0s | 0s | timelocal_nocheck | Time::Local::
Line | State ments |
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Calls | Time in subs |
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1 | package Time::Local; | ||||
2 | |||||
3 | 1 | 2µs | require Exporter; | ||
4 | 3 | 26µs | 2 | 127µs | # spent 73µs (20+54) within Time::Local::BEGIN@4 which was called
# once (20µs+54µs) by LWP::UserAgent::BEGIN@12 at line 4 # spent 73µs making 1 call to Time::Local::BEGIN@4
# spent 54µs making 1 call to Exporter::import |
5 | 3 | 22µs | 2 | 42µs | # spent 27µs (11+16) within Time::Local::BEGIN@5 which was called
# once (11µs+16µs) by LWP::UserAgent::BEGIN@12 at line 5 # spent 27µs making 1 call to Time::Local::BEGIN@5
# spent 16µs making 1 call to Config::import |
6 | 3 | 17µs | 2 | 11µs | # spent 8µs (6+2) within Time::Local::BEGIN@6 which was called
# once (6µs+2µs) by LWP::UserAgent::BEGIN@12 at line 6 # spent 8µs making 1 call to Time::Local::BEGIN@6
# spent 2µs making 1 call to strict::import |
7 | 3 | 24µs | 2 | 13µs | # spent 10µs (8+3) within Time::Local::BEGIN@7 which was called
# once (8µs+3µs) by LWP::UserAgent::BEGIN@12 at line 7 # spent 10µs making 1 call to Time::Local::BEGIN@7
# spent 2µs making 1 call to integer::import |
8 | |||||
9 | 3 | 82µs | 2 | 119µs | # spent 62µs (6+56) within Time::Local::BEGIN@9 which was called
# once (6µs+56µs) by LWP::UserAgent::BEGIN@12 at line 9 # spent 62µs making 1 call to Time::Local::BEGIN@9
# spent 56µs making 1 call to vars::import |
10 | 1 | 2µs | $VERSION = '1.1901'; | ||
11 | |||||
12 | 1 | 21µs | @ISA = qw( Exporter ); | ||
13 | 1 | 2µs | @EXPORT = qw( timegm timelocal ); | ||
14 | 1 | 1µs | @EXPORT_OK = qw( timegm_nocheck timelocal_nocheck ); | ||
15 | |||||
16 | 1 | 3µs | my @MonthDays = ( 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ); | ||
17 | |||||
18 | # Determine breakpoint for rolling century | ||||
19 | 1 | 34µs | my $ThisYear = ( localtime() )[5]; | ||
20 | 1 | 1µs | my $Breakpoint = ( $ThisYear + 50 ) % 100; | ||
21 | 1 | 600ns | my $NextCentury = $ThisYear - $ThisYear % 100; | ||
22 | 1 | 400ns | $NextCentury += 100 if $Breakpoint < 50; | ||
23 | 1 | 100ns | my $Century = $NextCentury - 100; | ||
24 | 1 | 100ns | my $SecOff = 0; | ||
25 | |||||
26 | 1 | 300ns | my ( %Options, %Cheat ); | ||
27 | |||||
28 | 3 | 26µs | 2 | 111µs | # spent 60µs (9+51) within Time::Local::BEGIN@28 which was called
# once (9µs+51µs) by LWP::UserAgent::BEGIN@12 at line 28 # spent 60µs making 1 call to Time::Local::BEGIN@28
# spent 51µs making 1 call to constant::import |
29 | 3 | 22µs | 2 | 54µs | # spent 30µs (5+24) within Time::Local::BEGIN@29 which was called
# once (5µs+24µs) by LWP::UserAgent::BEGIN@12 at line 29 # spent 30µs making 1 call to Time::Local::BEGIN@29
# spent 24µs making 1 call to constant::import |
30 | 3 | 1.78ms | 2 | 53µs | # spent 30µs (6+23) within Time::Local::BEGIN@30 which was called
# once (6µs+23µs) by LWP::UserAgent::BEGIN@12 at line 30 # spent 30µs making 1 call to Time::Local::BEGIN@30
# spent 23µs making 1 call to constant::import |
31 | |||||
32 | 1 | 100ns | my $MaxInt; | ||
33 | 1 | 3µs | if ( $^O eq 'MacOS' ) { | ||
34 | # time_t is unsigned... | ||||
35 | $MaxInt = ( 1 << ( 8 * $Config{ivsize} ) ) - 1; | ||||
36 | } | ||||
37 | else { | ||||
38 | 1 | 12µs | 1 | 41µs | $MaxInt = ( ( 1 << ( 8 * $Config{ivsize} - 2 ) ) - 1 ) * 2 + 1; # spent 41µs making 1 call to Config::FETCH |
39 | } | ||||
40 | |||||
41 | 1 | 600ns | my $MaxDay = int( ( $MaxInt - ( SECS_PER_DAY / 2 ) ) / SECS_PER_DAY ) - 1; | ||
42 | |||||
43 | # Determine the EPOC day for this machine | ||||
44 | 1 | 100ns | my $Epoc = 0; | ||
45 | 1 | 2µs | if ( $^O eq 'vos' ) { | ||
46 | # work around posix-977 -- VOS doesn't handle dates in the range | ||||
47 | # 1970-1980. | ||||
48 | $Epoc = _daygm( 0, 0, 0, 1, 0, 70, 4, 0 ); | ||||
49 | } | ||||
50 | elsif ( $^O eq 'MacOS' ) { | ||||
51 | $MaxDay *=2 if $^O eq 'MacOS'; # time_t unsigned ... quick hack? | ||||
52 | # MacOS time() is seconds since 1 Jan 1904, localtime | ||||
53 | # so we need to calculate an offset to apply later | ||||
54 | $Epoc = 693901; | ||||
55 | $SecOff = timelocal( localtime(0)) - timelocal( gmtime(0) ) ; | ||||
56 | $Epoc += _daygm( gmtime(0) ); | ||||
57 | } | ||||
58 | else { | ||||
59 | 1 | 18.9ms | 1 | 29µs | $Epoc = _daygm( gmtime(0) ); # spent 29µs making 1 call to Time::Local::_daygm |
60 | } | ||||
61 | |||||
62 | 1 | 2µs | %Cheat = (); # clear the cache as epoc has changed | ||
63 | |||||
64 | # spent 29µs (24+5) within Time::Local::_daygm which was called
# once (24µs+5µs) by LWP::UserAgent::BEGIN@12 at line 59 | ||||
65 | |||||
66 | # This is written in such a byzantine way in order to avoid | ||||
67 | # lexical variables and sub calls, for speed | ||||
68 | return $_[3] + ( | ||||
69 | 4 | 28µs | 1 | 5µs | $Cheat{ pack( 'ss', @_[ 4, 5 ] ) } ||= do { # spent 5µs making 1 call to Time::Local::CORE:pack |
70 | my $month = ( $_[4] + 10 ) % 12; | ||||
71 | my $year = ( $_[5] + 1900 ) - ( $month / 10 ); | ||||
72 | |||||
73 | ( ( 365 * $year ) | ||||
74 | + ( $year / 4 ) | ||||
75 | - ( $year / 100 ) | ||||
76 | + ( $year / 400 ) | ||||
77 | + ( ( ( $month * 306 ) + 5 ) / 10 ) | ||||
78 | ) | ||||
79 | - $Epoc; | ||||
80 | } | ||||
81 | ); | ||||
82 | } | ||||
83 | |||||
84 | sub _timegm { | ||||
85 | my $sec = | ||||
86 | $SecOff + $_[0] + ( SECS_PER_MINUTE * $_[1] ) + ( SECS_PER_HOUR * $_[2] ); | ||||
87 | |||||
88 | return $sec + ( SECS_PER_DAY * &_daygm ); | ||||
89 | } | ||||
90 | |||||
91 | sub timegm { | ||||
92 | my ( $sec, $min, $hour, $mday, $month, $year ) = @_; | ||||
93 | |||||
94 | if ( $year >= 1000 ) { | ||||
95 | $year -= 1900; | ||||
96 | } | ||||
97 | elsif ( $year < 100 and $year >= 0 ) { | ||||
98 | $year += ( $year > $Breakpoint ) ? $Century : $NextCentury; | ||||
99 | } | ||||
100 | |||||
101 | unless ( $Options{no_range_check} ) { | ||||
102 | croak "Month '$month' out of range 0..11" | ||||
103 | if $month > 11 | ||||
104 | or $month < 0; | ||||
105 | |||||
106 | my $md = $MonthDays[$month]; | ||||
107 | ++$md | ||||
108 | if $month == 1 && _is_leap_year( $year + 1900 ); | ||||
109 | |||||
110 | croak "Day '$mday' out of range 1..$md" if $mday > $md or $mday < 1; | ||||
111 | croak "Hour '$hour' out of range 0..23" if $hour > 23 or $hour < 0; | ||||
112 | croak "Minute '$min' out of range 0..59" if $min > 59 or $min < 0; | ||||
113 | croak "Second '$sec' out of range 0..59" if $sec > 59 or $sec < 0; | ||||
114 | } | ||||
115 | |||||
116 | my $days = _daygm( undef, undef, undef, $mday, $month, $year ); | ||||
117 | |||||
118 | unless ($Options{no_range_check} or abs($days) < $MaxDay) { | ||||
119 | my $msg = ''; | ||||
120 | $msg .= "Day too big - $days > $MaxDay\n" if $days > $MaxDay; | ||||
121 | |||||
122 | $year += 1900; | ||||
123 | $msg .= "Cannot handle date ($sec, $min, $hour, $mday, $month, $year)"; | ||||
124 | |||||
125 | croak $msg; | ||||
126 | } | ||||
127 | |||||
128 | return $sec | ||||
129 | + $SecOff | ||||
130 | + ( SECS_PER_MINUTE * $min ) | ||||
131 | + ( SECS_PER_HOUR * $hour ) | ||||
132 | + ( SECS_PER_DAY * $days ); | ||||
133 | } | ||||
134 | |||||
135 | sub _is_leap_year { | ||||
136 | return 0 if $_[0] % 4; | ||||
137 | return 1 if $_[0] % 100; | ||||
138 | return 0 if $_[0] % 400; | ||||
139 | |||||
140 | return 1; | ||||
141 | } | ||||
142 | |||||
143 | sub timegm_nocheck { | ||||
144 | local $Options{no_range_check} = 1; | ||||
145 | return &timegm; | ||||
146 | } | ||||
147 | |||||
148 | sub timelocal { | ||||
149 | my $ref_t = &timegm; | ||||
150 | my $loc_for_ref_t = _timegm( localtime($ref_t) ); | ||||
151 | |||||
152 | my $zone_off = $loc_for_ref_t - $ref_t | ||||
153 | or return $loc_for_ref_t; | ||||
154 | |||||
155 | # Adjust for timezone | ||||
156 | my $loc_t = $ref_t - $zone_off; | ||||
157 | |||||
158 | # Are we close to a DST change or are we done | ||||
159 | my $dst_off = $ref_t - _timegm( localtime($loc_t) ); | ||||
160 | |||||
161 | # If this evaluates to true, it means that the value in $loc_t is | ||||
162 | # the _second_ hour after a DST change where the local time moves | ||||
163 | # backward. | ||||
164 | if ( ! $dst_off && | ||||
165 | ( ( $ref_t - SECS_PER_HOUR ) - _timegm( localtime( $loc_t - SECS_PER_HOUR ) ) < 0 ) | ||||
166 | ) { | ||||
167 | return $loc_t - SECS_PER_HOUR; | ||||
168 | } | ||||
169 | |||||
170 | # Adjust for DST change | ||||
171 | $loc_t += $dst_off; | ||||
172 | |||||
173 | return $loc_t if $dst_off > 0; | ||||
174 | |||||
175 | # If the original date was a non-extent gap in a forward DST jump, | ||||
176 | # we should now have the wrong answer - undo the DST adjustment | ||||
177 | my ( $s, $m, $h ) = localtime($loc_t); | ||||
178 | $loc_t -= $dst_off if $s != $_[0] || $m != $_[1] || $h != $_[2]; | ||||
179 | |||||
180 | return $loc_t; | ||||
181 | } | ||||
182 | |||||
183 | sub timelocal_nocheck { | ||||
184 | local $Options{no_range_check} = 1; | ||||
185 | return &timelocal; | ||||
186 | } | ||||
187 | |||||
188 | 1 | 56µs | 1; | ||
189 | |||||
190 | __END__ | ||||
191 | |||||
192 | =head1 NAME | ||||
193 | |||||
194 | Time::Local - efficiently compute time from local and GMT time | ||||
195 | |||||
196 | =head1 SYNOPSIS | ||||
197 | |||||
198 | $time = timelocal($sec,$min,$hour,$mday,$mon,$year); | ||||
199 | $time = timegm($sec,$min,$hour,$mday,$mon,$year); | ||||
200 | |||||
201 | =head1 DESCRIPTION | ||||
202 | |||||
203 | This module provides functions that are the inverse of built-in perl | ||||
204 | functions C<localtime()> and C<gmtime()>. They accept a date as a | ||||
205 | six-element array, and return the corresponding C<time(2)> value in | ||||
206 | seconds since the system epoch (Midnight, January 1, 1970 GMT on Unix, | ||||
207 | for example). This value can be positive or negative, though POSIX | ||||
208 | only requires support for positive values, so dates before the | ||||
209 | system's epoch may not work on all operating systems. | ||||
210 | |||||
211 | It is worth drawing particular attention to the expected ranges for | ||||
212 | the values provided. The value for the day of the month is the actual | ||||
213 | day (ie 1..31), while the month is the number of months since January | ||||
214 | (0..11). This is consistent with the values returned from | ||||
215 | C<localtime()> and C<gmtime()>. | ||||
216 | |||||
217 | =head1 FUNCTIONS | ||||
218 | |||||
219 | =head2 C<timelocal()> and C<timegm()> | ||||
220 | |||||
221 | This module exports two functions by default, C<timelocal()> and | ||||
222 | C<timegm()>. | ||||
223 | |||||
224 | The C<timelocal()> and C<timegm()> functions perform range checking on | ||||
225 | the input $sec, $min, $hour, $mday, and $mon values by default. | ||||
226 | |||||
227 | =head2 C<timelocal_nocheck()> and C<timegm_nocheck()> | ||||
228 | |||||
229 | If you are working with data you know to be valid, you can speed your | ||||
230 | code up by using the "nocheck" variants, C<timelocal_nocheck()> and | ||||
231 | C<timegm_nocheck()>. These variants must be explicitly imported. | ||||
232 | |||||
233 | use Time::Local 'timelocal_nocheck'; | ||||
234 | |||||
235 | # The 365th day of 1999 | ||||
236 | print scalar localtime timelocal_nocheck 0,0,0,365,0,99; | ||||
237 | |||||
238 | If you supply data which is not valid (month 27, second 1,000) the | ||||
239 | results will be unpredictable (so don't do that). | ||||
240 | |||||
241 | =head2 Year Value Interpretation | ||||
242 | |||||
243 | Strictly speaking, the year should be specified in a form consistent | ||||
244 | with C<localtime()>, i.e. the offset from 1900. In order to make the | ||||
245 | interpretation of the year easier for humans, however, who are more | ||||
246 | accustomed to seeing years as two-digit or four-digit values, the | ||||
247 | following conventions are followed: | ||||
248 | |||||
249 | =over 4 | ||||
250 | |||||
251 | =item * | ||||
252 | |||||
253 | Years greater than 999 are interpreted as being the actual year, | ||||
254 | rather than the offset from 1900. Thus, 1964 would indicate the year | ||||
255 | Martin Luther King won the Nobel prize, not the year 3864. | ||||
256 | |||||
257 | =item * | ||||
258 | |||||
259 | Years in the range 100..999 are interpreted as offset from 1900, so | ||||
260 | that 112 indicates 2012. This rule also applies to years less than | ||||
261 | zero (but see note below regarding date range). | ||||
262 | |||||
263 | =item * | ||||
264 | |||||
265 | Years in the range 0..99 are interpreted as shorthand for years in the | ||||
266 | rolling "current century," defined as 50 years on either side of the | ||||
267 | current year. Thus, today, in 1999, 0 would refer to 2000, and 45 to | ||||
268 | 2045, but 55 would refer to 1955. Twenty years from now, 55 would | ||||
269 | instead refer to 2055. This is messy, but matches the way people | ||||
270 | currently think about two digit dates. Whenever possible, use an | ||||
271 | absolute four digit year instead. | ||||
272 | |||||
273 | =back | ||||
274 | |||||
275 | The scheme above allows interpretation of a wide range of dates, | ||||
276 | particularly if 4-digit years are used. | ||||
277 | |||||
278 | =head2 Limits of time_t | ||||
279 | |||||
280 | The range of dates that can be actually be handled depends on the size | ||||
281 | of C<time_t> (usually a signed integer) on the given | ||||
282 | platform. Currently, this is 32 bits for most systems, yielding an | ||||
283 | approximate range from Dec 1901 to Jan 2038. | ||||
284 | |||||
285 | Both C<timelocal()> and C<timegm()> croak if given dates outside the | ||||
286 | supported range. | ||||
287 | |||||
288 | =head2 Ambiguous Local Times (DST) | ||||
289 | |||||
290 | Because of DST changes, there are many time zones where the same local | ||||
291 | time occurs for two different GMT times on the same day. For example, | ||||
292 | in the "Europe/Paris" time zone, the local time of 2001-10-28 02:30:00 | ||||
293 | can represent either 2001-10-28 00:30:00 GMT, B<or> 2001-10-28 | ||||
294 | 01:30:00 GMT. | ||||
295 | |||||
296 | When given an ambiguous local time, the timelocal() function should | ||||
297 | always return the epoch for the I<earlier> of the two possible GMT | ||||
298 | times. | ||||
299 | |||||
300 | =head2 Non-Existent Local Times (DST) | ||||
301 | |||||
302 | When a DST change causes a locale clock to skip one hour forward, | ||||
303 | there will be an hour's worth of local times that don't exist. Again, | ||||
304 | for the "Europe/Paris" time zone, the local clock jumped from | ||||
305 | 2001-03-25 01:59:59 to 2001-03-25 03:00:00. | ||||
306 | |||||
307 | If the C<timelocal()> function is given a non-existent local time, it | ||||
308 | will simply return an epoch value for the time one hour later. | ||||
309 | |||||
310 | =head2 Negative Epoch Values | ||||
311 | |||||
312 | Negative epoch (C<time_t>) values are not officially supported by the | ||||
313 | POSIX standards, so this module's tests do not test them. On some | ||||
314 | systems, they are known not to work. These include MacOS (pre-OSX) and | ||||
315 | Win32. | ||||
316 | |||||
317 | On systems which do support negative epoch values, this module should | ||||
318 | be able to cope with dates before the start of the epoch, down the | ||||
319 | minimum value of time_t for the system. | ||||
320 | |||||
321 | =head1 IMPLEMENTATION | ||||
322 | |||||
323 | These routines are quite efficient and yet are always guaranteed to | ||||
324 | agree with C<localtime()> and C<gmtime()>. We manage this by caching | ||||
325 | the start times of any months we've seen before. If we know the start | ||||
326 | time of the month, we can always calculate any time within the month. | ||||
327 | The start times are calculated using a mathematical formula. Unlike | ||||
328 | other algorithms that do multiple calls to C<gmtime()>. | ||||
329 | |||||
330 | The C<timelocal()> function is implemented using the same cache. We | ||||
331 | just assume that we're translating a GMT time, and then fudge it when | ||||
332 | we're done for the timezone and daylight savings arguments. Note that | ||||
333 | the timezone is evaluated for each date because countries occasionally | ||||
334 | change their official timezones. Assuming that C<localtime()> corrects | ||||
335 | for these changes, this routine will also be correct. | ||||
336 | |||||
337 | =head1 BUGS | ||||
338 | |||||
339 | The whole scheme for interpreting two-digit years can be considered a | ||||
340 | bug. | ||||
341 | |||||
342 | =head1 SUPPORT | ||||
343 | |||||
344 | Support for this module is provided via the datetime@perl.org email | ||||
345 | list. See http://lists.perl.org/ for more details. | ||||
346 | |||||
347 | Please submit bugs to the CPAN RT system at | ||||
348 | http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Time-Local or via email | ||||
349 | at bug-time-local@rt.cpan.org. | ||||
350 | |||||
351 | =head1 COPYRIGHT | ||||
352 | |||||
353 | Copyright (c) 1997-2003 Graham Barr, 2003-2007 David Rolsky. All | ||||
354 | rights reserved. This program is free software; you can redistribute | ||||
355 | it and/or modify it under the same terms as Perl itself. | ||||
356 | |||||
357 | The full text of the license can be found in the LICENSE file included | ||||
358 | with this module. | ||||
359 | |||||
360 | =head1 AUTHOR | ||||
361 | |||||
362 | This module is based on a Perl 4 library, timelocal.pl, that was | ||||
363 | included with Perl 4.036, and was most likely written by Tom | ||||
364 | Christiansen. | ||||
365 | |||||
366 | The current version was written by Graham Barr. | ||||
367 | |||||
368 | It is now being maintained separately from the Perl core by Dave | ||||
369 | Rolsky, <autarch@urth.org>. | ||||
370 | |||||
371 | =cut | ||||
# spent 5µs within Time::Local::CORE:pack which was called
# once (5µs+0s) by Time::Local::_daygm at line 69 of Time/Local.pm |