1 .\" Copyright (c) 1993 Michael Haardt
3 .\" Fri Apr 2 11:32:09 MET DST 1993
5 .\" %%%LICENSE_START(GPLv2+_DOC_FULL)
6 .\" This is free documentation; you can redistribute it and/or
7 .\" modify it under the terms of the GNU General Public License as
8 .\" published by the Free Software Foundation; either version 2 of
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11 .\" The GNU General Public License's references to "object code"
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16 .\" This manual is distributed in the hope that it will be useful,
17 .\" but WITHOUT ANY WARRANTY; without even the implied warranty of
18 .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 .\" GNU General Public License for more details.
21 .\" You should have received a copy of the GNU General Public
22 .\" License along with this manual; if not, see
23 .\" <http://www.gnu.org/licenses/>.
26 .\" Modified Sat Jul 24 14:23:14 1993 by Rik Faith (faith@cs.unc.edu)
27 .\" Modified Sun Oct 18 17:31:43 1998 by Andries Brouwer (aeb@cwi.nl)
28 .\" 2008-06-23, mtk, minor rewrites, added some details
30 .TH FTIME 3 2017-09-15 "GNU" "Linux Programmer's Manual"
32 ftime \- return date and time
34 .B "#include <sys/timeb.h>"
36 .BI "int ftime(struct timeb *" tp );
38 This function returns the current time as seconds and milliseconds
39 since the Epoch, 1970-01-01 00:00:00 +0000 (UTC).
40 The time is returned in
42 which is declared as follows:
48 unsigned short millitm;
55 Here \fItime\fP is the number of seconds since the Epoch,
56 and \fImillitm\fP is the number of milliseconds since \fItime\fP
57 seconds since the Epoch.
58 The \fItimezone\fP field is the local timezone measured in minutes
59 of time west of Greenwich (with a negative value indicating minutes
61 The \fIdstflag\fP field
62 is a flag that, if nonzero, indicates that Daylight Saving time
63 applies locally during the appropriate part of the year.
65 POSIX.1-2001 says that the contents of the \fItimezone\fP and \fIdstflag\fP
66 fields are unspecified; avoid relying on them.
68 This function always returns 0.
69 (POSIX.1-2001 specifies, and some systems document, a \-1 error return.)
71 For an explanation of the terms used in this section, see
77 Interface Attribute Value
80 T} Thread safety MT-Safe
84 POSIX.1-2008 removes the specification of
87 This function is obsolete.
89 If the time in seconds
96 gives nanoseconds but is not as widely available.
99 Early glibc2 is buggy and returns 0 in the
102 glibc 2.1.1 is correct again.
106 .\" function appeared in 4.2BSD.
108 .BR gettimeofday (2),