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.\" Japanese Version Copyright (c) 2002 NAKANO Takeo all rights reserved.
.\" Translated Thu 3 Jan 2002 by NAKANO Takeo <nakano@apm.seikei.ac.jp>
.\"
.TH TIMEGM 3 " 2016\-12\-12" GNU "Linux Programmer's Manual"
.SH 名前
timegm, timelocal \- gmtime と localtime の逆関数
.SH 書式
.nf
\fB#include <time.h>\fP
.PP
\fBtime_t timelocal(struct tm *\fP\fItm\fP\fB);\fP
.PP
\fBtime_t timegm(struct tm *\fP\fItm\fP\fB);\fP
.PP
.fi
.RS -4
glibc 向けの機能検査マクロの要件 (\fBfeature_test_macros\fP(7)  参照):
.RE
.PP
\fBtimelocal\fP(),
\fBtimegm\fP():
    Since glibc 2.19:
        _DEFAULT_SOURCE
    Glibc 2.19 and earlier:
        _BSD_SOURCE || _SVID_SOURCE
.SH 説明
The functions \fBtimelocal\fP()  and \fBtimegm\fP()  are the inverses of
\fBlocaltime\fP(3)  and \fBgmtime\fP(3).  Both functions take a broken\-down time
and convert it to calendar time (seconds since the Epoch, 1970\-01\-01
00:00:00 +0000, UTC).  The difference between the two functions is that
\fBtimelocal\fP()  takes the local timezone into account when doing the
conversion, while \fBtimegm\fP()  takes the input value to be Coordinated
Universal Time (UTC).
.SH 返り値
On success, these functions return the calendar time (seconds since the
Epoch), expressed as a value of type \fItime_t\fP.  On error, they return the
value \fI(time_t)\ \-1\fP and set \fIerrno\fP to indicate the cause of the error.
.SH エラー
.TP 
\fBEOVERFLOW\fP
The result cannot be represented.
.SH 属性
この節で使用されている用語の説明については、 \fBattributes\fP(7) を参照。
.TS
allbox;
lbw21 lb lb
l l l.
インターフェース	属性	値
T{
 \fBtimelocal\fP(),
\fBtimegm\fP()
T}	Thread safety	MT\-Safe env locale
.TE
.SH 準拠
これらの関数は非標準で GNU の拡張である。 BSD 系にも存在する。 これらの使用は避けること。
.SH 注意
\fBtimelocal\fP()  関数は POSIX の標準関数 \fBmktime\fP(3)  と同じものである。 ので、これを使う理由はないはずである。
.SH 関連項目
\fBgmtime\fP(3), \fBlocaltime\fP(3), \fBmktime\fP(3), \fBtzset\fP(3)
.SH この文書について
この man ページは Linux \fIman\-pages\fP プロジェクトのリリース 5.10 の一部である。プロジェクトの説明とバグ報告に関する情報は
\%https://www.kernel.org/doc/man\-pages/ に書かれている。