'\" t
.\"     Title: function::ctime
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: November 2020
.\"    Manual: Time utility functions
.\"    Source: SystemTap Tapset Reference
.\"  Language: English
.\"
.TH "FUNCTION::CTIME" "3stap" "November 2020" "SystemTap Tapset Reference" "Time utility functions"
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.SH "NAME"
function::ctime \- Convert seconds since epoch into human readable date/time string
.SH "SYNOPSIS"
.sp
.nf
1) ctime:string(epochsecs:long)
.fi
.sp
.nf
2) ctime:string()
.fi
.SH "ARGUMENTS"
.PP
\fIepochsecs\fR
.RS 4
Number of seconds since epoch (as returned by
\fBgettimeofday_s\fR)
.RE
.SH "DESCRIPTION"
.PP
1) Takes an argument of seconds since the epoch as returned by\fBgettimeofday_s\fR\&. Returns a string of the form
.PP
2)
\(lqWed Jun 30 21:49:08 1993\(rq
.PP
The string will always be exactly 24 characters\&. If the time would be unreasonable far in the past (before what can be represented with a 32 bit offset in seconds from the epoch) an error will occur (which can be avoided with try/catch)\&. If the time would be unreasonable far in the future, an error will also occur\&.
.PP
Note that the epoch (zero) corresponds to
.PP
\(lqThu Jan 1 00:00:00 1970\(rq
.PP
The earliest full date given by ctime, corresponding to epochsecs \-2147483648 is
\(lqFri Dec 13 20:45:52 1901\(rq\&. The latest full date given by ctime, corresponding to epochsecs 2147483647 is
\(lqTue Jan 19 03:14:07 2038\(rq\&.
.PP
The abbreviations for the days of the week are \(oqSun\(cq, \(oqMon\(cq, \(oqTue\(cq, \(oqWed\(cq, \(oqThu\(cq, \(oqFri\(cq, and \(oqSat\(cq\&. The abbreviations for the months are \(oqJan\(cq, \(oqFeb\(cq, \(oqMar\(cq, \(oqApr\(cq, \(oqMay\(cq, \(oqJun\(cq, \(oqJul\(cq, \(oqAug\(cq, \(oqSep\(cq, \(oqOct\(cq, \(oqNov\(cq, and \(oqDec\(cq\&.
.PP
Note that the real C library
\fBctime\fR
function puts a newline (\*(Aq\en\*(Aq) character at the end of the string that this function does not\&. Also note that since the kernel has no concept of timezones, the returned time is always in GMT\&.
.PP

.SH SEE ALSO\n 
.IR tapset::ctime (3stap)