184 lines
6.2 KiB
Plaintext
184 lines
6.2 KiB
Plaintext
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'\"
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'\" Copyright (c) 1992-1995 Karl Lehenbauer and Mark Diekhans.
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'\" Copyright (c) 1995-1996 Sun Microsystems, Inc.
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'\"
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'\" This documentation is derived from the time and date facilities of
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'\" TclX, by Mark Diekhans and Karl Lehenbauer.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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'\" SCCS: @(#) clock.n 1.13 96/05/03 14:40:37
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'\"
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.so man.macros
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.TH clock n 7.4 Tcl "Tcl Built-In Commands"
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.BS
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'\" Note: do not modify the .SH NAME line immediately below!
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.SH NAME
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clock \- Obtain and manipulate time
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.SH SYNOPSIS
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\fBclock \fIoption\fR ?\fIarg arg ...\fR?
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.BE
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.SH DESCRIPTION
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.PP
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This command performs one of several operations that may obtain
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or manipulate strings or values that represent some notion of
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time. The \fIoption\fR argument determines what action is carried
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out by the command. The legal \fIoptions\fR (which may be
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abbreviated) are:
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.TP
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\fBclock clicks\fR
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Return a high-resolution time value as a system-dependent integer
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value. The unit of the value is system-dependent but should be the
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highest resolution clock available on the system such as a CPU cycle
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counter. This value should only be used for the relative measurement
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of elapsed time.
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.TP
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\fBclock format \fIclockValue\fR ?\fB\-format \fIstring\fR? ?\fB\-gmt \fIboolean\fR?
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Converts an integer time value, typically returned by
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\fBclock seconds\fR, \fBclock scan\fR, or the \fBatime\fR, \fBmtime\fR,
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or \fBctime\fR options of the \fBfile\fR command, to human-readable
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form. If the \fB\-format\fR argument is present the next argument is a
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string that describes how the date and time are to be formatted.
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Field descriptors consist of a \fB%\fR followed by a field
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descriptor character. All other characters are copied into the result.
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Valid field descriptors are:
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.RS
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.IP \fB%%\fR
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Insert a %.
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.IP \fB%a\fR
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Abbreviated weekday name (Mon, Tue, etc.).
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.IP \fB%A\fR
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Full weekday name (Monday, Tuesday, etc.).
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.IP \fB%b\fR
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Abbreviated month name (Jan, Feb, etc.).
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.IP \fB%B\fR
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Full month name.
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.IP \fB%c\fR
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Locale specific date and time.
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.IP \fB%d\fR
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Day of month (01 - 31).
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.IP \fB%H\fR
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Hour in 24-hour format (00 - 23).
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.IP \fB%I\fR
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Hour in 12-hour format (00 - 12).
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.IP \fB%j\fR
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Day of year (001 - 366).
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.IP \fB%m\fR
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Month number (01 - 12).
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.IP \fB%M\fR
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Minute (00 - 59).
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.IP \fB%p\fR
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AM/PM indicator.
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.IP \fB%S\fR
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Seconds (00 - 59).
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.IP \fB%U\fR
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Week of year (01 - 52), Sunday is the first day of the week.
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.IP \fB%w\fR
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Weekday number (Sunday = 0).
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.IP \fB%W\fR
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Week of year (01 - 52), Monday is the first day of the week.
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.IP \fB%x\fR
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Locale specific date format.
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.IP \fB%X\fR
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Locale specific time format.
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.IP \fB%y\fR
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Year without century (00 - 99).
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.IP \fB%Y\fR
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Year with century (e.g. 1990)
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.IP \fB%Z\fR
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Time zone name.
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.RE
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.sp
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.RS
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In addition, the following field descriptors may be supported on some
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systems (e.g. Unix but not Windows):
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.IP \fB%D\fR
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Date as %m/%d/%y.
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.IP \fB%e\fR
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Day of month (1 - 31), no leading zeros.
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.IP \fB%h\fR
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Abbreviated month name.
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.IP \fB%n\fR
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Insert a newline.
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.IP \fB%r\fR
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Time as %I:%M:%S %p.
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.IP \fB%R\fR
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Time as %H:%M.
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.IP \fB%t\fR
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Insert a tab.
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.IP \fB%T\fR
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Time as %H:%M:%S.
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.RE
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.sp
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.RS
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If the \fB\-format\fR argument is not specified, the format string
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"\fB%a %b %d %H:%M:%S %Z %Y\fR" is used. If the \fB\-gmt\fR argument
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is present the next argument must be a boolean which if true specifies
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that the time will be formatted as Greenwich Mean Time. If false
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then the local timezone will be used as defined by the operating
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environment.
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.RE
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.TP
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\fBclock scan \fIdateString\fR ?\fB\-base \fIclockVal\fR? ?\fB\-gmt \fIboolean\fR?
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Convert \fIdateString\fR to an integer clock value (see \fBclock seconds\fR).
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This command can parse and convert virtually any standard date and/or time
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string, which can include standard time zone mnemonics. If only a time is
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specified, the current date is assumed. If the string does not contain a
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time zone mnemonic, the local time zone is assumed, unless the \fB\-gmt\fR
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argument is true, in which case the clock value is calculated assuming
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that the specified time is relative to Greenwich Mean Time.
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.sp
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If the \fB\-base\fR flag is specified, the next argument should contain
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an integer clock value. Only the date in this value is used, not the
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time. This is useful for determining the time on a specific day or
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doing other date-relative conversions.
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.sp
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The \fIdateString\fR consists of zero or more specifications of the
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following form:
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.RS
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.TP
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\fItime\fR
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A time of day, which is of the form: \fIhh\fR?\fI:mm\fR?\fI:ss\fR??
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?\fImeridian\fR? ?\fIzone\fR? or \fIhhmm \fR?\fImeridian\fR?
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?\fIzone\fR?. If no meridian is specified, \fIhh\fR is interpreted on
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a 24-hour clock.
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.TP
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\fIdate\fR
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A specific month and day with optional year. The
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acceptable formats are \fImm/dd\fR?\fI/yy\fR?, \fImonthname dd\fR
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?, \fIyy\fR?, \fIdd monthname \fR?\fIyy\fR? and \fIday, dd monthname
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yy\fR. The default year is the current year. If the year is less
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then 100, then 1900 is added to it.
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.TP
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\fIrelative time\fR
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A specification relative to the current time. The format is \fInumber
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unit\fR acceptable units are \fByear\fR, \fBfortnight\fR, \fBmonth\fR, \fBweek\fR, \fBday\fR,
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\fBhour\fR, \fBminute\fR (or \fBmin\fR), and \fBsecond\fR (or \fBsec\fR). The
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unit can be specified as a singular or plural, as in \fB3 weeks\fR.
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These modifiers may also be specified:
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\fBtomorrow\fR, \fByesterday\fR, \fBtoday\fR, \fBnow\fR,
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\fBlast\fR, \fBthis\fR, \fBnext\fR, \fBago\fR.
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.RE
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.sp
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.RS
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The actual date is calculated according to the following steps.
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First, any absolute date and/or time is processed and converted.
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Using that time as the base, day-of-week specifications are added.
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Next, relative specifications are used. If a date or day is
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specified, and no absolute or relative time is given, midnight is
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used. Finally, a correction is applied so that the correct hour of
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the day is produced after allowing for daylight savings time
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differences.
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.RE
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.TP
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\fBclock seconds\fR
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Return the current date and time as a system-dependent integer value. The
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unit of the value is seconds, allowing it to be used for relative time
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calculations. The value is usually defined as total elapsed time from
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an ``epoch''. You shouldn't assume the value of the epoch.
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.SH KEYWORDS
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clock, date, time
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