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clock(n)		     Tcl Built-In Commands		      clock(n)

______________________________________________________________________________

NAME
       clock - Obtain and manipulate time

SYNOPSIS
       clock option ?arg arg ...?
_________________________________________________________________

DESCRIPTION
       This  command  performs	one  of	 several operations that may obtain or
       manipulate strings or values that represent some notion of  time.   The
       option  argument	 determines what action is carried out by the command.
       The legal options (which may be abbreviated) are:		       │

       clock clicks ?-milliseconds?					       │
	      Return a high-resolution time value as a system-dependent	 inte‐ │
	      ger value.  The unit of the value is system-dependent but should │
	      be the highest resolution clock available on the system such  as │
	      a	 CPU  cycle  counter.  If -milliseconds is specified, then the │
	      value is guaranteed to  be  of  millisecond  granularity.	  This │
	      value  should  only  be  used  for  the  relative measurement of │
	      elapsed time.

       clock format clockValue ?-format string? ?-gmt boolean?
	      Converts an integer time value, typically returned by clock sec‐
	      onds, clock scan, or the atime or mtime options of the file com‐
	      mand, to	human-readable	form.	If  the	 -format  argument  is
	      present  the  next  argument  is a string that describes how the
	      date and time are to be formatted.  Field descriptors consist of
	      a % followed by a field descriptor character.  All other charac‐
	      ters are copied into the result.	Valid field descriptors are:

	      %%     Insert a %.

	      %a     Abbreviated weekday name (Mon, Tue, etc.).

	      %A     Full weekday name (Monday, Tuesday, etc.).

	      %b     Abbreviated month name (Jan, Feb, etc.).

	      %B     Full month name.					       │

	      %c							       │
		     Locale specific date and time.  The format for  date  and │
		     time  in  the default "C" locale on Unix/Mac is "%a %b %d │
		     %H:%M:%S %Y".  On Windows, this value is the locale  spe‐ │
		     cific  long  date	and time, as specified in the Regional │
		     Options control panel settings.			       │

	      %C							       │
		     First two digits of the four-digit year (19 or 20).

	      %d     Day of month (01 - 31).				       │

	      %D							       │
		     Date as %m/%d/%y.					       │

	      %e							       │
		     Day of month (1 - 31), no leading zeros.		       │

	      %g							       │
		     The ISO8601 year number corresponding to the ISO8601 week │
		     (%V),  expressed as a two-digit year-of-the-century, with │
		     leading zero if necessary.				       │

	      %G							       │
		     The ISO8601 year number corresponding to the ISO8601 week │
		     (%V), expressed as a four-digit number.		       │

	      %h							       │
		     Abbreviated month name.

	      %H     Hour in 24-hour format (00 - 23).			       │

	      %I							       │
		     Hour in 12-hour format (01 - 12).

	      %j     Day of year (001 - 366).				       │

	      %k							       │
		     Hour in 24-hour format, without leading zeros (0 - 23).   │

	      %l							       │
		     Hour in 12-hour format, without leading zeros (1 - 12).

	      %m     Month number (01 - 12).

	      %M     Minute (00 - 59).					       │

	      %n							       │
		     Insert a newline.

	      %p     AM/PM indicator.					       │

	      %r							       │
		     Time in a locale-specific "meridian" format.  The "merid‐ │
		     ian" format in the default "C" locale is "%I:%M:%S %p".   │

	      %R							       │
		     Time as %H:%M.					       │

	      %s							       │
		     Count of seconds since the epoch, expressed as a  decimal │
		     integer.

	      %S     Seconds (00 - 59).					       │

	      %t							       │
		     Insert a tab.					       │

	      %T							       │
		     Time as %H:%M:%S.					       │

	      %u							       │
		     Weekday number (Monday = 1, Sunday = 7).

	      %U     Week  of  year  (00 - 52), Sunday is the first day of the
		     week.						       │

	      %V							       │
		     Week of year according to ISO-8601 rules.	Week  1	 of  a │
		     given year is the week containing 4 January.	       │

	      %w							       │
		     Weekday number (Sunday = 0, Saturday = 6).

	      %W     Week  of  year  (00 - 52), Monday is the first day of the
		     week.						       │

	      %x							       │
		     Locale specific date format.  The format for  a  date  in │
		     the  default  "C"	locale for Unix/Mac is "%m/%d/%y".  On │
		     Windows, this value is the	 locale	 specific  short  date │
		     format,  as  specified  in	 the  Regional Options control │
		     panel settings.					       │

	      %X							       │
		     Locale specific 24-hour time format.  The	format	for  a │
		     24-hour  time  in	the default "C" locale for Unix/Mac is │
		     "%H:%M:%S".  On Windows, this value is  the  locale  spe‐ │
		     cific  time  format, as specified in the Regional Options │
		     control panel settings.

	      %y     Year without century (00 - 99).

	      %Y     Year with century (e.g. 1990)

	      %Z     Time zone name.

	      If the -format argument is not specified, the format string  "%a │
	      %b  %d %H:%M:%S %Z %Y" is used.  If the -gmt argument is present
	      the next argument must be a boolean which if true specifies that
	      the time will be formatted as Greenwich Mean Time. If false then
	      the local timezone will be used  as  defined  by	the  operating
	      environment.

       clock scan dateString ?-base clockVal? ?-gmt boolean?
	      Convert  dateString  to  an  integer clock value (see clock sec‐
	      onds).  This command can parse and convert virtually  any	 stan‐
	      dard  date  and/or  time string, which can include standard time
	      zone mnemonics.  If only a time is specified, the	 current  date
	      is  assumed.   If	 the  string  does  not	 contain  a  time zone
	      mnemonic, the local time zone is assumed, unless the -gmt	 argu‐
	      ment is true, in which case the clock value is calculated assum‐
	      ing that the specified time is relative to Greenwich Mean	 Time.
	      -gmt,  if	 specified,  affects  only the computed time value; it
	      does not impact the interpretation of -base.

	      If the -base flag is specified, the next argument should contain
	      an  integer  clock  value.  Only the date in this value is used,
	      not the time.  This is useful for determining the time on a spe‐
	      cific day or doing other date-relative conversions.

	      The  dateString  consists	 of zero or more specifications of the
	      following form:

	      time   A time  of	 day,  which  is  of  the  form:  hh?:mm?:ss??
		     ?meridian?	 ?zone?	 or  hhmm  ?meridian?	?zone?.	 If no
		     meridian is specified, hh is  interpreted	on  a  24-hour
		     clock.

	      date   A specific month and day with optional year.  The accept‐
		     able formats are mm/dd?/yy?, monthname dd ?, yy?, dd mon‐
		     thname ?yy?, day, dd monthname yy, ?CC?yymmdd, ?CC?yy-mm-
		     dd, dd-monthname-?CC?yy.  The default year is the current
		     year.   If	 the year is less than 100, we treat the years │
		     00-68 as 2000-2068 and the years 69-99 as 1969-1999.  Not │
		     all  platforms can represent the years 38-70, so an error │
		     may result if these years are used.

	      ISO 8601 point-in-time
		     An ISO 8601 point-in-time specification, such as CCyymmd‐
		     dThhmmss,	where  T is the literal T, CCyymmdd hhmmss, or
		     CCyymmddThh:mm:ss.	 Note that only	 these	three  formats
		     are accepted.  The command does not accept the full range
		     of point-in-time  specifications  specified  in  ISO8601.
		     Other formats can be recognized by using commands such as
		     regexp to extract their fields and reorganize them into a
		     form accepted by the clock scan command.

	      relative time
		     A specification relative to the current time.  The format
		     is number unit  acceptable	 units	are  year,  fortnight,
		     month,  week,  day, hour, minute (or min), and second (or
		     sec).  The unit can be specified as a singular or plural,
		     as	 in  3	weeks.	These modifiers may also be specified:
		     tomorrow, yesterday, today, now, last, this, next, ago.

	      The actual date is calculated according to the following	steps.
	      First, any absolute date and/or time is processed and converted.
	      Using that time as  the  base,  day-of-week  specifications  are
	      added.   Next,  relative	specifications are used.  If a date or
	      day is specified, and no absolute or  relative  time  is	given,
	      midnight	is used.  Finally, a correction is applied so that the
	      correct hour of the day is produced after allowing for  daylight
	      savings  time  differences  and  the  correct date is given when
	      going from the end of a long month to a short month.

	      Daylight savings time correction is applied only when the	 rela‐
	      tive  time  is  specified	 in  units  of days or more, ie, days,
	      weeks, fortnights, months or years.  This means that when cross‐
	      ing  the	daylight savings time boundary, different results will
	      be given for clock scan "1 day" and clock scan "24 hours":
		     % clock scan "1 day" -base [clock scan 1999-10-31]
		     941443200
		     % clock scan "24 hours" -base [clock scan 1999-10-31]
		     941439600

       clock seconds
	      Return the current date and time as a  system-dependent  integer
	      value.  The unit of the value is seconds, allowing it to be used
	      for relative time calculations.  The value is usually defined as
	      total  elapsed time from an ``epoch''.  You shouldn't assume the
	      value of the epoch.

SEE ALSO
       date(1), time(n)

KEYWORDS
       clock, date, time

Tcl				      8.4			      clock(n)
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