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


       clock - Obtain and manipulate time

       clock option ?arg arg ...?

       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
	      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. This value should only be used for the rel‐
	      ative 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, mtime, or ctime options of the
	      file command, 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.

	      %d     Day of month (01 - 31).

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

	      %I     Hour in 12-hour format (00 - 12).

	      %j     Day of year (001 - 366).

	      %m     Month number (01 - 12).

	      %M     Minute (00 - 59).

	      %p     AM/PM indicator.

	      %S     Seconds (00 - 59).

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

	      %w     Weekday number (Sunday = 0).

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

	      %x     Locale specific date format.

	      %X     Locale specific time format.

	      %y     Year without century (00 - 99).

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

	      %Z     Time zone name.

	      In addition, the following field descriptors may be supported on
	      some systems (e.g. Unix but not Windows):

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

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

	      %h     Abbreviated month name.

	      %n     Insert a newline.

	      %r     Time as %I:%M:%S %p.

	      %R     Time as %H:%M.

	      %t     Insert a tab.

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

	      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

       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.

	      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

	      date   A specific month and day with optional year.  The accept‐
		     able formats are mm/dd?/yy?, monthname dd ?, yy?, dd mon‐
		     thname ?yy? and day, dd monthname 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.

	      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.

       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.

       clock, date, time

Tcl				      7.4			      clock(n)
                             _         _         _ 
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                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 
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