xclock - analog / digital clock for X
xclock [ -help ] [ -analog | -digital ] [
  -brief ] [ -chime ] [ -hd color ] [ -hl
  color ] [ -update seconds ] [ -strftime
  format ] [ -twelve | -twentyfour | -utime ] [
  -padding number ] [ -norender ] [ -render ] [
  -sharp ] [ -face pattern ]
The xclock program displays the time in analog or digital form. The time
  is continuously updated at a frequency which may be specified by the user.
Xclock accepts all of the standard X Toolkit command line options along
  with the additional options listed below:
  - -help
- This option indicates that a brief summary of the allowed options should
      be printed on the standard error.
- -analog
- This option indicates that a conventional 12 hour clock face with tick
      marks and hands should be used. This is the default.
- -digital or -d
- This option indicates that a 24 hour digital clock should be used.
- -brief
- This option indicates that the digital clock should only display the hours
      and minutes fields. The default is to show the full time and date
      information.
- -utime
- This option indicates that a digital clock should display seconds since
      the Epoch (in format '970012340 seconds since Epoch' instead of a standard
      24-hour time.
- -strftime format
- This option allows an strftime(3) format string to be specified for the
      digital clock's display.
- -twelve
- This option indicates that a digital clock should display the time in
      twelve hour format. This is only effective for the brief display.
- -twentyfour
- This option indicates that a digital clock should display the time in
      twenty-four hour format. This is only effective for the brief display.
      This is the default when a digital clock is used.
- -chime
- This option indicates that the clock should chime once on the half hour
      and twice on the hour.
- -hands color (or -hd color)
- This option specifies the color of the hands on an analog clock. The
      default is black. This option is effectively ignored when Xrender
      is in use.
- -highlight color (or -hl color)
- This option specifies the color of the edges of the hands on an analog
      clock, and is only useful on color displays. The default is black.
      This option is effectively ignored when Xrender is in use.
- -update seconds
- This option specifies the frequency in seconds at which xclock
      should update its display. If the clock is obscured and then exposed, it
      will be updated immediately. A value of 30 seconds or less will enable a
      second hand on an analog clock. The default is 60 seconds.
- -padding number
- This option specifies the width in pixels of the padding between the
      window border and clock text or picture. The default is 10 on a digital
      clock and 8 on an analog clock.
- -render
- This option tells xclock to use the Xrender extension to draw an
      anti-aliased face. This is the default if xclock has been compiled
      with Xrender support. Note that the color selection options and resources
      used when Xrender is in effect differ from the standard options.
- -norender
- This option turns off the use of Xrender to draw the clock.
- -sharp
- This option tells xclock to use sharper edges when drawn using the
      Xrender extension.
- -face pattern
- This option specifies the font to use in digital mode when the Xrender
      extension is used. Patterns are specified using the fontconfig face format
      described in the Font Names section of fonts.conf(5).
This program uses the Clock widget. It understands all of the core
  resource names and classes as well as:
  - width (class Width)
- Specifies the width of the clock. The default for analog clocks is 164
      pixels; the default for digital clocks is whatever is needed to hold the
      clock when displayed in the chosen font.
- height (class Height)
- Specifies the height of the clock. The default for analog clocks is 164
      pixels; the default for digital clocks is whatever is needed to hold the
      clock when displayed in the chosen font.
- update (class Interval)
- Specifies the frequency in seconds at which the time should be
      redisplayed.
- foreground (class Foreground)
- Specifies the color for the tick marks. The default depends on whether
      reverseVideo is specified. If reverseVideo is specified the
      default is lwhite, otherwise the default is black.
    
  
- hands (class Foreground)
- Specifies the color of the insides of the clock's hands. The default
      depends on whether reverseVideo is specified. If
      reverseVideo is specified the default is lwhite, otherwise
      the default is black. Note that this resource is not used when
      Xrender is in effect.
- highlight (class Foreground)
- Specifies the color used to highlight the clock's hands. The default is
     depends on whether reverseVideo is specified. If reverseVideo
      is specified the default is lwhite, otherwise the default is
      black. Note that this resource is not used when Xrender is in
      effect.
- analog (class Boolean)
- Specifies whether or not an analog clock should be used instead of a
      digital one. The default is True.
- twentyfour (class Boolean)
- Specifies whether or not a digital clock should display the time in
      twenty-four hour format. The default is True.
- chime (class Boolean)
- Specifies whether or not a bell should be rung on the hour and half
    hour.
- padding (class Margin)
- Specifies the amount of internal padding in pixels to be used. The default
      is 8.
- font (class Font)
- Specifies the font to be used for the digital clock. Note that variable
      width fonts currently will not always display correctly. This font is only
      used when Xrender is not in effect.
- render (class Boolean)
- Specifies whether or not the Xrender extension should be used for the
      display. The default is True if xclock has been compiled with
      Xrender support.
When Xrender is in effect, the following additional resources are
    understood:
  - face (class FaceName)
- Specify the pattern for the font to be used for the digital clock when
      Xrender is used. Patterns are specified using the fontconfig face format
      described in the Font Names section of fonts.conf(5).
- sharp (class Boolean)
- Specifies if sharp edges should be used when rendering the clock. The
      default is False.
- buffer (class Boolean)
- Specifies that the updates of the image are drawn to a pixmap before
      copied into the window instead drawing them into the window directly.
The defaults of the following color resources depend on whether
    reverseVideo is specified. If reverseVideo is specified the
    default is lwhite, otherwise the default is black.
  - hourColor (class Foreground)
- The color of the hour hand.
- minuteColor (class Foreground)
- The color of the minute hand.
- secondColor (class Foreground)
- The color of the second hand.
- majorColor (class Foreground)
- The color of the major scale ticks (i. e. each five minutes).
- minorColor (class Foreground)
- The color of the minor scale ticks (between major ticks).
In order to specify resources, it is useful to know the hierarchy of the widgets
  which compose xclock. In the notation below, indentation indicates
  hierarchical structure. The widget class name is given first, followed by the
  widget instance name.
XClock  xclock
        Clock  clock
  - DISPLAY
- to get the default host and display number.
- XENVIRONMENT
- to get the name of a resource file that overrides the global resources
      stored in the RESOURCE_MANAGER property.
  - /usr/X11R7/lib/X11/app-defaults/XClock
- specifies required resources
X(7), xrdb(1), time(3), fonts.conf (5).
Xclock believes the system clock.When in digital mode, the string should be centered
  automatically.
Tony Della Fera (MIT-Athena, DEC)
Dave Mankins (MIT-Athena, BBN)
Ed Moy (UC Berkeley)