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gawk: Getlocaltime Function

 
 10.2.7 Managing the Time of Day
 -------------------------------
 
 Functions:: provide the minimum functionality necessary for dealing with
 the time of day in human-readable form.  Although 'strftime()' is
 extensive, the control formats are not necessarily easy to remember or
 intuitively obvious when reading a program.
 
    The following function, 'getlocaltime()', populates a user-supplied
 array with preformatted time information.  It returns a string with the
 current time formatted in the same way as the 'date' utility:
 
      # getlocaltime.awk --- get the time of day in a usable format
 
      # Returns a string in the format of output of date(1)
      # Populates the array argument time with individual values:
      #    time["second"]       -- seconds (0 - 59)
      #    time["minute"]       -- minutes (0 - 59)
      #    time["hour"]         -- hours (0 - 23)
      #    time["althour"]      -- hours (0 - 12)
      #    time["monthday"]     -- day of month (1 - 31)
      #    time["month"]        -- month of year (1 - 12)
      #    time["monthname"]    -- name of the month
      #    time["shortmonth"]   -- short name of the month
      #    time["year"]         -- year modulo 100 (0 - 99)
      #    time["fullyear"]     -- full year
      #    time["weekday"]      -- day of week (Sunday = 0)
      #    time["altweekday"]   -- day of week (Monday = 0)
      #    time["dayname"]      -- name of weekday
      #    time["shortdayname"] -- short name of weekday
      #    time["yearday"]      -- day of year (0 - 365)
      #    time["timezone"]     -- abbreviation of timezone name
      #    time["ampm"]         -- AM or PM designation
      #    time["weeknum"]      -- week number, Sunday first day
      #    time["altweeknum"]   -- week number, Monday first day
 
      function getlocaltime(time,    ret, now, i)
      {
          # get time once, avoids unnecessary system calls
          now = systime()
 
          # return date(1)-style output
          ret = strftime("%a %b %e %H:%M:%S %Z %Y", now)
 
          # clear out target array
          delete time
 
          # fill in values, force numeric values to be
          # numeric by adding 0
          time["second"]       = strftime("%S", now) + 0
          time["minute"]       = strftime("%M", now) + 0
          time["hour"]         = strftime("%H", now) + 0
          time["althour"]      = strftime("%I", now) + 0
          time["monthday"]     = strftime("%d", now) + 0
          time["month"]        = strftime("%m", now) + 0
          time["monthname"]    = strftime("%B", now)
          time["shortmonth"]   = strftime("%b", now)
          time["year"]         = strftime("%y", now) + 0
          time["fullyear"]     = strftime("%Y", now) + 0
          time["weekday"]      = strftime("%w", now) + 0
          time["altweekday"]   = strftime("%u", now) + 0
          time["dayname"]      = strftime("%A", now)
          time["shortdayname"] = strftime("%a", now)
          time["yearday"]      = strftime("%j", now) + 0
          time["timezone"]     = strftime("%Z", now)
          time["ampm"]         = strftime("%p", now)
          time["weeknum"]      = strftime("%U", now) + 0
          time["altweeknum"]   = strftime("%W", now) + 0
 
          return ret
      }
 
    The string indices are easier to use and read than the various
 formats required by 'strftime()'.  The 'alarm' program presented in
 ⇒Alarm Program uses this function.  A more general design for the
 'getlocaltime()' function would have allowed the user to supply an
 optional timestamp value to use instead of the current time.
 
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