Converting to and from epoch time

Solution 1:

date -d @526276800 "+%m/%d/%y"

Solution 2:

On my Mac OS X box, I use:

date -r 526276800 +%m/%d/%y

Solution 3:

With GNU date:

date -d '1970-01-01 946684800 seconds'

Solution 4:

Or in Ruby:

% ruby -e 'puts Time.now.to_f'
1243620267.8988

% ruby -e 'puts Time.now.to_i'
1243620267

% ruby -e 'puts Time.at 1243620270'
Fri May 29 11:04:30 -0700 2009

% ruby -e 'puts Time.at(1243620270).strftime "at %I:%M%p"'
at 11:04AM

Here are the strftime formats, taken from the ruby Time class documentation:

  %a - The abbreviated weekday name (``Sun'')
  %A - The  full  weekday  name (``Sunday'')
  %b - The abbreviated month name (``Jan'')
  %B - The  full  month  name (``January'')
  %c - The preferred local date and time representation
  %d - Day of the month (01..31)
  %H - Hour of the day, 24-hour clock (00..23)
  %I - Hour of the day, 12-hour clock (01..12)
  %j - Day of the year (001..366)
  %m - Month of the year (01..12)
  %M - Minute of the hour (00..59)
  %p - Meridian indicator (``AM''  or  ``PM'')
  %S - Second of the minute (00..60)
  %U - Week  number  of the current year,
          starting with the first Sunday as the first
          day of the first week (00..53)
  %W - Week  number  of the current year,
          starting with the first Monday as the first
          day of the first week (00..53)
  %w - Day of the week (Sunday is 0, 0..6)
  %x - Preferred representation for the date alone, no time
  %X - Preferred representation for the time alone, no date
  %y - Year without a century (00..99)
  %Y - Year with century
  %Z - Time zone name
  %% - Literal ``%'' character

Solution 5:

$ perl -le 'print scalar localtime 1243620900'
Fri May 29 11:15:00 2009