to_unixtime
perl -e 'use Date::Parse;\$t=\"@ARGV\";printf(\"\$t\t%d\n\",str2time(\$t))'from_unixtime
perl -e 'for(@ARGV){@t=localtime(\$_);printf(\"\$_\t%d/%02d/%02d %02d:%02d:%02d\n\",@t[5]+1900,@t[4]+1,@t[3],@t[2],@t[1],@t[0])}'to_unixtime
perl -e 'use Date::Parse;\$t=\"@ARGV\";printf(\"\$t\t%d\n\",str2time(\$t))'from_unixtime
perl -e 'for(@ARGV){@t=localtime(\$_);printf(\"\$_\t%d/%02d/%02d %02d:%02d:%02d\n\",@t[5]+1900,@t[4]+1,@t[3],@t[2],@t[1],@t[0])}'
http://stackoverflow.com/questions/2237596/how-do-i-convert-local-time-to-unix-time-stamp-in-perl