+ "\t\tmarks around any parenthesized expression).\n"
+ "\n"
+ "\t\tFinally, results can be restricted to only messages within a\n"
+ "\t\tparticular time range, (based on the Date: header) with:\n"
+ "\n"
+ "\t\t\t<intial-timestamp>..<final-timestamp>\n"
+ "\n"
+ "\t\tEach timestamp is a number representing the number of seconds\n"
+ "\t\tsince 1970-01-01 00:00:00 UTC. This is not the most convenient\n"
+ "\t\tmeans of expressing date ranges, but until notmuch is fixed to\n"
+ "\t\taccept a more convenient form, one can use the date program to\n"
+ "\t\tconstruct timestamps. For example, with the bash shell the\n"
+ "\t\tfollowing syntax would specify a date range to return messages\n"
+ "\t\tfrom 2009-10-01 until the current time:\n"
+ "\n"
+ "\t\t\t$(date +%%s -d 2009-10-01)..$(date +%%s)\n\n";