"description": "String, containing time offset, intended for representing difference between two timestamps. Format is time part of [[http://tools.ietf.org/html/rfc3339|RFC 3339]], optionally prepended by \"D\" or \"d\" separator and number of days (which can have arbitrary number number of digits). \"D\" separator has been chosen to distinguish from internet time, and as a memory aid for \"duration\" or \"days\". For example \"536D10:20:30.5\" means 536 days, 10 hours, 20 seconds, 30.5 seconds, whereas 00:05:00 represents five minutes.\n\n[[http://tools.ietf.org/html/rfc2234|ABNF]] syntax:\n{{{\ntime-hour = 2DIGIT ; 00-23\ntime-minute = 2DIGIT ; 00-59\ntime-second = 2DIGIT ; 00-59\ntime-secfrac = \".\" 1*DIGIT\nseparator = \"D\" / \"d\"\ndays = 1*DIGIT\n\nduration = [days separator] time-hour \":\" time-minute \":\" time-second [time-secfrac]\n}}}",
