The time zone. The default value is the local GMT±hh:mm time zone, where hh:mm is the offset in hours and minutes from UTC at the start of the time interval. A time zone defines the beginning of a day. For instance, Sunday 23:30 GMT (London) is the same time as Monday 00:30 GMT+01 (Berlin). Events from that time may be included in statistics for Sunday or Monday, depending on the time zone specified (Europe/London or Europe/Berlin). See http://en.wikipedia.org/wiki/Tz_database for information about IANA time zones.

public string TimeZone { set; }