SpaceX and NASA decided to delay the launch of the unmanned Crewed Dragon test flight by ten days. The new date of the demonstration mission is January 17th. A second, crewed test flight is scheduled for sometime in April 2019, and if everything goes well the first regular flight may occur in September 2019.
NASA frames this as an “adjustment” rather than a delay. Although, delays are nothing new in spaceflight. It’s a high-stakes mission even if there won’t be any passengers aboard. Even a small error could result in a significant setback as NASA and SpaceX scramble to identify and fix the issue. A minor fuel leak on Boeing’s CST-100 Starliner crew capsule several months ago contributed to a multi-month delay in its testing schedule.