Formats a date in a relative, friendly way. For example, "2 minutes ago". A
DateFormatter
is used to
format some dates according to the server's formats and the user's time zone. As such, you will need a new
instance of this class for each user and "current time", typically one per request.
It is recommended that you pass a "now" time to the constructor to ensure that times are formatted
against a known standard point in time. The alternate constructor uses the time that this object is created,
which is probably not very useful.
This class is not thread-safe, primarily because it uses a DateFormatter class which is not thread-safe.