The arrow project is an attempt to wrap Python’s time and datetime modules into a single API. It also claims to plug gaps in functionality in those modules, such as time spans, ISO-8601 and humanization. You can kind of think of arrow as a drop-in replacement for Python’s datetime and time modules, much like the requests project can be used instead of Python’s urllib. Arrow supports Python 2.6, 2.7 and 3.3 at the time of this writing.