I’ve spent almost the last two weeks dealing with Date and Time Zone related issues within one of the applications I contract on. This is a just a list of notable behaviours I expereinced whilst working with Ruby, Rails, Dates & TimeZones. Note: DST is in effect at the time of writing. Inconsistent Handling of DST In the code below we instantiate an ActiveSupport::TimeZone object. I would love to think that this instance would know everything about that Time Zone.