> Note that timezones aren't just geographical. In London, you'll be in timezone GMT (+0000) for half the year and timezone BST (+0100) for half the year. You'

> Note that timezones aren't just geographical. In London, you'll be in timezone GMT (+0000) for half the year and timezone BST (+0100) for half the year. You're comparing apples and oranges. There are two different concepts here: 1) the name of a UTC offset for a given period of time in a given region i.e. BST. 2) the geographic area that has a set of rules about when to change the UTC offset. In the US, we call #1 "Central Standard Time or Central Daylight Time" and #2 "Central Time". #1 means "UTC -6", and #2 means "convert UTC according to whatever the current rule is". The author's point is to store local time + concept #2. EDIT: ok, I see what you mean. If the user types in "send me a reminder at 12:30 Oct 25 London time, you don't know whether they're talking about pre-DST, or post-DST. Interesting.