Indeed. There are Americans who will tell me PST, when they meant PDT but forgot to mention that. Now I have to track the American DST calendar as well as European DST calendar to do the conversion.
There are also people who tell me GMT (because they think that term means "the time in London") when they meant BST (because in summer, London doesn't operate on GMT).
There are also people who tell me GMT (because they think that term means "the time in London") when they meant BST (because in summer, London doesn't operate on GMT).