From Online Manual
description: The quote tag formats text as a quote. If you use the quote button, then it will be formatted for you. This is a block level tag.
The author property specifies an author of the quote. If the name contains complex characters please use quotes.[quote author="SMF Doc Team"]blocks, text or more BB Code[/quote]
You can also specify a link to the quote and a time. All three are required, you cannot have only a time for example. The link property can only specify internal forum links. The date property is in the format of a unix timestamp.
[quote author="SMF Doc Team" link=topic=570 date=1141105279]blocks, text or more BB Code[/quote]
In the above example it would link to the topic with the id of 570, by the user SMF Doc Team and have a timestamp of 1141105279 which would convert to February 28, 2006, 12:41:19 am (depending on the user's default time settings).
example: [quote]blocks, text or more BB Code[/quote]