Fix Python – Python list sort in descending order

How can I sort this list in descending order?
timestamps = [
“2010-04-20 10:07:30”,
“2010-04-20 10:07:38”,
“2010-04-20 10:07:52”,
“2010-04-20 10:08:22”,
“2010-04-20 10:08:22”,
“2010-04-20 10:09:46”,
“2010-04-20 10:10:37”,
“2010-04-20 10:10:58”,
“2010-04-20 10:11:50”,
“2010-04-20 10:12:13”,
“2010-04-20 10….