When did the Fukushima accident take place?

The earthquake that caused the accidents was on Friday, March 11, 2011, at 14:46 JST. The first tsunamis from the earthquake hit the Fukushima Daiichi plant about 40 minutes later, and were followed by the tsunami that overwhelmed the plant about 20 minutes after that.

The earthquake and tsunamis were just the start of a series of accidents that unfolded in time. There is a link below to a timeline for these events.