Sunday 8 March 2015 2am local time
until Sunday 1 November 2015 2am local time
see: Daylight-Saving-Time.com for details
USA and Canada Standard Time Date schedules here
Like most states in the USA, Daylight-Saving Time (DST) is observed in LA Time, where the time is shifted forward by 1 hour to Pacific Daylight Time (PDT); which is 7 hours behind Greenwich Mean Time (GMT-7).
After the Summer months the time in LA Time is shifted back by 1 hour to US Pacific Standard Time (PST) or (GMT-8)