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
Central Daylight Time (CDT) is the Central Time Zone of the United States of America (USA). Central Standard Time (CST) is 6 hours behind Greenwich Mean Time (GMT-6).
In most states in the USA and in most provinces in Canada, Daylight-Saving Time (DST) is observed. During DST CT (or CDT) is 5 hours behind Greenwich Mean Time (GMT-5).
After the Summer months Central Time is shifted back by 1 hour to US Central Standard Time (CST) or (GMT-6).