USA and Canada Standard Time Date schedules here
The Central Timezone is an area 6 hours behind Greenwich Mean Time (GMT-6) during the winter months (referred to as CST) and 5 hours behind Greenwich Mean Time (GMT-5) during the summer months (referred to as CDT). At the moment, the following schedule is used:
From 2 A.M. on the second Sunday in March to 2 A.M. on the first Sunday in November, Daylight Saving Time is in effect. At all other times, Standard Time is in effect.
NB The Canadian province of Saskatchewan does not adopt Daylight Saving Time and remains on CST or GMT-6 all year.
In most states in the USA and in most provinces in Canada, Daylight-Saving Time (DST) is observed. During DST the time is shifted forward by 1 hour to Central Daylight Time (CDT); which 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).