Eastern is 1h ahead of CDT when on EDT; EST and CDT can share the same offset in fall.

The time difference between Central Daylight Time (CDT) and Eastern Standard Time (EST) is 1 hour. EST is 1 hour ahead of CDT. Note that CDT is used during Daylight Saving Time (spring/summer), while EST is used during standard time (fall/winter).

CDT (Central Daylight Time, UTC-5:00) is used in the central United States during Daylight Saving Time, typically from March to November. EST (Eastern Standard Time, UTC-5:00) is used in the eastern United States during standard time, typically from November to March. When both regions observe DST, the difference becomes EDT (UTC-4:00) vs CDT (UTC-5:00), maintaining the 1-hour difference.

Here are some common time conversions:

9:00 AM CDT = 10:00 AM EST
12:00 PM (noon) CDT = 1:00 PM EST
3:00 PM CDT = 4:00 PM EST
6:00 PM CDT = 7:00 PM EST
9:00 PM CDT = 10:00 PM EST
12:00 AM (midnight) CDT = 1:00 AM EST

CDT is used in central US states like Texas, Illinois, Missouri, Wisconsin, and others during Daylight Saving Time. EST is used in eastern US states like New York, Florida, Georgia, and most of the East Coast during standard time. The 1-hour difference makes it easy to coordinate activities between these regions.