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EST is the same as Central Daylight Saving Time (CDT); both are UTC-5. That means that during the summer, places like Chicago and Houston (CDT) are on the same time as places like Jamaica and Panama (EST).When to use CST or CDT?
When planning a call between CST and CDT, you need to consider time difference between these time zones. CST is 1 hour behind of CDT. If you are in CST, the most convenient time to accommodate all parties is between 9:00 am and 5:00 pm for a conference call or meeting. In CDT, this will be a usual working time of between 10:00 am and 6:00 pm.