10/9c time is a term used in the entertainment industry, particularly in Hollywood. It refers to the time of day (or night) when most people are watching television.
For example, you might hear someone say that a show airs at 10/9c meaning it will air at 10 p.m., Eastern Standard Time (EST), and 9 p.m., Central Standard Time (CST). The abbreviations EST and CST are used because they’re more familiar to non-Hollywood people than the standard designations for each time zone: Eastern Daylight Savings Time (EDT) and Central Daylight Savings Time (CDT).
Why Do We Use 10/9c?
The main reason we use these two numbers instead of our standard system is so that we can use them internationally without confusion. If we used EST or CDT, then there would be no way to tell which time zone was being referenced unless everyone was familiar with that particular time zone’s offset from Greenwich Mean Time (GMT). For example, if I were writing in Australia and wanted to say my show aired at 7:30 PM EST, how would anyone know what I meant?
Last modified: August 17, 2022