Oh, it sounds like Ivm asking those questions rhetorically. I'm not. They are very subtle and difficult questions. Ponder them and think about them. Part of the problem is that we really abuse what $\sqrt {a} $ means. What does it mean? how many values does it have? Is it unambiguous in meaning?
Exact time now, time zone, time difference, sunrise/sunset time and key facts for Eastern Standard Time (EST).
Eastern Standard Time (EST) is 5 hours behind Coordinated Universal Time (UTC). This time zone is in use during standard time in: North America, Caribbean, Central America.
EST is the most followed timezone in the United States, covering roughly 47% of the US population. Major cities in the EST/EDT zone include New York City, Washington D.C., Miami, Toronto, and Boston.
The Eastern Time Zone is also known as Eastern Standard Time (EST) falls mostly along the east coast of North America. Its time offset is −5 hours (UTC/GMT -5) during standard time and −4 hours (UTC/GMT -4) during daylight saving time.
What time is it EST? Check exact current time and discover the key facts about Eastern Standard Time
Discover everything about the EST time zone, including its current time, UTC offset, and the countries that observe EST.
Eastern Standard Time to Worldwide Time Converters, Current Local Time in EST, EST Clock with Seconds
The daylight saving time that matches EST is "Eastern Daylight Time" (EDT). Canada, the United States and also some Caribbean islands set their clocks forward by one hour to this daylight saving time in the summer and back again in the fall.