These can lead to a lot of confusion when the times don’t match up. A common mistake in all manner of announcements and broadcasts, is not defining between these two forms of time zones. During the summer months, EDT is observed and in the winter EST is returns to the dominant form of time. This concept refers to “springing ahead” in the early spring and “falling back” in the fall. When it comes to the distinction between EDT and EST, the matter becomes more complicated as Daylight Saving Time isn’t something that all members of each time zone observe. If all of this sounds confusing, you can easily use a time zone converter to make the changes quickly when scheduling between time zones. This is of course assuming that you’re both in standard or daylight time respectively. If the meeting is 12:45 in your eastern time, then it would be 3 hours behind for them, so 9:45. If you wanted to have a Skype chat with someone on the west coast, you would need to calculate for a three hour difference in time that moves backward. If you’re on the west coast, you are on Pacific Standard Time (PST) or PDT (daylight time) again, depending on if it’s summer or winter. For example, if you’re on the eastern coast of the United States, you’re in the EST/EDT zone depending on what time of year it is. When providing a time or scheduling a meeting, it’s important that you understand how these time zone distinctions work. The time zone at the end allows the viewers to understand that it begins at that time in a specific time zone so they can plan accordingly if they live on the west coast for example. A great example is saying that an event beginning in Miami begins at 1:30 PM EST. In many cases you will see the abbreviation of the time zone placed after the scheduled time. It’s common courtesy to provide a time zone when scheduling a broadcast or a live event. As mentioned earlier, not every country in this time zone uses the practice. The reason for these biannual changes in the time was originally to allow for more sunlight during the summer months for those who worked the standard 9 to 5 shifts at their jobs. During the winter months when they go back an hour, they will be 5 hours behind UTC and therefore part of Eastern Standard Time. In the summer, those who observe this practice will be on EDT time which is four 4 hours behind Universal Coordinated Time. When considering the difference between EDT and EST, we need to understand how Daylight Saving Time functions. The note states "This method is based on the systems in use in the Armed Forces of these countries and the United States".EDT vs EST: Finding the Differences and Fixing Common Mistakes The standard was first distributed by NATO as a note in 1950. Sandford Fleming devised a system assigning the letters A-Y excluding J to 1-hour time zones, which may have been the inspiration for the system. The letter "Z" ("Zulu") indicates Coordinated Universal Time (UTC). The letter "J" ("Juliet"), originally skipped, may be used to indicate the observer's local time. in zone UTC−5 is written "0600R" and spoken "zero six hundred Romeo". The letters are typically used in conjunction with military time. Going west from Greenwich, letters "November" to "Yankee" represent zones with negative offsets. Going east from the prime meridian at Greenwich, letters "Alfa" to "Mike" (skipping "J", see below) represent the 12 time zones with positive UTC offsets until reaching the international Date Line. The names are identical to the NATO phonetic alphabet. Military time zones are defined in the ACP 121(I) standard, which is used by the armed forces for Australia, Canada, New Zealand, the United Kingdom, the United States, and many other nations.
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