Studying Time Zones: UTC , EST and EDT

Working and dealing with various clients located in different areas around the world is not an easy task. You have to be aware of the time difference between you and your client's time zones which is very crucial and important when meeting up their deadlines. There are some terms and points to consider in learning these things. But before we can start off, I would like to remind the reader that I only make time comparison here between my own time zone where I am located which is UTC+08 (Philippine Time Zone) and other places which is  most likely located in US, Canada, UK and Asia Pacific regions.

What are the common acronyms used in Time Zones?
UTC = Coordinated Universal Time
GMT = Greenwich Mean Time
EST = Eastern Standard Time
EDT = Eastern Daylight Time

Important Notes:
GMT is an absolute time reference & doesn't change with the seasons. EST is 5 hours behind of Coordinated Universal Time (UTC). Note that most places in US and Canada observe daylight saving time during summer, and are therefore using EDT instead in the summer.

This would be a nose bleed stuff if you will just use your fingers in counting the differences of other time zones to that of your country. Now to make things easier for us, we can use an online tool that allows us to convert time differences.

Here is the link:
http://www.timeanddate.com/worldclock/converter.html

Here are some of the sample time zone conversions that I made: