There is a new method for doing a timed attack.   It is much similar to the old method for timed attack except rather than each person having to list their time to target, the initiator gives a start time and each person calculates the difference and starts automatically.

Advantages:    This provides a much smoother process with very little channel communication.   Also it allows for multiple targets.   Also it prevents issues due to similar start times.

Disadvantage:  It requires each person to be proficient at calculating their own time.

The Process:

1. There is one person who leads the attack and calls the targets.
2. That person gives one or more targets and whether they are fake or real.
3. Fake targets you simply send 1 soldier in a TA.
4. Real targets you send a full army in the TA.
5. When the leader calls the targets he gives the target, position, and the time of the Upper right most gift timer when to start. 
6. Each person then subtracts their travel time plus 5 seconds to prepare.
7. That time is the time that they start counting a 5 second countdown, and then send troops.

Example: Target is at 100:100 for example The countdown timer for the target says 3d 01:48:52.  The leader calls "Target 100:100 at 01:45:00" This means in 3 minutes all troops arrive at the target. Now you measure time and your travel time is 1:40. You calculate 01:45:00 + 00:01:40 = 01:46:40. Add another 5 seconds for you to get ready. So at countdown of 01:46:45 you start your 5 second count and prepare to send troops. You count down 5, 4, 3, 2, 1 as  you go into send troops. When you get to 0, you release your troops. Each person does the same.   Thus all arriving at the target at the same time.

Here are some Videos That may Help:

Advanced Timed Attack Strategy

Multi-Target Advanced Attack

Here are some useful Mobile Apps for Calculating Time Differences:

Apple: Time Calculator

Android: Time Calculator