As you may know, forex is open 24 hours, from 17h (EST) Sunday to 17H (EST) Friday. That’s 7 hours for Sunday from 17h to 00h, 4 x 24h Monday through Thursday and 17 hours for Friday, from 00h to 17h, for a total of 120 trading hours or the equivalent of 5 days.
However, the various market centers open and close at various hours as you can see below.
This table is in EST.
Frankfurt is open from 2am to 10am.
London from 3am to 11am.
New-York from 8am to 4pm.
Sydney from 6pm to 2am.
Tokyo 7am to 3am.
In pink, I put the periods where 3 markets overlap:
From 2am to 3am: Frankfurt, Sydney, Tokyo
From 3am to 3am: Frankfurt, London, Tokyo
From 8am to 10am: Frankfurt, London, North America
In blue, you’ve got the periods when 2 markets overlap. And in green, only one market is active.
If you want to make yourself a table like this in your own time zone, simply convert your time from EST or go to this time zone converter:
http://forex.timezoneconverter.com/
