Forex trades 24h Mon–Fri across four major sessions. Liquidity peaks during overlaps - the London / New York overlap (1pm–5pm UTC) is the highest-volume window of the day.
When to use it
Plan around volatility. Range strategies prefer Asian session; breakout strategies prefer London/NY overlap.
Formula
No formula - convert a session's home-zone open/close into your local timezone via standard offset arithmetic.
Worked example
London open at 8am UTC = 4am NY (EST), 11:30am IST, 5pm Sydney.
Why does the London/NY overlap matter?
Both sessions trade simultaneously for ~4 hours, doubling participants and tightening spreads - best window for execution-sensitive strategies.