There are certain daily trade.
The three are:
London time. (start both daily and 4 hourly at midnight)
New York time. (start both daily and 4 hourly at midnight)
Tokyo time (maybe not as great as the 1st 2 ).
Euro and Swissy time zone doesn't work since there are various time zones inside that zone, and banks across the zone open at irregular hours, depending on which nation.
Some of the euro zone banks actually open at the exact same time as the London banks, raising the importance of the London time.
Be sure you take into account day light savings of London and New York for the daily and 4 hour candles. At change over dates of october and march / november.