in my trading career from my first day of trading, i have been using Forex Factory economic calendar which is really comfortable to use and knowledgeable also.
the most economic calendar is very supportive to make sure best news trading but sometimes no approach not works.
Economic calendars keep you up to speed on the latest market occurrences, allowing you to be prepared for volatility that may effect your transactions. It is all about obtaining information, which might come from any source.
this one, also dailyfx. MT5 platform also has inbuild calendar same to others I think they use same source (probably Reuters)
I like DailyFX as it allows me to filter and sort events based on their relevance and impact on specific currency pairs.