there is no Forex econmic calandar which works for all time. its all about short time approach , nothing without it.
I use Forex Factory, Myfxbook, and FXStreet. Their economic calendars are good. Personally, I rely more on the Forex Factory because the information is more organised and easier to access.
These are some examples of forex economic calendars; you can choose one based on your preferences Econoday Myfxbook. ForexFactory Trading Economics.
These are some examples of forex economic calendars, you can choose one that suits your needs. Fxstreet Dailyfx Investing Fxstreet is my personal favourite because it is more informative and simple to understand.
BabyPips is also a good option. Their market calendar offers a macroeconomic perspective and it is beneficial to both new and experienced traders.
I see many brokers also update their clients regarding the news and its impact through either sending email or thorough their blog posts.
Though there are many sources for referring to the economic calendar, I consider ForexFactory and FXStreet for updates. I find them more reliable.