You can quickly check the current time difference between Europe and the US by viewing the current time zone at the top right of both countries. time zone clocks . clock symbols info
For ex. Paris +1h versus New York -5h, there is a difference of 6 hours, so Paris is always 6 hours ahead New York in standard time.
Paris, Europe and New York, US coincide in standard time from the 1st Sunday of November (End of US Daylight Saving Time) until the 2nd Sunday of March of the following year. (Start of US Daylight Saving Time).
You can also refer to the 4 Time Zone Colors = Intervals that are multiples of 4 hours between the same colors.
For example, between London, England, UK and Los Angeles, California, US (both in pink) the time difference (in standard time or both with DST), will be London, UK 8 hours ahead of Los Angeles.