A recent study shows that the first half of May is the best time to list a home for sale in order to both maximize sales price and to minimize time on market. The study also shows that putting your home on the market at the end of the week or on the weekend is recommended in order to stimulate the most activity.
Here is full article from Zillow:
https://www.zillow.com/research/best-time-to-list-2018-19215/