When I learned that for the Jews the new day begins the evening before, I was irritated at first. Then I took note of it. Today I find it remarkable, because during the night we process some of the things of the previous day. When I wake up in the morning, I often have an impression of whether I had a good, quiet night or whether I had to process a lot. And just as I get up in the morning, so I go into the - for us - new day. Therefore, the night actually prepares me for the coming day and therefore I find it quite wise and appropriate to define that the new day begins the evening before. So we start the new day with our night's rest. This also fits with the creation story: on the 7th day God rested from all his work. And on the 6th day man was created. This means that the first new day for man was a day of rest, the week begins with rest, the new day with night. So relaxing to know.
I wish you an extraordinary day!