This program called Equinoxes and Solstices (whose full name is Equinoxes and Solstices and Cross-Quarter Days) is a tool to accurately calculate the dates and times of the equinoxes, the solstices and the Cross-Quarter days (those days that usually mediate approximately between a solstice and an equinox).
For example, at an observatory in the northern hemisphere they fall just halfway between the Winter solstice and the Spring equinox. Equinoxes and Solstices performs all calculations in a few minutes.
In Equinoxes and Solstices you can search for any year, as well as search in different time zones of the planet.
You can free download Equinoxes and Solstices and safe install the latest trial or new full version for Windows 10 (x32, 64 bit, 86) from the official site.
Devices: Desktop PC, Laptop (ASUS, HP, DELL, Acer, Lenovo, MSI), Ultrabook
OS: Professional, Enterprise, Education, Home Edition, versions: 1507, 1511, 1607, 1703, 1709, 1803, 1809