I can help with that. To answer when it gets dark today, it depends on your location. “Darkness” typically starts with sunset (when the sun goes below the horizon) followed by civil twilight, nautical twilight, and astronomical twilight. If you’re asking for when it’s fully dark (astronomical twilight end to night), that varies by latitude and date. If you share your city or location (and whether you mean the onset of civil twilight or full darkness), I can give you exact times for today. If you’re in the Netherlands, for example, sunset today is around 4:37–4:39 PM local time, with civil darkness beginning shortly after sunset and full darkness following during astronomical twilight a bit later in the evening.