After reading conan for like 20 years, ever since I was more less around the age of conan and now I'm way older than Shinichi by more than 10 years, all I can say is: Don't take everything too seriously in this manga, how the time moves doesn't even add up in here 😂
They changed from flip phones to smartphone. I think Ran once mentioned in like chapter 700ish that it has just been 3 months ever since the 1st chapter. Just enjoy the shenanigans that Ghoso wrote and add continuously to the manga, cause he keeps developing it in time. I think he started making this manga without any specific plot direction in the beginning, so who knows how many time has he changed the ending he intended lol. I just wish the manga will be finished before Gosho pass away.