Creating reminder for 120 days

Dear Friends,,,

Myself Arun Kumar From India need a help for creating a reminder for 120 days and need popup can u help me out. I am having a tour operating firm and need to book train tickets the booking starts 120 days prior to journey So i dont want to miss the date

do you use MS outlook? It's much easier to create reminders via outlook, and you can customise for it to pop up every day, hour, etc.

plenty of websites that you can set up a reminder to email you on a certain date