If you are like me you know the day when you started Keto, for me it was October 9th, 2017. 77 days 13 hours, 46 minutes and 12…13…14 seconds ago. 
So how am I so accurate without having to do mental date match or opening a spreadsheet? I use this site and bookmarked with my start date. http://Days.to.
Put in your own Dates and keep track of where you started. When people ask you, you now can answer by looking at your phone and clicking the link!