7 day JR pass count

Hello,

I'm planning my Japan trip next year in March and was confused on the 7 day count for the pass.

I will activate the pass on March 11th to go from Tokyo to Kyoto. Will my pass expire on March 16th at 23:59pm? or March 17th at 23:59pm? Trying to figure out if i can get an extra day in Osaka or not.

March 11th Tokyo -> Kyoto
March 12th Kyoto
March 13th Kyoto
March 14th Kyoto -> Osaka
March 15th Osaka
March 16th or March 17th Osaka -> Tokyo

Thank you,