1) I referred "latest activities" just for our knowledge… That there is a bug regarding time difference, Infect "latest activities" 's time is correct… !
2) regarding mail — its difficult to explain but say for example — you and me both are member, if you send me a friend request it will notify me on my registered mail Id, the containt of mail shows a sentence " Dear idea, Here's the latest activity on site related to you: 17 hours ago"… This 17 hours ago is a time difference bug, actually the activities were happened just few seconds before. I suggest if there is a date + time (time should be of the country selected in admin area like dilli — asia)