%f microseconds 000000 to 99999
%S or %s seconds, two-digit 00 to 59
%i minutes, two-digit 00 to 59
%k hours (24-hour clock) 0 to 23
%H hours, two-digit, 0 to 23 o'clock 00 to 23
%l hours (12-hour clock) 1 to 12
%h or %I hours, two-digit, to 12 o'clock 01 to 12
%T 24-hour clock 00:00:00 to 23:59:59
%r 12-hour clock 12:00:00 AM to 11:59:59 PM
%p AM or PM AM, PM