/usr/include/ql/time/ is in libquantlib0-dev 1.12-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ql/time/all.hpp
/usr/include/ql/time/asx.hpp
/usr/include/ql/time/businessdayconvention.hpp
/usr/include/ql/time/calendar.hpp
/usr/include/ql/time/calendars/
/usr/include/ql/time/calendars/all.hpp
/usr/include/ql/time/calendars/argentina.hpp
/usr/include/ql/time/calendars/australia.hpp
/usr/include/ql/time/calendars/bespokecalendar.hpp
/usr/include/ql/time/calendars/botswana.hpp
/usr/include/ql/time/calendars/brazil.hpp
/usr/include/ql/time/calendars/canada.hpp
/usr/include/ql/time/calendars/china.hpp
/usr/include/ql/time/calendars/czechrepublic.hpp
/usr/include/ql/time/calendars/denmark.hpp
/usr/include/ql/time/calendars/finland.hpp
/usr/include/ql/time/calendars/germany.hpp
/usr/include/ql/time/calendars/hongkong.hpp
/usr/include/ql/time/calendars/hungary.hpp
/usr/include/ql/time/calendars/iceland.hpp
/usr/include/ql/time/calendars/india.hpp
/usr/include/ql/time/calendars/indonesia.hpp
/usr/include/ql/time/calendars/israel.hpp
/usr/include/ql/time/calendars/italy.hpp
/usr/include/ql/time/calendars/japan.hpp
/usr/include/ql/time/calendars/jointcalendar.hpp
/usr/include/ql/time/calendars/mexico.hpp
/usr/include/ql/time/calendars/newzealand.hpp
/usr/include/ql/time/calendars/norway.hpp
/usr/include/ql/time/calendars/nullcalendar.hpp
/usr/include/ql/time/calendars/poland.hpp
/usr/include/ql/time/calendars/romania.hpp
/usr/include/ql/time/calendars/russia.hpp
/usr/include/ql/time/calendars/saudiarabia.hpp
/usr/include/ql/time/calendars/singapore.hpp
/usr/include/ql/time/calendars/slovakia.hpp
/usr/include/ql/time/calendars/southafrica.hpp
/usr/include/ql/time/calendars/southkorea.hpp
/usr/include/ql/time/calendars/sweden.hpp
/usr/include/ql/time/calendars/switzerland.hpp
/usr/include/ql/time/calendars/taiwan.hpp
/usr/include/ql/time/calendars/target.hpp
/usr/include/ql/time/calendars/turkey.hpp
/usr/include/ql/time/calendars/ukraine.hpp
/usr/include/ql/time/calendars/unitedkingdom.hpp
/usr/include/ql/time/calendars/unitedstates.hpp
/usr/include/ql/time/calendars/weekendsonly.hpp
/usr/include/ql/time/date.hpp
/usr/include/ql/time/dategenerationrule.hpp
/usr/include/ql/time/daycounter.hpp
/usr/include/ql/time/daycounters/
/usr/include/ql/time/daycounters/actual360.hpp
/usr/include/ql/time/daycounters/actual365fixed.hpp
/usr/include/ql/time/daycounters/actual365nl.hpp
/usr/include/ql/time/daycounters/actualactual.hpp
/usr/include/ql/time/daycounters/all.hpp
/usr/include/ql/time/daycounters/business252.hpp
/usr/include/ql/time/daycounters/one.hpp
/usr/include/ql/time/daycounters/simpledaycounter.hpp
/usr/include/ql/time/daycounters/thirty360.hpp
/usr/include/ql/time/ecb.hpp
/usr/include/ql/time/frequency.hpp
/usr/include/ql/time/imm.hpp
/usr/include/ql/time/period.hpp
/usr/include/ql/time/schedule.hpp
/usr/include/ql/time/timeunit.hpp
/usr/include/ql/time/weekday.hpp