The "/timeline" page:

Query parameters:

   a=TIMEORTAG    After this event
   b=TIMEORTAG    Before this event
   c=TIMEORTAG    "Circa" this event
   m=TIMEORTAG    Mark this event
   n=COUNT        Suggested number of events in output
   p=CHECKIN      Parents and ancestors of CHECKIN
   d=CHECKIN      Descendants of CHECIN
   dp=CHECKIN     The same as d=CHECKIN&p=CHECKIN
   t=TAG          Show only check-ins with the given TAG
   r=TAG          Show check-ins related to TAG, equivalent to t=TAG&rel
   rel            Show related check-ins as well as those matching t=TAG
   mionly         Limit rel to show ancestors but not descendants
   ms=STYLE       Set tag match style to EXACT, GLOB, LIKE, REGEXP
   u=USER         Only show items associated with USER
   y=TYPE         'ci', 'w', 't', 'e', or (default) 'all'
   ng             No Graph.
   nd             Do not highlight the focus check-in
   v              Show details of files changed
   f=CHECKIN      Show family (immediate parents and children) of CHECKIN
   from=CHECKIN   Path from...
   to=CHECKIN       ... to this
   shortest         ... show only the shortest path
   uf=FILE_HASH   Show only check-ins that contain the given file version
   chng=GLOBLIST  Show only check-ins that involve changes to a file whose
                    name matches one of the comma-separate GLOBLIST
   brbg           Background color from branch name
   ubg            Background color from user
   namechng       Show only check-ins that have filename changes
   forks          Show only forks and their children
   ym=YYYY-MM     Show only events for the given year/month
   yw=YYYY-WW     Show only events for the given week of the given year
   ymd=YYYY-MM-DD Show only events on the given day
   datefmt=N      Override the date format
   bisect         Show the check-ins that are in the current bisect
   showid         Show RIDs
   showsql        Show the SQL text

p= and d= can appear individually or together.  If either p= or d=
appear, then u=, y=, a=, and b= are ignored.

If both a= and b= appear then both upper and lower bounds are honored.