Je was op zoek naar: hh (Engels - Wels)

hh
aa

(=[hh]: mm)
(=[ aa]:: mm)

(=[hh]: mm: ss)
(=[ aa]:: mm:: ee)

end at this time [hh: mm: ss]
gorffen hyd yr amser yma [aa: mm: ee]

start from this time [hh: mm: ss]
dechrau o' r amser yma [aa: mm: ee]

default duration of new appointment (hh: mm)
hyd rhagosodedig cyfarfod newydd:

repeat until time [[[yyyy-]mm-]dd-]hh: mm [tz], or date yyyy-mm-dd [tz]
ailadrodd tan amser [[[bbbb -] mm -] dd] aa: mm, neu ddyddiad bbbb- mm- dd