Proposed formats for parts of the hour with digit code
45-minute interval
level of detail full time first part implied
t Htt H2
15-minute interval
level of detail full time first part implied
q Cqq C2
s/q Cqq:sss C2:3 :sss :3
Cqqsss C5 invalid
q/h hh:q 2:1 :q :1
invalid invalid
m/q/h hh:q:mm 2:1:2 :q:mm :1:2
hhqmm 5 invalid
s/m/q/h hh:q:mm:ss 2:1:2:2 :q:mm:ss :1:2:2
hhqmmss 7 invalid
5-minute interval
level of detail full time first part implied
f fff 3
s/f fff:sss invalid invalid
invalid
3⅓-second part
level of detail full time first part implied
p/h hh:pppp 2:4 :pppp :4
invalid invalid
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