datetime constraint

MIDI Base64

RO-1: start = past - end = future

RO-1

RO-2: start = future - end = future

RO-2

RO-3: start = past - end = past

RO-3

RO-4: no start - end = future

RO-4

RO-5: start = past - no end

RO-5

RO-6: start = past - end empty

RO-6

RO-7: start empty - end = future

RO-7