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=>     R0 =     15
     R1 =     pointer to parameter block
     R1+0 = reason code :
       5 :     Write CMOS clock and soft-copy time from 5-byte integer (4.00+)
       8 :     Write CMOS clock and soft-copy time from string
       15 :     Write CMOS clock and soft-copy date from string
       24 :     Write CMOS clock and soft-copy time and date from string

Nowhere does the PRM say how to determine the correct format of string to pass for the current territory. Presumably it is to be done by inspection from a time read with OS_Word 14.