=> R0 = territory number, or -1 for current
R1 = pointer to input block
R2 = pointer to output block
R3 = format specifier and flags
b0-7 = input format
b8-15 = output format
b16 = convert as though DST was in use
b17 = if DST calculation fails use standard time instead of returning an error
b18 = calculate b16 automatically
b19 = treat R4 as the signed centisecond timezone offset
b20-31 = reserved, set to 0
R4 = timezone within territory (b19 clear) else centiseconds (b19 set)
This SWI converts one time representation into another, accounting for local time if requested.
Input ordinals need only be the 7 word format, but output will always be 9 word format.
The territory, timezone, and DST flags are only needed for UTC to local/local to UTC conversions.
Formats known
0 local ordinals
1 local 5 byte time
2 UTC ordinals
3 UTC 5 byte time
4+ reserved for future use
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