=> R0 = territory number, or -1 for current
R1 = 0 = read current DST state
1 = write current DST state
2 = supported
3 = apply rule to ordinals
4 = apply rule to time
5 = get bounds for given year
This call returns details on the daylight saving applicable in the given territory.
Read current DST state
<= R0 = state
b0 = DST active when set
b1 = DST managed automatically when set
This is equivalent to the *STATUS command.
Write current DST state
=> R2 = new state
b0 = DST active when set
b1 = DST managed automatically when set
This is equivalent to the *CONFIGURE command.
Supported
<= R0 = 1 if the territory supports this API (error or 0 if not)
Apply rule to ordinals
=> R2 = timezone within territory
R3 = buffer containing UTC time ordinals
<= R0 = state
b0 = DST active when set
Apply rule to time
=> R2 = timezone within territory
R3 = buffer containing UTC time
<= R0 = state
b0 = DST active when set
Get bounds for given year
=> R2 = timezone within territory
R3 = year, or -1 for current
R4 = 5 byte buffer for DST start time
R5 = 5 byte buffer for DST end time
Remember that in the southern hemisphere DST ends earlier in the year than it starts, don't assume the end time is greater than the start in that case.
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