INT 21 - LANtastic - GET TIME FROM SERVER
        AX = 5FC0h
        DS:SI -> time block (see below)
        ES:DI -> ASCIZ server name to get time from
Return: CF clear if successful
        CF set on error
            AX = error code

Format of time block:
Offset  Size    Description
 00h    WORD    year
 02h    BYTE    day
 03h    BYTE    month
 04h    BYTE    minutes
 05h    BYTE    hour
 06h    BYTE    hundredths of second
 07h    BYTE    second