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OS_Word 14_1 BCD Format
Programmer's Reference Manuals
» Part 15 – SWI Calls
» OS
» OS_Word
» OS_Word 14
» OS_Word 14,1
» BCD Format
BCD Format
| Offset | Contents |
|---|---|
| +0 | Year (0-99) |
| +1 | Month (1-12) |
| +2 | Day of month (1-31) |
| +3 | Day of week (1-7, where 1 = Sunday) |
| +4 | Hour (0-23) |
| +5 | Minute (0-59) |
| +6 | Second (0-59) |
Notes
OS_Word 14, with a reason code of 1, reads the time directly from the CMOS clock.
The time is returned in a Binary Coded Decimal (BCD) format.
OS_Word 14,1 is not Y2K compliant since it returns only a two-digit value for year. As such, this call is deprecated.
The year shall be returned as a BCD with a value within the range 0..99.
The range 0..65 should be assumed to be post 1999, and the range 66..99
to be pre 2000.
Example for year
| Value | Year represented |
|---|---|
| 0 | 2000 |
| 20 | 2020 |
| 40 | 2040 |
| 60 | 2060 |
| 65 | 2065 |
| 66 | 1966 |
| 80 | 1980 |
| 99 | 1999 |