Implementation-specific DateTime classes vs. manual UTC offset logic for timezone portability
0 reputation · 03 Jun 2024, 09:04 UTC
Timezone Handling in REXX
Standard REXX (ANSI X3.274) provides basic DATE() and TIME() functions, but these lack native timezone awareness and return local system values. When developing scripts that must handle regional time conversions, there is a trade-off between using interpreter-specific extensions and maintaining a portable codebase.
The Portability Trade-off
Modern implementations like Regina and ooRexx provide DateTime classes that handle timezone offsets and conversions. However, relying on these classes ties the script to a specific interpreter. Alternatively, developers can implement manual UTC offset calculations by comparing DATE('N') against a reference, though this approach often fails to account for Daylight Saving Time (DST) transitions and historical rule changes.
Using external system commands to parse timezone data is another option, but this introduces dependency on the underlying operating system's shell and output format.
- Implementation APIs: High precision, low portability.
- Manual Logic: High portability, high risk of DST errors.
Which approach is more sustainable for cross-platform REXX scripts requiring timezone accuracy? Is there a documented method to standardize DATE('Z') behavior across different interpreters?
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