sameold,samedec: round purge times to 15 or 30 minutes#55
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Fix erroneous documentation on `MessageHeader::is_expired_at()`. * The maximum duration of SAME messages is 99.5 hours [1]… * … And we only need to be within ±90 days anyway. [1]: https://www.weather.gov/nwr/samealertduration
Previous versions of sameplace erroneously stated that the
expiration time of a SAME message was
issue datetime + purge duration
This is *almost* correct, but there's a catch:
* the expiration time is rounded to the nearest 15 minute
increment for durations ≤1 hour
* the expiration time is rounded to the nearest 30 minute
increment for longer-duration messages
Add `MessageHeader::purge_datetime()` to calculate this time, and
fix the incorrect `Message::is_expired_at()` implementation to
match. Documentation is given a touch-up.
Source the purge time from `MessageHeader::purge_datetime()` instead of calculating it directly. The rounding behavior will change the output.
cbs228
added
bug
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Previous versions of sameplace erroneously stated that the expiration time of a SAME message was
This is almost correct, but there's a catch:
the expiration time is rounded to the nearest 15 minute increment for durations ≤1 hour
the expiration time is rounded to the nearest 30 minute increment for longer-duration messages
the maximum duration of a SAME message is 99.5 hours 1
Add
MessageHeader::purge_datetime()to calculate this time, and fix the incorrectMessage::is_expired_at()implementation to match. Documentation is given a touch-up.This is an API-expanding change for sameold and will change samedec's
SAMEDEC_PURGETIMEvalues.