# Output: stdout: integer seconds until next hour
# Output: exit code 0 if stdout > 0; 1 if stdout = 0; 2 if stdout < 0
# Usage: timeUntilNextHour
# Usage: if ! myTTL="$(timeUntilNextHour)"; then yell "ERROR in if statement"; exit 1; fi
# Output: stdout: integer seconds until next hour
# Output: exit code 0 if stdout > 0; 1 if stdout = 0; 2 if stdout < 0
# Usage: timeUntilNextHour
# Usage: if ! myTTL="$(timeUntilNextHour)"; then yell "ERROR in if statement"; exit 1; fi
local returnState TIME_CURRENT TIME_NEXT_HOUR SECONDS_UNTIL_NEXT_HOUR
TIME_CURRENT="$(date --iso-8601=seconds)"; # Produce `date`-parsable current timestamp with resolution of 1 second.
TIME_NEXT_HOUR="$(date -d "$TIME_CURRENT next hour" --iso-8601=hours)"; # Produce `date`-parsable current time stamp with resolution of 1 second.
local returnState TIME_CURRENT TIME_NEXT_HOUR SECONDS_UNTIL_NEXT_HOUR
TIME_CURRENT="$(date --iso-8601=seconds)"; # Produce `date`-parsable current timestamp with resolution of 1 second.
TIME_NEXT_HOUR="$(date -d "$TIME_CURRENT next hour" --iso-8601=hours)"; # Produce `date`-parsable current time stamp with resolution of 1 second.
yell "WARNING:Reported time until next hour exactly zero.";
elif [[ "$SECONDS_UNTIL_NEXT_HOUR" -lt 0 ]]; then
yell "WARNING:Reported time until next hour exactly zero.";
elif [[ "$SECONDS_UNTIL_NEXT_HOUR" -lt 0 ]]; then
yell "WARNING:Reported time until next hour is negative.";
fi
try echo "$SECONDS_UNTIL_NEXT_HOUR"; # Report
yell "WARNING:Reported time until next hour is negative.";
fi
try echo "$SECONDS_UNTIL_NEXT_HOUR"; # Report