Fix length of string extraction for VALID FROM/UNTIL fields in ANTEX

[AndreHauschild]

No description provided.

[Hanbing59]

Hi Andre,

as the format specifications of the "VALID FROM" and "VALID UNTIL" are 5I6,F13.7,17X, would you think it make more sense to modify the line for extracting seconds to
sec = String::toDouble(line.substr(30, 13));
instead of (although your version should work actually all the time as well)
sec = String::toDouble(line.substr(33, 10));

Regards,
Hanbing