pub fn take_timestamp(s: &str) -> Option<(&str, &str)>Expand description
Consume one Org timestamp or timestamp range at the start of s.
Manual 8.1: active <>, inactive [], diary sexps <%%(...)>,
time ranges on one stamp, and ranges of two stamps joined by --.
Repeaters (+1w, ++1w, .+1w) and warnings (-2d, --2d) live
inside the brackets, so the first closing delimiter is enough.