time handling might be wrong

[derhuerst]

I stumbled upon this because, when building gtfs-utils, I identifed this as a bug: GTFS Time values are defined relative to "12 hours before noon", so the implementation in this repo seems to fail during DST switches.

gtfs2lc/lib/ConnectionsBuilder.js

Lines 15 to 17 in cb0bdac

	const addDuration = function (date, duration) {
	return addSeconds(addMinutes(addHours(date, duration.hours), duration.minutes), duration.seconds);
	}

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related: google/transit#15