Use monotonic clock for status print.

#174.

main/gen_gdl90.go

@@ -1113,7 +1113,7 @@ func printStats() {
 		log.Printf(" - CPUTemp=%.02f deg C, MemStats.Alloc=%s, MemStats.Sys=%s, totalNetworkMessagesSent=%s\n", globalStatus.CPUTemp, humanize.Bytes(uint64(memstats.Alloc)), humanize.Bytes(uint64(memstats.Sys)), humanize.Comma(int64(totalNetworkMessagesSent)))
 		log.Printf(" - UAT/min %s/%s [maxSS=%.02f%%], ES/min %s/%s\n, Total traffic targets tracked=%s", humanize.Comma(int64(globalStatus.UAT_messages_last_minute)), humanize.Comma(int64(globalStatus.UAT_messages_max)), float64(maxSignalStrength)/10.0, humanize.Comma(int64(globalStatus.ES_messages_last_minute)), humanize.Comma(int64(globalStatus.ES_messages_max)), humanize.Comma(int64(len(seenTraffic))))
 		if globalSettings.GPS_Enabled {
-			log.Printf(" - Last GPS fix: %s, GPS solution type: %d using %d satellites (%d/%d seen/tracked), NACp: %d, est accuracy %.02f m\n", humanize.Time(mySituation.LastFixLocalTime), mySituation.quality, mySituation.Satellites, mySituation.SatellitesSeen, mySituation.SatellitesTracked, mySituation.NACp, mySituation.Accuracy)
+			log.Printf(" - Last GPS fix: %s, GPS solution type: %d using %d satellites (%d/%d seen/tracked), NACp: %d, est accuracy %.02f m\n", stratuxClock.HumanizeTime(mySituation.LastFixLocalTime), mySituation.quality, mySituation.Satellites, mySituation.SatellitesSeen, mySituation.SatellitesTracked, mySituation.NACp, mySituation.Accuracy)
 			log.Printf(" - GPS vertical velocity: %.02f ft/sec; GPS vertical accuracy: %v m\n", mySituation.GPSVertVel, mySituation.AccuracyVert)
 		}
 	}

main/monotonic.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	humanize "github.com/dustin/go-humanize"
 	"time"
 )
 
@@ -24,6 +25,10 @@ func (m *monotonic) Since(t time.Time) time.Duration {
 	return m.Time.Sub(t)
 }
 
+func (m *monotonic) HumanizeTime(t time.Time) string {
+	return humanize.RelTime(time.Time{}, t, "ago", "from now")
+}
+
 func NewMonotonic() *monotonic {
 	t := &monotonic{Seconds: 0, Time: time.Time{}, ticker: time.NewTicker(1 * time.Second)}
 	go t.Watcher()