Thursday, March 12, 2020

Почему синие или голубые самолёты на флайтрадаре

Синий/голубой цвет значит что трекинг самолёта идёт через спутник.

Why are some aircraft shown as blue on the map?

Aircraft displayed as blue icons are currently being tracked via satellite. Satellites are collecting the ADS-B signals from aircraft and transmitting them to the Flightradar24 network. Space-based ADS-B tracking will be used to supplement our terrestrial receiver network.

Thursday, October 3, 2019

Mongodb aggregate: convert date to another timezone

Mongo version 3.6 timezone operator in  dateToString

Mongo version 3.4 DateToString and Add:


"dateDays": {
"$dateToString": {
"format": "%Y-%m-%d",
"date": {
"$add": ["$date", -36000000]