Time, UTC and date-time groups — transcript

00:00:00.400 --> 00:00:03.404 Time, UTC and date-time groups.

00:00:04.400 --> 00:00:09.939 Aviation uses the 24-hour clock: no a.m. or p.m. Seventeen thirty is 5:

00:00:09.939 --> 00:00:14.171 30 in the afternoon. And it uses one shared time, UTC,

00:00:14.171 --> 00:00:17.017 written with a Z and spoken as Zulu.

00:00:18.400 --> 00:00:24.865 Australia has three standard time zones. Western is UTC plus eight. Central,

00:00:24.865 --> 00:00:31.750 plus nine and a half. Eastern, plus ten. So at zero two hundred UTC, it's 10 a.m.

00:00:31.750 --> 00:00:36.033 in Perth, 11:30 in Darwin, and midday in Brisbane.

00:00:36.383 --> 00:00:40.970 In summer, some states add an hour for daylight saving. Queensland,

00:00:40.970 --> 00:00:45.761 Western Australia and the Northern Territory don't. UTC never changes.

00:00:46.883 --> 00:00:51.267 A Brisbane client books you for 9:30 a.m. on the 21st of May.

00:00:51.267 --> 00:00:55.085 The forecasts and NOTAMs you'll check are all in UTC.

00:00:56.883 --> 00:01:02.760 Local to UTC: subtract the offset. Zero nine thirty, minus ten hours,

00:01:02.760 --> 00:01:09.897 drops below midnight. So add twenty-four and go back a day: twenty-three thirty UTC,

00:01:09.897 --> 00:01:10.989 on the 20th.

00:01:11.339 --> 00:01:15.753 Quick check. It's zero six hundred UTC. What time is it in Brisbane?

00:01:16.839 --> 00:01:19.660 Sixteen hundred. Add ten hours.

00:01:20.010 --> 00:01:25.374 Date-time groups put the date in front. Six figures give the day,

00:01:25.374 --> 00:01:31.388 then hours and minutes. NOTAM start and end times add the year and month:

00:01:31.388 --> 00:01:32.444 ten figures.

00:01:32.794 --> 00:01:39.289 In this Brisbane weather report, one five zero five three zero Zulu means the 15th,

00:01:39.289 --> 00:01:44.314 at zero five thirty UTC. Add ten: 3:30 p.m. local, the same day.

00:01:45.294 --> 00:01:48.116 Write both times, and both dates, in the job pack.

00:01:51.294 --> 00:01:58.347 Recap: 24-hour clock. Subtract for UTC. Watch the date. Read the group.

00:01:58.697 --> 00:02:03.383 Final check. A NOTAM starts at twenty-two hundred UTC on the 14th.

00:02:03.383 --> 00:02:05.202 When is that in Brisbane?

00:02:07.197 --> 00:02:11.194 Eight a.m. on the 15th. Add ten, and go forward a day.