Let me set the scene — Page 422, Lesson 376

I want to walk you through what we call Standard Times — the official clock times that countries and regions adopt, and this is the kind of table you'll actually use in flight planning. Let me set the scene. The whole world is divided into time zones, but the zones aren't neat strips. Political borders, islands, and practical decisions mean each place picks a standard time that's a whole number of hours ahead of or behind Greenwich. This table lists those standard times, and the numbers you see are the hours you add to or subtract from UTC — Coordinated Universal Time — to get local standard time. Now, here's the critical part for you as a pilot. The table is corrected to June 1988. That's a warning. Standard times change — countries shift their zones, they adopt or drop daylight saving. So this table is a snapshot, not a permanent law. In real operations you always check current publications, not a 1988 list. But the structure of how these times work is exactly what you need to understand. Let me read the table the way you'll read it. Take the Leeward Islands — that's 04. That means local standard time is UTC plus 4 hours. If it's 12:00 UTC, it's 16:00 there. Now look at the Marquesas Islands — 09 30. That's 9 hours 30 minutes. Not every zone is a whole hour. Some are half-hour offsets, and you must respect that half hour in your calculations. Pitcairn Island is 08 30, also a half-hour offset. So when you see two numbers, the first is hours, the second is minutes. Now, the United States section is where this gets genuinely interesting, because one country has many zones. Look at the layout. Each state is listed with a number. Alabama is 06, California is 08, New York is 05. That's because the US spans multiple time zones — the east coast is UTC minus 5, the central states minus 6, the mountain states minus 7, the west coast minus 8. So the table isn't giving you one time for the US; it's giving you the zone for each state. And there are footnotes that change everything. Look at footnote 2. It says summer time — daylight-saving time — one hour fast on the time given, is kept in these states from the first Sunday in April to the last Sunday in October, changing at 02h00m local clock time. So the states marked with a superscript 2 — and you'll see many of them are — add one hour during that summer period. The time given is the standard time; in summer you add one hour. And the change happens at 02:00 local clock time on those specific Sundays. That's the exact mechanism you need to know for planning a flight across a state line in April or October. Footnote 3 says "This applies to the greater portion of the state." So some states are split — the number given covers most of the state, but not all of it. Indiana is marked 3, and it's listed as 05. Michigan is 2,3 and 05. So you can't assume a whole state is one zone; you check the footnote. Now look at Alaska, because it's a beautiful example of a longitude boundary. Alaska, east of longitude W 169°30' — that's 09. The Aleutian Islands, west of W 169°30' — that's 10. So within one state, the time changes at a specific meridian: 169 degrees 30 minutes west. East of that line, UTC minus 9; west of it, UTC minus 10. That's a real navigational boundary you'd cross on a flight, and the table gives you the exact longitude. Mexico has footnote 1, which is a list of exceptions. The general time is 06, but the states of Sonora, Sinaloa, Nayarit, and the Southern District of Lower California keep 07 hours, and the Northern District of Lower California keeps 08 hours. So Mexico isn't one time — it's a base of 06 with specific regions at 07 and one at 08. You have to know which part of the country you're flying into. Now the asterisk. You see Paraguay, Uruguay, Trinidad Island, Turks and Caicos Islands. The footnote at the bottom says: summer time may be kept in these countries. That's different from the US footnote. For the US states, summer time is a definite rule with exact dates. For these asterisked places, summer time may be kept — it's optional, it varies. So for those, you can't assume; you check current information for whether they're on summer time at your flight date. Let me also point out the half-hour and odd offsets in the island groups, because they're easy to miss. Niue is 11, Samoa is 11, Society Islands is 10, Tuamotu Archipelago is 10, Tubuai Islands is 10. These are all UTC minus values in the Pacific. And note the Marquesas at 09 30 — that half hour is a real thing you'd compute into your ETA. Here's the practical takeaway for navigation. When you plan a flight, you take your UTC time — which is what your instruments and flight plans use — and you apply the zone offset from this table to get local time at your destination. If the destination is on summer time, you add the extra hour. If it's an asterisked country, you verify. If it's a split state like Alaska, you use the longitude to decide which offset applies. And you never trust a 1988 table for current operations — you use it to understand the structure, then check the current data. Let me show you the International Date Line, because it's the boundary that makes all of this click together. That figure shows you the actual path of the Date Line through the Pacific. Notice it doesn't run straight down the 180th meridian — it bends around island groups. That's exactly why the table lists places like Samoa at 11 and Niue at 11, and why the Marquesas are at 09 30. The Date Line's bends are political decisions, and the standard times follow those decisions. When you cross that line going west, you add a day; going east, you subtract a day. The table's offsets are the local expression of that global rule. And here's the UTC connection. This figure shows how Local Mean Time relates to Coordinated Universal Time. The core idea is that UTC is the reference — the zero point — and every standard time in this table is defined as an offset from it. Your job as a navigator is to convert between the two correctly, and this table is your conversion key, with all its footnotes and exceptions. So when you look at this table, don't just read numbers. Read the structure: whole-hour zones, half-hour zones, states split by longitude, summer-time rules with exact dates, and optional summer time marked by asterisks. That's the full picture of how the world keeps time, and it's exactly what you'll apply on every international flight you plan.