Timezones
1937 Time Zones
The basic information for this table is found in Randy Jacobson's work, "Time Zones for Earhart Radio Message Database."
- From local to GMT
- To determine how to get back to GMT time from a local time, always add the offsets given below to get GMT time.
- From GMT to local
- Subtract the value of the offset from GMT to get the local time.
- Math reminders
- When we add negative numbers, the result is the same as subtracting the absolute value of the number from the base.
- 0000 GMT + (-1) = 0000 - 0100 = 2300
- When we subtract negative numbers, the result is the same as adding the absolute value of the number to the base.
- 0000 GMT - (-1) = 0000 + 0100 = 0100
- Dateline
- If your calculation is crossing the dateline, add a day if transiting east to west; subtract a day if the your calculation is transiting west to east.
- In the case of their last flight, Earhart and Noonan took off at 1000 hours on 2 July in Lae, which was 0000 GMT on 2 July in Greenwich. After flying for 14 hours from west to east, the aircraft would pass the midnight hour from July 2 to July 3 with respect to Lae, but when it crossed the dateline, it would then be "back" on July 2nd.
- Time Zone Conventions
The convention used in this table for Time Zone values is the opposite of the current UTC convention. Jacobson followed the convention used by navigators and the Navy. Time zones are positive because "they are interested in finding GMT, also known as GCT, UTC and Z (Zulu time), starting from the local time shown on the onboard clocks." In this convention, add the offset to the local time to derive Zulu (UTC) time.[1]
To convert to the UTC convention, change all of the positive offsets to negative numbers and all of the negative offsets to positive numbers.
| Ship/Place | Time of TZ Change | Time Zone offset from GMT |
|---|---|---|
| Baker | 11 | |
| Honolulu | 10.5 | |
| Howland | 10.5 | |
| Jarvis | 10.5 | |
| Lae | (-10) | |
| San Francisco | 8 | |
| Washington, DC | 5 | |
| London | (-1) | |
| American Samoa | 11 | |
| CINCUS | 8 | |
| COMINBATFOR | 10.5 | |
| COMDESCOFOR | 8 | |
| COMAIRBASEFOR | 8 | |
| COMBATSHIPS | 8 | |
| COMAIRBATFOR | 8 | |
| Duane | 13 Jan 1937 | 10.5 |
| 15 Jan 0530 | 11 | |
| 24 Jan 1300 | 10.5 | |
| Shoshone | March 10, 0700 | 10.5 (stays 10.5 for duration of first attempt) |
| Itasca | 19 June 0000 | 10.5 |
| 20 June 1400 | 11 | |
| 22 June 1400 | 11.5 | |
| 12 July 1400 | 12 | |
| 14 July 0000 | 11.5 | |
| 20 July 1400 | 11 | |
| 23 July 0800 | 10.5 | |
| Ontario | 17 June 1937 | 0700 11 |
| 18 June 0000 | 12 | |
| 20 June 1100 | (-12) | |
| 22 June 1800 | (-11) | |
| 5 July 0800 | -12 | |
| 7 July 1500 | 12 | |
| 9 July 1500 | 11 | |
| Swan | 1 July 0000 | 11 |
| 6 July 1300 | 11.5 | |
| 10 July 0300 | 11 | |
| 10 July 1700 | 11.5 | |
| 12 July 1900 | 12 | |
| 15 July 0000 | (-12) | |
| Colorado | 3 July 1400 | 10.5 |
| 4 July 4 1300 | 11 | |
| 7 July 1300 | 11.5 | |
| 14 July 1300 | 10.5 | |
|
Lexington |
1 July 1937 | 8 |
| 5 July 1600 | 9 | |
| 7 July 1600 | 10 | |
| 8 July 1030: | 10.5 | |
| 12 July | 11.5 | |
| 21 July | 10.5 |
International Date Line
- The International Date Line (IDL) is an imaginary line on the surface of the Earth, running between the north and south poles, that demarcates one calendar day from the next. It passes through the middle of the Pacific Ocean, roughly along the 180° longitude, opposite the Prime Meridian, but it is drawn with diversions to pass around some territories and island groups.
- In conjunction with the moving imaginary line opposite the sun corresponding to midnight, the IDL separates the two calendar days being used somewhere on earth most of the time, 22 hours out of each 24. Three different calendar days are in simultaneous use during a two-hour period between 10:00 and 11:59 (UTC) each day, due to the use of additional date-shifted time zones in a few areas affected by substantial deviations of the date line from the 180th meridian. The use of these additional time zones also precludes the possibility of the entire planet observing only a single date at the instant when midnight crosses the IDL.
- In the absence of a simultaneous time zone change, a traveler crossing the IDL eastbound subtracts one day, or 24 hours, so that the the calendar date to the west of the line is repeated. Crossing the IDL westbound results in 24 hours being added, advancing the calendar date by one day. The line is necessary in order to have a fixed, albeit arbitrary, boundary on the globe where the calendar date advances in the westbound direction.
Meditation on the Date Line
- A day represents one rotation of the earth around its own axis.
- There are only 24 hours in a day.
- Each hour on the clock represents a "time zone" covered on the face of the earth by the apparent movement of the sun over that region or by the logical "movement" of a timeline circling the earth at the rate of 24 hours per day. One hour of time = one time zone on the map.
- The apparent motion of the sun around the earth is from east to west. Comparing any two time zones that are side-by-side, the eastern time zone will be ahead of the western time zone by one hour. The eastern time zone gets the sun (or midnight) one hour before the time zone to the west of it.
- No matter where one chooses to begin the count of 24 hours and 24 time zones, the 24th time zone will always end up right next to the first time zone. In terms of the apparent motion of the sun or the logical "motion" of midnight, the 24th time zone is only one hour ahead of the first time zone on the clock, but it is 24 hours behind the first time zone on the calendar.
- The International Date Line divides the UTC+12 (or UTC-12) time zone into two parts. On the western side of the line (UTC+12), it is one full calendar day (24 hours) ahead of the eastern side of the line (UTC-12).
- The time of day is the same, but the date is different. People who cross the line from west to east do not have to change their clocks; they do have to change the day's date,
- For example:
- 3 July 0000 UTC+12, west of the dateline = 2 July 0000 UTC-12, east of the dateline
24 hours, 25 time zones
The UTC convention actually has 25 time. Twelve are west of Greenwich (UTC ± 0), UTC-1 .. UTC -12. Twelve are east of Greenwich, UTC+1 .. UTC+12.
- 12 west + 12 east + 1 at 0 = 25 time zones.
UTC-12 gives the same time of day as UTC+12. If it is 0000 UTC, then it is 1200 (noon) at UTC-12 and 1200 (noon) at UTC+12. As noted above, that time zone is divided by the date line, so that even though it is the same time of day at UTC-12 and UTC+12, it is a different day of the week and a different date on the calendar. UTC+12 is exactly one full day ahead of UTC-12.
To get the UTC time from a local time zone, subtract the offset from the local time.
- Monday 2020 EST - (-5) = 0120 Tuesday UTC. I know it is the next day because my calculation took me past midnight. Tuesday arrives in the Zulu time zone before it gets here five hours later.
- Monday 0920 Lae - 10 = Sunday 2320 UTC on the previous day. I know it is the day before because I had to cross midnight heading in the other direction from my first example. Monday arrives in Lae 10 hours before it reaches the Zulu time zone.
To get to a local time zone from UTC, add the offset from the UTC time.
- Wednesday 1400 UTC + (-5) = Wednesday 0900 EST
- Wednesday 1400 UTC + 10 = Thursday 0000 Lae.
| Name | Includes | Offset |
|---|---|---|
| M/Y |
|
UTC-12 |
| X-ray | UTC-11 | |
| Whiskey | UTC-10 | |
| Victor | UTC-9 | |
| Uniform |
PST--Pacific Standard Time
|
UTC-8 |
| Tango |
MST--Mountain Standard Time
|
UTC-7 |
| Sierra |
CST--Central Standard Time
|
UTC-6 |
| Romeo |
EST--Eastern Standard Time
|
UTC-5 |
| Quebec | UTC-4 | |
| Papa | UTC-3 | |
| Oscar | UTC-2 | |
| November | UTC-1 | |
| Zulu |
|
UTC±00 |
| Alpha | UTC+1 | |
| Bravo | UTC+2 | |
| Charlie | UTC+3 | |
| Delta | UTC+4 | |
| Echo | UTC+5 | |
| Foxtrot | UTC+6 | |
| Golf | UTC+7 | |
| Hotel | UTC+8 | |
| India |
|
UTC+9 |
| Kilo |
Port Moresby, Papua New Guinea
|
UTC+10 |
| Lima | UTC+11 | |
| M/Y |
|
UTC+12 |
Selected table of times and dates
| GMT | Lae UTC+10 | Itasca UTC-11.5 | PST UTC-8 | EST UTC-5 |
|---|---|---|---|---|
| 29-6 0500 GMT | 29-6 1500 Lae | 28-6 1730 Ita | 28-6 2100 PST | 29-6 0000 EST |
| 29-6 0600 GMT | 29-6 1600 Lae | 28-6 1830 Ita | 28-6 2200 PST | 29-6 0100 EST |
| 29-6 0700 GMT | 29-6 1700 Lae | 28-6 1930 Ita | 28-6 2300 PST | 29-6 0200 EST |
| 29-6 0800 GMT | 29-6 1800 Lae | 28-6 2030 Ita | 29-6 0000 PST | 29-6 0300 EST |
| 29-6 0900 GMT | 29-6 1900 Lae | 28-6 2130 Ita | 29-6 0100 PST | 29-6 0400 EST |
| 29-6 1000 GMT | 29-6 2000 Lae | 28-6 2230 Ita | 29-6 0200 PST | 29-6 0500 EST |
| 29-6 1100 GMT | 29-6 2100 Lae | 28-6 2330 Ita | 29-6 0300 PST | 29-6 0600 EST |
| 29-6 1200 GMT | 29-6 2200 Lae | 29-6 0030 Ita | 29-6 0400 PST | 29-6 0700 EST |
| 29-6 1300 GMT | 29-6 2300 Lae | 29-6 0130 Ita | 29-6 0500 PST | 29-6 0800 EST |
| 29-6 1400 GMT | 30-6 0000 Lae | 29-6 0230 Ita | 29-6 0600 PST | 29-6 0900 EST |
| 29-6 1500 GMT | 30-6 0100 Lae | 29-6 0330 Ita | 29-6 0700 PST | 29-6 1000 EST |
| 29-6 1600 GMT | 30-6 0200 Lae | 29-6 0430 Ita | 29-6 0800 PST | 29-6 1100 EST |
| 29-6 1700 GMT | 30-6 0300 Lae | 29-6 0530 Ita | 29-6 0900 PST | 29-6 1200 EST |
| 29-6 1800 GMT | 30-6 0400 Lae | 29-6 0630 Ita | 29-6 1000 PST | 29-6 1300 EST |
| 29-6 1900 GMT | 30-6 0500 Lae | 29-6 0730 Ita | 29-6 1100 PST | 29-6 1400 EST |
| 29-6 2000 GMT | 30-6 0600 Lae | 29-6 0830 Ita | 29-6 1200 PST | 29-6 1500 EST |
| 29-6 2100 GMT | 30-6 0700 Lae | 29-6 0930 Ita | 29-6 1300 PST | 29-6 1600 EST |
| 29-6 2200 GMT | 30-6 0800 Lae | 29-6 1030 Ita | 29-6 1400 PST | 29-6 1700 EST |
| 29-6 2300 GMT | 30-6 0900 Lae | 29-6 1130 Ita | 29-6 1500 PST | 29-6 1800 EST |
| 30-6 0000 GMT | 30-6 1000 Lae | 29-6 1230 Ita | 29-6 1600 PST | 29-6 1900 EST |
| 30-6 0100 GMT | 30-6 1100 Lae | 29-6 1330 Ita | 29-6 1700 PST | 29-6 2000 EST |
| 30-6 0200 GMT | 30-6 1200 Lae | 29-6 1430 Ita | 29-6 1800 PST | 29-6 2100 EST |
| 30-6 0300 GMT | 30-6 1300 Lae | 29-6 1530 Ita | 29-6 1900 PST | 29-6 2200 EST |
| 30-6 0400 GMT | 30-6 1400 Lae | 29-6 1630 Ita | 29-6 2000 PST | 29-6 2300 EST |
| 30-6 0500 GMT | 30-6 1500 Lae | 29-6 1730 Ita | 29-6 2100 PST | 30-6 0000 EST |
| 30-6 0600 GMT | 30-6 1600 Lae | 29-6 1830 Ita | 29-6 2200 PST | 30-6 0100 EST |
| 30-6 0700 GMT | 30-6 1700 Lae | 29-6 1930 Ita | 29-6 2300 PST | 30-6 0200 EST |
| 30-6 0800 GMT | 30-6 1800 Lae | 29-6 2030 Ita | 30-6 0000 PST | 30-6 0300 EST |
| 30-6 0900 GMT | 30-6 1900 Lae | 29-6 2130 Ita | 30-6 0100 PST | 30-6 0400 EST |
| 30-6 1000 GMT | 30-6 2000 Lae | 29-6 2230 Ita | 30-6 0200 PST | 30-6 0500 EST |
| 30-6 1100 GMT | 30-6 2100 Lae | 29-6 2330 Ita | 30-6 0300 PST | 30-6 0600 EST |
| 30-6 1200 GMT | 30-6 2200 Lae | 30-6 0030 Ita | 30-6 0400 PST | 30-6 0700 EST |
| 30-6 1300 GMT | 30-6 2300 Lae | 30-6 0130 Ita | 30-6 0500 PST | 30-6 0800 EST |
| 30-6 1400 GMT | 1-7 0000 Lae | 30-6 0230 Ita | 30-6 0600 PST | 30-6 0900 EST |
| 30-6 1500 GMT | 1-7 0100 Lae | 30-6 0330 Ita | 30-6 0700 PST | 30-6 1000 EST |
| 30-6 1600 GMT | 1-7 0200 Lae | 30-6 0430 Ita | 30-6 0800 PST | 30-6 1100 EST |
| 30-6 1700 GMT | 1-7 0300 Lae | 30-6 0530 Ita | 30-6 0900 PST | 30-6 1200 EST |
| 30-6 1800 GMT | 1-7 0400 Lae | 30-6 0630 Ita | 30-6 1000 PST | 30-6 1300 EST |
| 30-6 1900 GMT | 1-7 0500 Lae | 30-6 0730 Ita | 30-6 1100 PST | 30-6 1400 EST |
| 30-6 2000 GMT | 1-7 0600 Lae | 30-6 0830 Ita | 30-6 1200 PST | 30-6 1500 EST |
| 30-6 2100 GMT | 1-7 0700 Lae | 30-6 0930 Ita | 30-6 1300 PST | 30-6 1600 EST |
| 30-6 2200 GMT | 1-7 0800 Lae | 30-6 1030 Ita | 30-6 1400 PST | 30-6 1700 EST |
| 30-6 2300 GMT | 1-7 0900 Lae | 30-6 1130 Ita | 30-6 1500 PST | 30-6 1800 EST |
| 1-7 0000 GMT | 1-7 1000 Lae | 30-6 1230 Ita | 30-6 1600 PST | 30-6 1900 EST |
| 1-7 0100 GMT | 1-7 1100 Lae | 30-6 1330 Ita | 30-6 1700 PST | 30-6 2000 EST |
| 1-7 0200 GMT | 1-7 1200 Lae | 30-6 1430 Ita | 30-6 1800 PST | 30-6 2100 EST |
| 1-7 0300 GMT | 1-7 1300 Lae | 30-6 1530 Ita | 30-6 1900 PST | 30-6 2200 EST |
| 1-7 0400 GMT | 1-7 1400 Lae | 30-6 1630 Ita | 30-6 2000 PST | 30-6 2300 EST |
| 1-7 0500 GMT | 1-7 1500 Lae | 30-6 1730 Ita | 30-6 2100 PST | 1-7 0000 EST |
| 1-7 0600 GMT | 1-7 1600 Lae | 30-6 1830 Ita | 30-6 2200 PST | 1-7 0100 EST |
| 1-7 0700 GMT | 1-7 1700 Lae | 30-6 1930 Ita | 30-6 2300 PST | 1-7 0200 EST |
| 1-7 0800 GMT | 1-7 1800 Lae | 30-6 2030 Ita | 1-7 0000 PST | 1-7 0300 EST |
| 1-7 0900 GMT | 1-7 1900 Lae | 30-6 2130 Ita | 1-7 0100 PST | 1-7 0400 EST |
| 1-7 1000 GMT | 1-7 2000 Lae | 30-6 2230 Ita | 1-7 0200 PST | 1-7 0500 EST |
| 1-7 1100 GMT | 1-7 2100 Lae | 30-6 2330 Ita | 1-7 0300 PST | 1-7 0600 EST |
| 1-7 1200 GMT | 1-7 2200 Lae | 1-7 0030 Ita | 1-7 0400 PST | 1-7 0700 EST |
| 1-7 1300 GMT | 1-7 2300 Lae | 1-7 0130 Ita | 1-7 0500 PST | 1-7 0800 EST |
| 1-7 1400 GMT | 2-7 0000 Lae | 1-7 0230 Ita | 1-7 0600 PST | 1-7 0900 EST |
| 1-7 1500 GMT | 2-7 0100 Lae | 1-7 0330 Ita | 1-7 0700 PST | 1-7 1000 EST |
| 1-7 1600 GMT | 2-7 0200 Lae | 1-7 0430 Ita | 1-7 0800 PST | 1-7 1100 EST |
| 1-7 1700 GMT | 2-7 0300 Lae | 1-7 0530 Ita | 1-7 0900 PST | 1-7 1200 EST |
| 1-7 1800 GMT | 2-7 0400 Lae | 1-7 0630 Ita | 1-7 1000 PST | 1-7 1300 EST |
| 1-7 1900 GMT | 2-7 0500 Lae | 1-7 0730 Ita | 1-7 1100 PST | 1-7 1400 EST |
| 1-7 2000 GMT | 2-7 0600 Lae | 1-7 0830 Ita | 1-7 1200 PST | 1-7 1500 EST |
| 1-7 2100 GMT | 2-7 0700 Lae | 1-7 0930 Ita | 1-7 1300 PST | 1-7 1600 EST |
| 1-7 2200 GMT | 2-7 0800 Lae | 1-7 1030 Ita | 1-7 1400 PST | 1-7 1700 EST |
| 1-7 2300 GMT | 2-7 0900 Lae | 1-7 1130 Ita | 1-7 1500 PST | 1-7 1800 EST |
| 2-7 0000 GMT | 2-7 1000 Lae | 1-7 1230 Ita | 1-7 1600 PST | 1-7 1900 EST |
| 2-7 0100 GMT | 2-7 1100 Lae | 1-7 1330 Ita | 1-7 1700 PST | 1-7 2000 EST |
| 2-7 0200 GMT | 2-7 1200 Lae | 1-7 1430 Ita | 1-7 1800 PST | 1-7 2100 EST |
| 2-7 0300 GMT | 2-7 1300 Lae | 1-7 1530 Ita | 1-7 1900 PST | 1-7 2200 EST |
| 2-7 0400 GMT | 2-7 1400 Lae | 1-7 1630 Ita | 1-7 2000 PST | 1-7 2300 EST |
| 2-7 0500 GMT | 2-7 1500 Lae | 1-7 1730 Ita | 1-7 2100 PST | 2-7 0000 EST |
| 2-7 0600 GMT | 2-7 1600 Lae | 1-7 1830 Ita | 1-7 2200 PST | 2-7 0100 EST |
| 2-7 0700 GMT | 2-7 1700 Lae | 1-7 1930 Ita | 1-7 2300 PST | 2-7 0200 EST |
| 2-7 0800 GMT | 2-7 1800 Lae | 1-7 2030 Ita | 2-7 0000 PST | 2-7 0300 EST |
| 2-7 0900 GMT | 2-7 1900 Lae | 1-7 2130 Ita | 2-7 0100 PST | 2-7 0400 EST |
| 2-7 1000 GMT | 2-7 2000 Lae | 1-7 2230 Ita | 2-7 0200 PST | 2-7 0500 EST |
| 2-7 1100 GMT | 2-7 2100 Lae | 1-7 2330 Ita | 2-7 0300 PST | 2-7 0600 EST |
| 2-7 1200 GMT | 2-7 2200 Lae | 2-7 0030 Ita | 2-7 0400 PST | 2-7 0700 EST |
| 2-7 1300 GMT | 2-7 2300 Lae | 2-7 0130 Ita | 2-7 0500 PST | 2-7 0800 EST |
| 2-7 1400 GMT | 3-7 0000 Lae | 2-7 0230 Ita | 2-7 0600 PST | 2-7 0900 EST |
| 2-7 1500 GMT | 3-7 0100 Lae | 2-7 0330 Ita | 2-7 0700 PST | 2-7 1000 EST |
| 2-7 1600 GMT | 3-7 0200 Lae | 2-7 0430 Ita | 2-7 0800 PST | 2-7 1100 EST |
| 2-7 1700 GMT | 3-7 0300 Lae | 2-7 0530 Ita | 2-7 0900 PST | 2-7 1200 EST |
| 2-7 1800 GMT | 3-7 0400 Lae | 2-7 0630 Ita | 2-7 1000 PST | 2-7 1300 EST |
| 2-7 1900 GMT | 3-7 0500 Lae | 2-7 0730 Ita | 2-7 1100 PST | 2-7 1400 EST |
| 2-7 2000 GMT | 3-7 0600 Lae | 2-7 0830 Ita | 2-7 1200 PST | 2-7 1500 EST |
| 2-7 2100 GMT | 3-7 0700 Lae | 2-7 0930 Ita | 2-7 1300 PST | 2-7 1600 EST |
| 2-7 2200 GMT | 3-7 0800 Lae | 2-7 1030 Ita | 2-7 1400 PST | 2-7 1700 EST |
| 2-7 2300 GMT | 3-7 0900 Lae | 2-7 1130 Ita | 2-7 1500 PST | 2-7 1800 EST |
| 3-7 0000 GMT | 3-7 1000 Lae | 2-7 1230 Ita | 2-7 1600 PST | 2-7 1900 EST |
| 3-7 0100 GMT | 3-7 1100 Lae | 2-7 1330 Ita | 2-7 1700 PST | 2-7 2000 EST |
| 3-7 0200 GMT | 3-7 1200 Lae | 2-7 1430 Ita | 2-7 1800 PST | 2-7 2100 EST |
| 3-7 0300 GMT | 3-7 1300 Lae | 2-7 1530 Ita | 2-7 1900 PST | 2-7 2200 EST |
Ric's Cheatsheet
| -12 | -11.5 | -11 | -10.5 | -8 | -7 | -6 | -5 | Greenwich | +9 | +10 | +11 | +12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Date Line | Itasca | Baker | Honolulu | Oakland | Denver | Chicago | NYC | UTC | Darwin | Lae | Wake | Tarawa |
| Howland | PST | MST | CST | EST | ||||||||
| 12:00 | 12:30 | 13:00 | 13:30 | 16:00 | 17:00 | 18:00 | 19:00 | 00:00 | 09:00 | 10:00 | 11:00 | 12:00 |
| 13:00 | 13:30 | 14:00 | 14:30 | 17:00 | 18:00 | 19:00 | 20:00 | 01:00 | 10:00 | 11:00 | 12:00 | 13:00 |
| 14:00 | 14:30 | 15:00 | 15:30 | 18:00 | 19:00 | 20:00 | 21:00 | 02:00 | 11:00 | 12:00 | 13:00 | 14:00 |
| 15:00 | 15:30 | 16:00 | 16:30 | 19:00 | 20:00 | 21:00 | 22:00 | 03:00 | 12:00 | 13:00 | 14:00 | 15:00 |
| 16:00 | 16:30 | 17:00 | 17:30 | 20:00 | 21:00 | 22:00 | 23:00 | 04:00 | 13:00 | 14:00 | 15:00 | 16:00 |
| 17:00 | 17:30 | 18:00 | 18:30 | 21:00 | 22:00 | 23:00 | 00:00 | 05:00 | 14:00 | 15:00 | 16:00 | 17:00 |
| 18:00 | 18:30 | 19:00 | 19:30 | 22:00 | 23:00 | 00:00 | 01:00 | 06:00 | 15:00 | 16:00 | 17:00 | 18:00 |
| 19:00 | 19:30 | 20:00 | 20:30 | 23:00 | 00:00 | 01:00 | 02:00 | 07:00 | 16:00 | 17:00 | 18:00 | 19:00 |
| 20:00 | 20:30 | 21:00 | 21:30 | 00:00 | 01:00 | 02:00 | 03:00 | 08:00 | 17:00 | 18:00 | 19:00 | 20:00 |
| 21:00 | 21:30 | 22:00 | 22:30 | 01:00 | 02:00 | 03:00 | 04:00 | 09:00 | 18:00 | 19:00 | 20:00 | 21:00 |
| 22:00 | 22:30 | 23:00 | 23:30 | 02:00 | 03:00 | 04:00 | 05:00 | 10:00 | 19:00 | 20:00 | 21:00 | 22:00 |
| 23:00 | 23:30 | 00:00 | 00:30 | 03:00 | 04:00 | 05:00 | 06:00 | 11:00 | 20:00 | 21:00 | 22:00 | 23:00 |
| 00:00 | 00:30 | 01:00 | 01:30 | 04:00 | 05:00 | 06:00 | 07:00 | 12:00 | 21:00 | 22:00 | 23:00 | 00:00 |
| 01:00 | 01:30 | 02:00 | 02:30 | 05:00 | 06:00 | 07:00 | 08:00 | 13:00 | 22:00 | 23:00 | 00:00 | 01:00 |
| 02:00 | 02:30 | 03:00 | 03:30 | 06:00 | 07:00 | 08:00 | 09:00 | 14:00 | 23:00 | 00:00 | 01:00 | 02:00 |
| 03:00 | 03:30 | 04:00 | 04:30 | 07:00 | 08:00 | 09:00 | 10:00 | 15:00 | 00:00 | 01:00 | 02:00 | 03:00 |
| 04:00 | 04:30 | 05:00 | 05:30 | 08:00 | 09:00 | 10:00 | 11:00 | 16:00 | 01:00 | 02:00 | 03:00 | 04:00 |
| 05:00 | 05:30 | 06:00 | 06:30 | 09:00 | 10:00 | 11:00 | 12:00 | 17:00 | 02:00 | 03:00 | 04:00 | 05:00 |
| 06:00 | 06:30 | 07:00 | 07:30 | 10:00 | 11:00 | 12:00 | 13:00 | 18:00 | 03:00 | 04:00 | 05:00 | 06:00 |
| 07:00 | 07:30 | 08:00 | 08:30 | 11:00 | 12:00 | 13:00 | 14:00 | 19:00 | 04:00 | 05:00 | 06:00 | 07:00 |
| 08:00 | 08:30 | 09:00 | 09:30 | 12:00 | 13:00 | 14:00 | 15:00 | 20:00 | 05:00 | 06:00 | 07:00 | 08:00 |
| 09:00 | 09:30 | 10:00 | 10:30 | 13:00 | 14:00 | 15:00 | 16:00 | 21:00 | 06:00 | 07:00 | 08:00 | 09:00 |
| 10:00 | 10:30 | 11:00 | 11:30 | 14:00 | 15:00 | 16:00 | 17:00 | 22:00 | 07:00 | 08:00 | 09:00 | 10:00 |
| 11:00 | 11:30 | 12:00 | 12:30 | 15:00 | 16:00 | 17:00 | 18:00 | 23:00 | 08:00 | 09:00 | 10:00 | 11:00 |
| 12:00 | 12:30 | 13:00 | 13:30 | 16:00 | 17:00 | 18:00 | 19:00 | 00:00 | 09:00 | 10:00 | 11:00 | 12:00 |
References
- ↑ Gary LaPook, Forum.
- ↑ "Coordinated Universal Time (UTC)." "UTC" is an arbitrary name created to avoid relying on any particular language for the acronym.