What time does WhatsApp use for different time zones?
Your handset’s time zone. For example when it is 1 pm in UK, it is 6.30 pm in India. Suppose your friend from UK sends you a message at 1 pm. In your phone (if you are in India) the message will show the time 6.30 pm.
How do you interpret "local time" on airline tickets? Is it local time on the country of arrival or local time on the country of departure?
Both. The times listed as departure will be local time at departure in that actual city and the time listed as arrival will be that time in the arrival city. Any time you see the “local time” designation, just imagine that is the time wherever the aircraft physically is.
What is the time difference between the local times of Greenwich and a place at 180° longitude (in hours)?
Did you check similar questions before entering this one? This kind of question comes frequently with different longitudes and times.The answer depends on the latitude, which you don’t state, and also on the time of year.Take a look at Greg's time conversion answers and the time zone map at https://upload.wikimedia.org/wik..., and adapt the values:Find the time zone at Greenwich (a suburb of London). Depending on the time of year, it is GMT (effectively UTC) or BST (effectively UTC+1).Find a convenient time zone at 180°. From the map, you have the choice of UTC-12, UTC-11, UTC-10, UTC+12 and UTC+13. So the time difference is -13, -12, -11, -10, +11, +12 or +13 hours. Chris Spencer mentions the offset 12:45 of the Chatham Islands, but that doesn’t extend to 180°.Can you tell me why you asked this seemingly meaningless question? Do you have a teacher who has slept through the introduction of time zones 150 years ago?
How do we calculate the time difference between two countries?
The earth has 360 imaginary lines called longitudes or meridians running vertically between the poles. Each of these longitudes is called a degree. The 0 degree longitude passing through Greenwich, near London, is considered as standard and the time of all other time zones are calculated accordingly. The time difference between each longitude (each degree) is 4 minutes. So if it is 12 noon at Greenwich (0 degree), it would be 12:04 pm at 1 degree meridian and so on. In India, the standard meridian is 82-and-half degree. So the time difference between Greenwich and India is 82.5 x 4, which is 330 minutes (5 hours 30 minutes).
How do PST, EST, and CST differ?
That depends on which PST, EST and CST you’re talking about. Since they’re all used in the USA, I suppose you’re referring to US time zones. They correspond to UTC-8, UTC-5 and UTC-6 respectively; the number is the number of hours different from UTC. So at midnight UTC, it’s 16:00 PST, 19:00 EST and 18:00 CST on the previous day. Chinese CST is UTC+8, and Australian CST is UTC+9½, so the times there at the same instant would be 8:00 and 9:30 on the following day.
If it is 12 noon at Greenwich, calculate the local time of the places located on the following longitudes: 69°E, 30°W and 12°E?
every 1° is equal to 4 minutes.If it is on west of greenwich median than substract the calculated time from actual time of GMT and if it is on east than add.69°E = 69×4 = 276 minutes i.e 4 hours 36 minutes.time on greewich is 12:00 . so, time on 69°E is12 +4 hr 36 min = 16:36similarly in case of 30°west we have to substract the time i.e12 - 2 hrs = 10:00and for 12°E again add12+48 min = 12:48Hope this was helpful.Thanks for A2AP.STime I followed here is military time i.e 24 hours clock.East or west of longitudes measures from 0° i.e greenwich median line.