UTC+07:00

Discrepancies between official UTC+07:00 and geographical UTC+07:00

Since legal, political, and economic in addition to physical or geographical criteria are used in the drawing of time zones, it follows that official time zones do not precisely adhere to meridian lines. The UTC+07:00 time zone, were it drawn by purely geographical terms, would consist of exactly the area between meridians 97°30′ E and 112°30′ E. As a result, there are places which, despite lying in an area with a "physical" UTC+07:00 time, actually use another time zone. Conversely, there are areas that have adopted UTC+07:00, even though their "physical" time zone is UTC+08:00, UTC+06:00, or even UTC+05:00.

Areas within UTC+07:00 longitudes using other time zones

This concerns areas within 97°30′ E to 112°30′ E longitude.

Using UTC+06:30:

• Eastern part of Myanmar

Using UTC+08:00:

• In China, many parts of central China including these provinces:
  • Hainan
  • Guangxi
  • Yunnan
  • Guizhou
  • Sichuan
  • Chongqing
  • Shaanxi
  • Ningxia
  • Gansu
  • Western two-thirds of Hunan
  • Western half of:
    • Hubei
    • Shanxi
  • Inner Mongolia, including its capital Hohhot
  • Western third of:
    • Guangdong
    • Henan

• In Russia:
  • Irkutsk Oblast
  • Buryatia
• Outside China & Russia:
  • Most of central Mongolia including the capital Ulaanbaatar
  • Peninsular Malaysia
  • Western part of Sarawak in Malaysian Borneo including Kuching
  • Singapore

Using UTC+09:00:

• A (western) part Sakha Republic in Russia, including the urban localities Aykhal and Udachny

Areas outside UTC+07:00 longitudes using UTC+07:00 time

Areas between 67°30′ E and 97°30′ E ("physical" UTC+05:00 and UTC+06:00)

• The westernmost part of Indonesia including most of the province Aceh with its capital Banda Aceh.
• The westernmost part of Mongolia
• Parts of Russia:
  • A large part of Krasnoyarsk Krai
  • Tuva
  • Khakassia
  • Altai Republic
  • Altai Krai
  • Kemerovo Oblast
  • Novosibirsk Oblast (mostly within the "physical" UTC+05:00 area)
  • Tomsk Oblast (partly within the "physical" UTC+05:00 area)

Areas between 112°30′ E and 127°30′ E ("physical" UTC+08:00)

• In Indonesia:
  • The easternmost part of Java including East Java's capital Surabaya, Sidoarjo, Malang, and Banyuwangi.
  • The island of Bawean and Madura, and islands of Kangean and Masalembu, which administratively belong to East Java Province.
  • Eastern part of West Kalimantan, and most of Central Kalimantan, including the capital Palangka Raya
• In Russia:
  • The very easternmost part of Krasnoyarsk Krai

Historical time offsets

The Republic of China's offset for this time zone was Kansu-Szechwan, and was used until 1949, when the Chinese Communist Party took control of Mainland China following the Chinese Civil War and made UTC+08:00 the standard time for all areas under its control. Formerly, from 1918 to 1949, this time offset was used in eastern Xikang and Qinghai, central Outer Mongolia (1921–1924), and all of Yunnan, Guangxi, Guizhou, Ningxia, Suiyuan, Gansu, Sichuan, and Shaanxi.

This time zone was also the standard time in Malaysia and Singapore between 1 June 1905 and 31 December 1932.

From 1964 to 1987, Bali used this time zone. The issuance of President Decree 41/1987 meant that the province's clocks sprang forward by one hour, thereby synchronising its mean time with other provinces in the Lesser Sunda Islands.