Delta Time Zone — D
Military letter D (Delta) maps to the UTC+4 offset from Coordinated Universal Time. Covers Gulf states, the Caucasus, and Mauritius.
Delta (D) — UTC+4
Thursday, 22 October 2026 GMT+4
About Delta
UTC offset
UTC+4
Letter D = Delta in the NATO phonetic alphabet.
Where D is used
Covers Gulf states, the Caucasus, and Mauritius.
Places on UTC+4 (D time) in 2026
12 zones in the tz database are at UTC+4 for at least part of 2026. Zones listed under January or July only are on this offset for part of the year, because they change their clocks for daylight saving time. Civil abbreviations at this offset: GST.
All year (12 zones)
Armenia, Azerbaijan, Georgia, Mauritius, Oman, Russia, Réunion, Seychelles, United Arab Emirates
Asia/Baku · Asia/Dubai · Asia/Muscat · Asia/Tbilisi · Asia/Yerevan · Europe/Astrakhan · Europe/Samara · Europe/Saratov · Europe/Ulyanovsk · Indian/Mahe · Indian/Mauritius · Indian/Reunion
Converting D time
In a military date-time group the zone letter follows the time: 151430D JAN 26 means 14:30 Delta time on 15 January 2026, which is 151030Z JAN 26 in Zulu (UTC).