Delta Time Zone (D) - Military Time

Delta Time Zone (D) corresponds to UTC+4, placing it four hours ahead of Coordinated Universal Time. It is mainly used in military, aviation, and maritime operations where precise, standardized timing is essential. Although not commonly used in everyday civilian language, Delta Time aligns with the standard time observed in regions such as the United Arab Emirates, Armenia, and western parts of Russia.

Importance and Global Use of Delta Time Zone

Delta Time plays a key role in ensuring coordinated communication across sectors that operate internationally—particularly defense, air traffic control, and naval logistics. By referencing a standard UTC+4 time, it reduces confusion when managing time-sensitive tasks across multiple zones.

In the civilian world, Delta Time overlaps with local time zones in countries along the Persian Gulf, Caucasus region, and western parts of Central Asia. Though not commonly labeled as "Delta" locally, its alignment with UTC+4 makes it a vital reference for weather reporting, global systems scheduling, and satellite operations requiring precise time standards.

Where and When Delta time is used worldwide

Delta Time (UTC+4) generally applies to regions located between 52.5° East and 67.5° East longitude. Though "Delta" is a military designation, it corresponds to local time zones operating at UTC+4.

Time entries often use the suffix "D", such as 08:00D or 0800D, pronounced "zero eight hundred Delta", to maintain consistency in global and mission-critical operations.

Some locations with the same time as Delta time:

• Abu Dhabi, United Arab Emirates
• Baku, Azerbaijan
• Dubai, United Arab Emirates
• Izhevsk, Udmurtia, Russia
• Muscat, Oman
• Port Louis, Mauritius
• Saint-Denis, Réunion
• Saint-Pierre, Réunion
• Salalah, Oman
• Samara, Russia
• Saratov, Russia
• Tbilisi, Georgia
• Ulyanovsk, Russia
• Vanadzor, Armenia
• Victoria, Seychelles
• Yerevan, Armenia

Other Time Zones in UTC +4

Other time zones share the same offset as Delta Time Zone (D), but are known by different names. While their clocks align, they may represent different regions or countries based on local time zone definitions.

• Armenia Time – AMT
• Azerbaijan Time – AZT
• Georgia Standard Time – GET
• Gulf Standard Time – GST
• Mauritius Time – MUT
• Reunion Time – RET
• Samara Time – SAMT
• Seychelles Time – SCT
• Volgograd Time – VOLT