AIM 4-2-12

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4-2-12. Time

a. FAA uses Coordinated Universal Time (UTC) for all operations. The word "local" or the time zone equivalent shall be used to denote local when local time is given during radio and telephone communications. The term "Zulu" may be used to denote UTC.

EXAMPLE-
0920 UTC zero niner two zero,
zero one two zero pacific or local,
or one twenty AM

b. To convert from Standard Time to Coordinated Universal Time:

TBL 4-2-3 Standard Time to Coordinated Universal Time
Eastern Standard Time ............ Add 5 hours
Central Standard Time ............. Add 6 hours
Mountain Standard Time .......... Add 7 hours
Pacific Standard Time .............. Add 8 hours
Alaska Standard Time .............. Add 9 hours
Hawaii Standard Time .............. Add 10 hours

NOTE-
For daylight time, subtract 1 hour.

c. A reference may be made to local daylight or standard time utilizing the 24-hour clock system. The hour is indicated by the first two figures and the minutes by the last two figures.

EXAMPLE-
0000 zero zero zero zero
0920 zero niner two zero

d. Time may be stated in minutes only (two figures) in radiotelephone communications when no misunderstanding is likely to occur.

e. Current time in use at a station is stated in the nearest quarter minute in order that pilots may use this information for time checks. Fractions of a quarter minute less than 8 seconds are stated as the preceding quarter minute; fractions of a quarter minute of 8 seconds or more are stated as the succeeding quarter minute.

EXAMPLE-
0929:05 time, zero niner two niner
0929:10 time, zero niner two niner and one-quarter

Aeronautical Information Manual (AIM) — Chapter 4 — Air Traffic Control
4-1-1 ARTCCs • 4-1-2 Towers • 4-1-3 FSS's • 4-1-4 Recording • 4-1-5 Release of IFR Aircraft • 4-1-6 Visits to Air Traffic Facilities • 4-1-7 Operation Take-off and Operation Raincheck • 4-1-8 Approach Control Service for VFR Aircraft • 4-1-9 Airports Without Operating Control Towers • 4-1-10. IFR Approaches/Ground Vehicle Ops • 4-1-11 UNICOM/MULTICOM Freqs • 4-1-12 UNICOM for ATC • 4-1-13 ATIS • 4-1-14 AFIS • 4-1-15 RADAR Traffic Service • 4-1-16 Safety Alert • 4-1-17 Radar Assistance to VFR Aircraft • 4-1-18. VFR Terminal Radar Services • 4-1-19 TEC • 4-1-20 Transponders • 4-1-21 Hazardous Area Reporting • 4-1-22 Airport Reservation Ops • 4-1-23 Requests for Waivers • 4-1-24 Weather Processor
4-2-1 General • 4-2-2 Radio Technique • 4-2-3 Contact Procedures • 4-2-4 Call Signs • 4-2-5 Leased Aircraft • 4-2-6. Ground Call Signs • 4-2-7 Phonetic Alphabet • 4-2-8 Figures • 4-2-9 Altitudes • 4-2-10 Directions • 4-2-11 Speeds • 4-2-12 Time • 4-2-13 Radio Inop Comm. • 4-2-14 VFR Comm.
4-3-1 General • 4-3-2 Towered Airports • 4-3-3 Traffic Patterns • 4-3-4 Visual Indicators at Untowered Airports • 4-3-5 Unexpected Maneuvers • 4-3-6. Use of Runways • 4-3-7 LLWS/Microbursts • 4-3-8 Braking Reports • 4-3-9 Runway Friction • 4-3-10 Intersection Takeoffs • 4-3-11 LAHSO • 4-3-12 Low Approach • 4-3-13 Light Signals • 4-3-14 Comms. • 4-3-15 Departure Delays • 4-3-16 VFR Flights • 4-3-17 VFR Helicopter Ops • 4-3-18 Taxiing • 4-3-19 Low Vis. Taxi • 4-3-20 Exiting the Runway • 4-3-21 Practice Approaches • 4-3-22 Option Approach • 4-3-23 Aircraft Lights • 4-3-24 Flight Inspection/`Flight Check' Aircraft in Terminal Areas • 4-3-25 Hand Signals • 4-3-26 Uncontrolled Airports With ASOS/AWOS
4-4-1 Clearance • 4-4-2 Clearance Prefix • 4-4-3 Clearance Items • 4-4-4 Amended Clearances • 4-4-5 CDR • 4-4-6 Special VFR • 4-4-7 Pilot Responsibility • 4-4-8 VFR-on-top • 4-4-9 VFR/IFR • 4-4-10 Adherence to Clearance • 4-4-11 IFR Separation • 4-4-12 Speed Adjustments • 4-4-13 Runway Separation • 4-4-14 Visual Separation • 4-4-15 Visual Clearing Procedures • 4-4-16 TCAS I & II • 4-4-17 TIS
4-5-1 Radar • 4-5-2 ATCRBS • AIM 4-5-34-5-3 Surveillance Radar • 4-5-4 PAR • 4-5-5 ASDE-X • 4-5-6 TIS • 4-5-7 ADS-B • 4-5-8 TIS-B • 4-5-9 FIS-B • 4-5-10 ADS-R
4-6-1 RVSM Mandate • 4-6-2 • Flight Levels • 4-6-3 Operator Approval • 4-6-4 Flight Planning into RVSM • 4-6-5 Pilot RVSM • 4-6-6 MWA • 4-6-7 Wake Turbulence • 4-6-8 Pilot/Controller Phraseology • 4-6-9 Contingency Actions • 4-6-10 Accommodation of Non-RVSM • 4-6-11 Climb/Descent to/from Flight Levels Above RVSM