Convert between 12-hour civilian AM/PM time and 24-hour military notation with spoken phonetic pronunciation.
Choose "12-Hour to 24-Hour / Military" or "Military / 24-Hour to 12-Hour".
Input your time (e.g. 5:30 PM or 1730) or click one of the quick preset buttons.
Instantly view standard 12-hour AM/PM, ISO 24-hour time (17:30), military notation (1730), and phonetic tactical pronunciation.
AM Hours: If Hour == 12 -> 00, else Hour | PM Hours: If Hour == 12 -> 12, else Hour + 12 12:00 AM (Midnight) = 0000 in military notation / 00:00 in 24-hour time12:00 PM (Noon) = 1200 in military notation / 12:00 in 24-hour timePM Conversion = Add 12 to hours from 1:00 PM (1300) through 11:59 PM (2359)Military notation omits the colon and always uses four digits (leading zero for single-digit hours).
Step-by-step breakdown of common real-world time scenarios, work shifts, and duration math.
Converting midnight to military notation.
12:00 AM -> Hour 12 AM becomes 00:00 Converting midday noon to military notation.
12:00 PM -> Hour 12 PM remains 12:00 Converting 1:00 PM to military time.
1:00 PM -> 1 + 12 = 13:00 Converting 11:59 PM to military notation.
11:59 PM -> 11 + 12 = 23:59 How professionals and individuals apply this calculation across various industries.
Pilots, air traffic controllers, and dispatchers utilize 24-hour time and UTC Zulu time to coordinate global flight plans.
Nurses and physicians record medication administration and clinical vitals in 24-hour format to prevent AM/PM dosage errors.
Armed forces and tactical units use 4-digit colon-free military notation with phonetic radio pronunciation for clear operations.
European, Asian, and Latin American train and bus timetables are published universally in 24-hour format.
While the terms "military time" and "24-hour time" are often used interchangeably in casual conversation, they are technically distinct standards with different formatting, pronunciation, and operational contexts.
| Characteristic | Military Time (US Armed Forces / NATO) | Standard 24-Hour Time (ISO 8601) | Standard 12-Hour Time |
|---|---|---|---|
| Colon Separator | No Colon (e.g., 1730) | Uses Colon (e.g., 17:30) | Uses Colon (e.g., 5:30 PM) |
| Leading Zeros | Always 4 digits (e.g., 0800) | Typically 2 digits for hour (08:00 or 8:00) | No leading zero (e.g., 8:00 AM) |
| Spoken Pronunciation | "Zero Eight Hundred", "Seventeen Thirty Hours" | "Seventeen Thirty" or "Half past Five" | "Five Thirty PM" |
| Midnight Notation | 0000 (Start of day) / 2400 (End of day) | 00:00 (or 24:00 in ISO 8601) | 12:00 AM |
| Time Zone Suffixes | Military Zone Letters (e.g., 1730Z Zulu / UTC) | ISO Offsets (e.g., 17:30+00:00) | Named Zones (e.g., 5:30 PM EST) |
Learn more about clock conversions in our Time & Military Clock Guide or calculate the exact duration between two military timestamps on our flagship Time Duration Calculator:
9:15 AM = 0915). The only exception is 12:00 AM (Midnight), which becomes 0000.3:45 PM = 3 + 12 = 1545). The only exception is 12:00 PM (Noon), which remains 1200.12:00 AM (midnight) is 0000 in military time ("Zero Hundred Hours"). In some logistics and railway schedules, 2400 is used to denote the exact conclusion of a calendar day.
12:00 PM (noon) is 1200 in military time ("Twelve Hundred Hours").
Standard 24-hour time (ISO 8601) includes a colon (e.g. 14:30) and is used in civil aviation, transportation, and computing. Military time omits the colon (e.g. 1430), always uses 4 digits with leading zeros, and includes phonetic pronunciation in tactical communications.
1:00 PM is 1300 in military time ("Thirteen Hundred Hours") or 13:00 in standard 24-hour time.
11:59 PM is 2359 in military time ("Twenty-Three Fifty-Nine") or 23:59.
All calculations on this tool are deterministic and rigorously tested against base-60 modulo arithmetic and US Fair Labor Standards Act (FLSA 29 CFR § 785.48) payroll rounding guidelines.