Date & Time Calculator
12 Hour to 24 Hour Converter
Convert 12-hour AM/PM time into 24-hour time.
Calculator
Results
24-hour time
16:30
12-hour4:30 PM
Hours since midnight990
24-hour16:30
Results are calculated instantly in your browser using the inputs shown. Date and time calculations follow the stated assumptions below.
How it works
Convert 12-hour AM/PM time into 24-hour time.
24-hour hour = (12-hour hour mod 12) + 12 for PM.
Example
| Example | Result |
|---|---|
| 4:30 PM | 16:30. |
Important notes
- Calendar calculations use Gregorian calendar rules.
- Business-day calculations exclude Saturday and Sunday unless stated otherwise.
- Time-zone calculations depend on the browser's IANA time-zone data.
- For planning purposes, verify dates and times when a contractual or legal deadline is involved.
Frequently Asked Questions
What is 12 AM in 24-hour time?
00:00.
What is 12 PM?
12:00.
How to use this calculator
What to enter
Enter or select the following as requested: Hour (1–12); Minutes; AM / PM. Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The output is the equivalent value in the selected target unit or format. Confirm the source and target units, any required context (such as temperature scale or time zone), and the displayed rounding.
When to use it
Use this when the same quantity or value is needed in another compatible unit or representation. For practical measurements, verify the converted value and unit before using it.