Time Format Converter

How to use

1. 1Pick a mode at the top: 12-hour to 24-hour for a single AM/PM value, 24-hour to 12-hour to invert, or Batch to convert a pasted column.
2. 2Choose the output detail: HH:MM is the schedule default, HH:MM:SS adds seconds for logs or precise timing.
3. 3Type a single time like 1:30 PM or 13:30, or paste a column of times in the batch input. Results update on every keystroke.
4. 4Read the converted time in the result panel and use Copy summary, or in batch mode use Copy column or Copy as table for a clean spreadsheet paste.
5. 5Use the 24-hour reference chart at the bottom for a quick lookup; click any row to load it back into either single-value converter.

About this tool

Time Format Converter switches a clock entry between the two formats every operating system, scheduling app, and travel itinerary eventually mixes: the 12-hour AM/PM clock used in the US and most consumer apps, and the 24-hour clock (often called military time) used in Europe, in aviation and transit schedules, on log files, and in most database fields. The conversion rules are the published clock-time rules: 12:00 AM is 00:00, 12:00 PM is 12:00, the AM hours from 1:00 through 11:59 map one-to-one to 01:00 through 11:59, and the PM hours from 1:00 through 11:59 map to 13:00 through 23:59 by adding 12 to the hour. Seconds are optional in both directions, so 1:30:45 PM round-trips cleanly with 13:30:45. The single-value modes accept flexible input (9 AM, 12:00 PM, 1:30 PM, 5:45:15 PM in 12-hour; 0, 6:30, 12:00, 13:45, 18:00, 23:59:59 in 24-hour), report both the HH:MM and HH:MM:SS forms, echo the cleaned-up input back, and call out the two edge cases (midnight at 12:00 AM / 00:00 and noon at 12:00 PM / 12:00) that account for most of the search traffic. The batch mode runs the same conversion in either direction across a pasted column of times, ready to paste back into Excel, Google Sheets, or Numbers without reformatting; valid lines convert and invalid lines are flagged so you can fix them in the source. The reference panel ships a full 24-row chart from 00:00 to 23:00 with the matching 12-hour value and the midnight and noon labels, and every row in the chart is a button: click a 24-hour value to load it into the 24-to-12 converter, or click a 12-hour value to load it into the 12-to-24 converter, so the chart doubles as a one-click time lookup. The two explainer panels lay out the four mapping rules, the AM/PM versus 24-hour use cases, and the practical advice that when you sort or filter a mixed-format column, you should convert to 24-hour first because sorting AM/PM text alphabetically gives the wrong order. Everything runs locally in your browser, so the schedules, itineraries, and shift times you paste here never leave your device.

Free to use. Works in your browser. No signup, no login.