You glance at the clock and wonder how long until 1:20. Maybe it is a meeting, a lunch break, a train, or an alarm you do not want to miss. The answer depends on one thing: what time it is right now.
This guide gives you a fast formula, ready-made countdown charts, and real examples. You will also learn why 1:20 AM and 1:20 PM trip people up, and how to avoid the mistakes that cause late arrivals.
The Quick Answer: How Long Until 1:20?
To find how long until 1:20, subtract the current time from 1:20. At 12:45 PM, there are 35 minutes until 1:20 PM. At 9:00 AM, there are 4 hours and 20 minutes. For speed, convert both times to minutes after midnight: 1:20 AM is 80, and 1:20 PM is 800.
I cannot see your clock, so no article can hand you a live number. Use the charts below, or run the two-step formula and you will have your answer in under ten seconds.
In This Guide
- At-a-glance summary of 1:20 in every common time format
- Three simple methods to calculate the time remaining
- 1:20 AM vs 1:20 PM and how to tell which one you need
- Countdown charts for both versions of 1:20
- Real-life examples, daylight saving notes, common mistakes, and FAQs
1:20 at a Glance
| Version | 12-Hour Clock | 24-Hour / Military | Minutes After Midnight |
|---|---|---|---|
| Early morning | 1:20 AM | 01:20 (0120) | 80 |
| Afternoon | 1:20 PM | 13:20 (1320) | 800 |
| Gap between the two | 12 hours | 12 hours | 720 minutes |
Notice the 12-hour gap. That is why a countdown to the wrong version can be off by half a day.
How to Calculate the Time Until 1:20
You do not need an app. Pick whichever method feels natural.
Method 1: Count in Chunks
This is the mental-math favorite. Count to the next full hour, then add 20 minutes.
- Start with the current time, such as 11:47 AM.
- Count the minutes to the next hour: 13 minutes to 12:00 PM.
- Add the hour from 12:00 to 1:00, which is 60 minutes.
- Add the final 20 minutes. Total: 13 + 60 + 20 = 93 minutes, or 1 hour 33 minutes.
Method 2: The Minutes-After-Midnight Formula
This one never fails, even across noon or midnight.
- Step 1: Turn the current time into minutes after midnight (hours × 60, plus minutes).
- Step 2: Subtract that number from 800 for 1:20 PM, or from 80 for 1:20 AM.
- Step 3: If the result is negative, add 1,440 (the minutes in a day). That means 1:20 is tomorrow.
Example: it is 9:00 AM, which is 540 minutes. Then 800 − 540 = 260 minutes, or 4 hours 20 minutes until 1:20 PM.
Method 3: Let Your Device Do It
Say "set a timer for the next 1:20" to a voice assistant, or create an alarm in your clock app. Online countdown pages also work, as long as you pick the right AM or PM option.
1:20 AM vs 1:20 PM: Which One Do You Mean?
Most people searching this phrase mean whichever 1:20 comes next. Still, the two versions behave very differently in daily life.
| Feature | 1:20 AM | 1:20 PM |
|---|---|---|
| Time of day | Middle of the night | Early afternoon |
| Typical use | Alarms, night shifts, flights, overnight deadlines | Lunch meetings, classes, appointments, school pickups |
| Easy to confuse with | 1:20 PM on a 12-hour clock | 1:20 AM when typing quickly |
| Safest way to write it | 01:20 | 13:20 |
If an invitation just says "1:20," check the surrounding context. A lunch meeting is almost certainly PM. When in doubt, ask or switch to 24-hour time.
Also Read This Blog How Long Until 2:45? Quick Answer, Time Chart & Easy Math
Countdown Charts: Time Left Until 1:20
Counting Down to 1:20 PM
| If the Time Now Is | Time Left | Total Minutes |
|---|---|---|
| 8:00 AM | 5 hr 20 min | 320 |
| 9:00 AM | 4 hr 20 min | 260 |
| 10:00 AM | 3 hr 20 min | 200 |
| 11:00 AM | 2 hr 20 min | 140 |
| 12:00 PM (noon) | 1 hr 20 min | 80 |
| 12:30 PM | 50 min | 50 |
| 12:45 PM | 35 min | 35 |
| 1:00 PM | 20 min | 20 |
| 1:15 PM | 5 min | 5 |
Counting Down to 1:20 AM
| If the Time Now Is | Time Left | Total Minutes |
|---|---|---|
| 9:00 PM | 4 hr 20 min | 260 |
| 10:00 PM | 3 hr 20 min | 200 |
| 11:00 PM | 2 hr 20 min | 140 |
| 12:00 AM (midnight) | 1 hr 20 min | 80 |
| 12:30 AM | 50 min | 50 |
| 1:00 AM | 20 min | 20 |
Every row follows the same rule: the minutes left equal the target in minutes minus the clock in minutes.
Real-Life Examples
These are simple scenarios to show the math at work.
Catching a Train at 1:20 PM
It is 11:47 AM and your train leaves at 1:20 PM. You have 1 hour 33 minutes. Add 30 minutes for travel and ticket checks, and your real deadline to leave is closer to 12:50 PM.
Wrapping Up a Lunch Break
Your break starts at 12:05 PM and you must be back at 1:20 PM. That gives you 1 hour 15 minutes, which is plenty for lunch plus a short walk.
An Overnight Deadline
It is 11:35 PM and a file is due at 1:20 AM. That is 25 minutes to midnight plus 1 hour 20 minutes, so 1 hour 45 minutes total. Here the clock crosses a date line, which is where most mistakes happen.
Time Zones and Daylight Saving: When 1:20 Gets Tricky
A countdown is only correct if both clocks use the same time zone. If a colleague says "1:20 my time," confirm whose time they mean.
Daylight saving can also bend the math in regions that observe it.
| Situation | What Happens | What to Do |
|---|---|---|
| Clocks spring forward (US, typically 2:00 AM) | The hour between 2:00 and 3:00 AM is skipped, so a countdown across it is one hour shorter than it looks | Subtract one hour for any span that crosses the change |
| Clocks fall back (US, typically 2:00 AM) | The 1:00 AM hour happens twice, so 1:20 AM occurs two times that night | Specify "first" or "second" 1:20 AM, or use UTC |
| Different time zones | The same moment has different clock readings | Convert both times to one zone first |
Terms Worth Knowing
| Term | What It Means |
|---|---|
| Elapsed time | The amount of time between a start point and an end point |
| 12-hour clock | A system that repeats 1 to 12 twice daily, labeled AM and PM |
| 24-hour clock | A system that runs from 00:00 to 23:59, with no AM or PM |
| Military time | The 24-hour clock written without a colon, such as 1320 |
| Minutes after midnight | A running count that makes subtraction simple |
| UTC | The global reference time used to compare time zones |
| Countdown timer | A tool that shows hours, minutes, and seconds left to a target |
Also Read This Blog How Long Until 3:40? Easy Countdown Method, Tables & Examples
Common Mistakes and Do's and Don'ts
Mistakes That Cost People Time
- Mixing up AM and PM. This alone can create a 12-hour error.
- Forgetting that an hour has 60 minutes. From 12:50 to 1:20 is 30 minutes, not 70.
- Treating 1:20 as the start of your prep. Plan to be ready earlier.
- Ignoring the date change when counting past midnight.
Do's and Don'ts
| Do | Don't |
|---|---|
| Write the time in 24-hour format when clarity matters | Assume everyone reads "1:20" the same way |
| Count to the next full hour first | Subtract minutes and hours separately in your head |
| Add a buffer for travel, setup, or delays | Plan to finish at exactly 1:20 |
| Confirm the time zone for remote meetings | Trust a countdown you have not checked against your own clock |
Nearby Times for Quick Comparison
Sometimes the real question is how 1:20 compares to another time. Here is a handy reference.
| Time (PM) | Minutes After Midnight | Compared to 1:20 PM | Difference |
|---|---|---|---|
| 1:15 PM | 795 | Earlier | 5 minutes |
| 1:20 PM | 800 | Target | 0 |
| 1:30 PM | 810 | Later | 10 minutes |
| 1:45 PM | 825 | Later | 25 minutes |
| 2:00 PM | 840 | Later | 40 minutes |
Frequently Asked Questions
How many minutes until 1:20 if it is 1:00?
There are 20 minutes. Simply subtract 1:00 from 1:20.
What is 1:20 PM in 24-hour time?
It is 13:20, often spoken as "thirteen twenty." Add 12 to the hour for any PM time after noon.
What is 1:20 AM in military time?
It is 0120, read as "zero one twenty."
What if 1:20 has already passed today?
Your countdown is to tomorrow. Use the formula and add 1,440 minutes if the subtraction gives a negative number.
Why does my answer differ from an online timer?
The usual causes are AM versus PM, a different time zone, or a device clock that is slightly off.
Can I set an alarm for 1:20?
Yes. Any phone clock app lets you set one-time or repeating alarms, so check the AM or PM label before you save it.
Final Thoughts
Working out how long until 1:20 comes down to three habits. Confirm AM or PM, convert to minutes if the math feels messy, and add a buffer so you arrive calm instead of rushed.
Bookmark the charts above and use the next-hour trick whenever you are short on time. Once it clicks, you will answer this question at a glance.
Shoaib Ahmad is an SEO and digital content professional with experience in creating helpful, easy-to-understand online content. At Whizz Aura, he focuses on English grammar, vocabulary, word meanings, sentence structure, and practical language tips. His goal is to make learning English simple, clear, and useful for everyday communication.
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