Time Particle 에: Meaning, Rules and Examples

The time particle 에 is the Korean marker that attaches to a time noun to show when something happens: a clock hour, a weekday, a month, a year or a season. Say 세 시에 만나요 for "We meet at three o'clock." Relative words such as 어제 (yesterday) and 오늘 (today) take no particle.

What you'll learn

• Attach 에 to clock times, weekdays, months, seasons and parts of the day.
• Decide whether a time word takes 에 by checking whether it is a fixed point or a word that depends on today.
• Say how often something happens with a pattern such as 하루에 두 번.
• Diagnose the error in 어제에 영화를 봤어요 and fix it.

Before you start: you know the location use of 에, covered in the lesson on the location particle 에, and you can count from one to ten in native Korean numbers. Estimated time: 15 minutes.

What Does the Time Particle 에 Mean?

The time particle 에 means "at", "on" or "in" when it follows a word for a moment in time. It tells the listener when the event happens. A particle (조사, josa) is a short ending glued to a word to show its job in the sentence, like a label on a box. English picks a different small word for each kind of time: "at three", "on Sunday", "in March". Korean uses the single particle 에 for all of them.

The particle is the same 에 that marks places. In both uses it marks a fixed point that the sentence is anchored to. A school is a point in space, and three o'clock is a point in time. Seeing the two uses as one idea makes the particle easier to remember.

A First Example

The two sentences below put 에 on two kinds of time word. Read the Korean first, then the romanization, then the meaning.

• 세 시에 만나요. (se sie mannayo) [세 시에 만나요] = "We meet at three o'clock." Word by word: 세 시 (three o'clock) + 에 (at) + 만나요 (meet).

• 일요일에 쉬어요. (iryoire swieoyo) [이료이레 쉬어요] = "I rest on Sunday." Word by word: 일요일 (Sunday) + 에 (on) + 쉬어요 (rest).

Notice two things. First, the hour uses a native Korean number (세 = three) followed by 시 (o'clock), while minutes use Sino-Korean numbers, as in 세 시 삼십 분 (three thirty). Second, the final ㄹ of 일요일 slides onto 에, so the phrase sounds like [이료이레]. This sound change is called liaison (연음, yeoneum). The spelling stays 일요일에. With the meaning in place, the next question is which time words take the particle.

How Does the Time Particle 에 Work?

The time particle 에 has one form, and it goes on names of fixed points on a clock or calendar. It never changes after a vowel or a consonant. What matters is the type of time word, not its final sound.

1. Pick a time word that names a fixed point: 세 시, 일요일, 3월, 여름, 아침.
2. Attach 에 directly to it, with no space: 세 시에.
3. Add a verb. The verb can be any action or state, because the time particle works with all verbs.
4. Put the verb last.

Pattern Table

The table lists common time words that take 에. Brackets show how the phrase sounds where the sound differs from the spelling.

The table shows that 에 does not care about the size of the time. It works on an hour, a day, a month or a year in the same way. In the "Clock time" row, the phrase 일곱 시 삼십 분 puts a native number on the hour and Sino-Korean numbers on the minutes.

Which Time Words Take No 에?

Words that are defined by today, rather than by the clock or the calendar, take no particle. These words already say when the event happens, relative to the moment of speaking.

A few time words sit in the middle. Year words such as 작년 (last year) and 내년 (next year) commonly take 에, and 올해 (this year) is usually used without it. Week words such as 지난주 (last week), 이번 주 (this week) and 다음 주 (next week) usually take 에. When a word feels uncertain, listen to how native speakers say it and copy them.

Putting a Date and a Time in One Sentence

Put the time words in order from the largest unit to the smallest and attach 에 only once, at the end. The sentence 다음 주 월요일 오후 세 시에 만나요 (daeum ju woryoil ohu se sie mannayo) means "We meet next Monday at three in the afternoon." Adding 에 after every word, as in 월요일에 오후에 세 시에, sounds stiff and wrong. The chain acts as one time phrase, and the particle closes it.

Asking When Something Happens

Ask 몇 시에 만나요? (myeot sie mannayo) [멷씨에 만나요] for "At what time do we meet?" The question word 몇 (how many) plus 시 (o'clock) names a clock hour, so it takes 에. The question word 언제 (when) behaves like 오늘 and takes no particle: 언제 만나요? means "When do we meet?" The form rules are complete, so the next section builds one sentence from scratch.

Worked Example, Step by Step

This worked example builds 세 시에 만나요 ("We meet at three o'clock") from its parts. Each step names one decision, so you can repeat the process with any time.

1. Choose the time. You want to fix a meeting at three o'clock.
2. Build the time noun. The hour takes a native number: 세 (three, the form of 셋 before a counter). Add 시 (o'clock): 세 시.
3. Check whether the word is a fixed point. Three o'clock is a clock point, not a word such as 오늘 or 지금. It takes 에.
4. Attach 에. Write 세 시 and add 에 directly: 세 시에. A space belongs between 세 and 시, but none before 에.
5. Choose the verb. You want "meet", which is 만나다. The polite present is 만나요.
6. Put the verb last. Korean ends with the predicate: 세 시에 만나요.
7. Leave out what is obvious. "We" is clear from the context, so no subject is needed.
8. Say it aloud. The phrase is [세 시에 만나요], with no sound change.

You'll know it worked when you can swap the parts and still choose correctly. Replace 세 시 with 일요일 and the verb with 쉬다, and you get 일요일에 쉬어요. Replace the time with 어제 (yesterday) and the sentence changes: 어제 영화를 봤어요 (eoje yeonghwareul bwasseoyo) [어제 영화를 봐써요] has no 에, because 어제 is a relative word. The same steps also handle the frequency pattern, which the next sections compare with its closest neighbours.

How Is 에 (time) Different from Similar Forms?

The time particle 에 marks one point in time, while 부터 and 까지 mark the start and end of a span, and 동안 marks how long something lasts. Four patterns often compete, and the table puts them side by side.

The test is simple. Ask whether you are naming a moment (에), a span with edges (부터 and 까지), a length (동안) or a day counted from today (nothing). The lessons on the 부터 from particle and the 까지 until particle cover the span patterns in full. The comparison is clear, so the next section collects the other jobs of 에 and its limits.

When Do You Use 에, and When Not?

Use the time particle 에 whenever a fixed point on a clock or calendar answers the question "when?". Beyond that core job, the same particle appears in a frequency pattern, and a few cases are optional.

What Is the Frequency Pattern?

A unit of time plus 에 and a count gives frequency. 하루에 두 번 먹어요 (harue du beon meogeoyo) [하루에 두 번 머거요] means "I eat twice a day." The unit 하루 (one day) plus 에 means "per day", and 두 번 (two times) is the count. The same pattern works with other units: 한 달에 한 번 (han dare han beon) [한 다레 한 번] means "once a month", and 일주일에 세 번 means "three times a week". In this pattern 에 means "per", which is why 세 시간에 한 번 means "once every three hours".

The lesson on the 씩 each particle shows how to add "each" to a count.

Cases Where 에 Is Optional or Dropped

• Approximate times. With 쯤 (about), 에 comes after it: 세 시쯤에 만나요 or 세 시쯤 만나요. The lesson on the 쯤 about particle covers both.
• Casual speech. Speakers often drop 에 after a clock time: 세 시 만나요. The dropped form is normal in chat and fast speech, but it is better to keep 에 in writing and in careful speech.
• Contrast. 에 can be followed by 는 or 도 for contrast or addition: 일요일에는 쉬어요 means "On Sundays (unlike other days), I rest."

Cases Where 에 Does Not Fit

• Relative days. Use no particle after 어제, 오늘, 내일, 지금, 언제 and 아까.
• Length of time. Use 동안 for "for three hours": 세 시간 동안 공부해요. The form 세 시간에 공부해요 does not mean "study for three hours".
• Place. When the noun is a place, use the place uses of 에 or 에서. The lesson on location particle 에서 covers actions in a place.

One honest limit: the "fixed point versus relative word" rule is a teaching guide, not a law. Native speakers sometimes add 에 to words like 올해 or 요즘 in writing, and sometimes drop it after 작년. The rule gives the safe default for beginners. With the uses sorted, the next section lists the mistakes that come from mixing them up.

What Mistakes Do Learners Make?

Learners make four common mistakes with the time particle 에. Each one follows the pattern "learners often assume X; actually Y, because Z".

1. Adding 에 to relative days. Learners often assume every time word needs 에 because 일요일에 and 세 시에 do. Actually 어제, 오늘 and 내일 already point to a moment relative to now, so the correct sentence is 오늘 바빠요, not 오늘에 바빠요.
2. Using 에 to mean "for" a length of time. Learners write 두 시간에 일해요 for "I work for two hours". Actually 에 marks a point or a rate, not a length. Use 동안: 두 시간 동안 일해요.
3. Repeating 에 inside a chain of time words. Learners write 월요일에 오후에 세 시에. Actually the whole chain is one time phrase, so the particle goes only at the end: 월요일 오후 세 시에.
4. Using 에서 for time. Learners write 세 시에서 만나요 because they learned 에서 for places. Actually 에서 marks the place where an action happens or the place where it starts, and it does not mark a point in time. Use 세 시에 만나요.

A practical rule of thumb: if the time word could appear on a clock or calendar, add 에. If the word means "today" in some form, leave it bare. The practice below checks both halves of that rule.

Practice and Answers

These four exercises check the core outcome: using 에 correctly with time words in a new sentence and explaining why. Try each one before reading the answers.

Exercise 1: Choose with or without. Decide whether the blank needs 에 or nothing: 어제__ 영화를 봤어요. (I watched a movie yesterday.)

Exercise 2: Fix the error. A learner writes 오늘에 바빠요 for "I am busy today". Correct it.

Exercise 3: Translate. "I get up at seven." (get up = 일어나다, polite present 일어나요; seven o'clock = 일곱 시)

Exercise 4: Write your own. Write one sentence about what you do on Saturday morning (Saturday = 토요일, morning = 아침).

Answer Key

• Exercise 1: No particle: 어제 영화를 봤어요. 어제 is a relative word, so it stays bare.
• Exercise 2: 오늘 바빠요. (oneul bappayo) Remove 에, because 오늘 is relative to now.
• Exercise 3: 일곱 시에 일어나요. (ilgop sie ireonayo) [일곱씨에 이러나요] The hour is a fixed point on the clock, so it takes 에.
• Exercise 4: One model answer: 토요일 아침에 운동해요. (toyoil achime undonghaeyo) = "I exercise on Saturday morning." The time chain 토요일 아침 takes a single 에 at the end.

If you missed Exercise 1 or 2, reread the table of words that take no 에. The next section shows where to go from here.

Next Lessons and Where to Go from Here

The next lesson in this set is the location particle 에서, which marks the place where an action happens. For the span patterns that sit beside the time particle, read the 부터 from particle and the 까지 until particle. To revisit the place use of the same particle, return to the location particle 에.

What this lesson does not cover. This lesson does not cover time expressions with verb endings such as -(으)ㄹ 때 (when), the full number systems for dates, or the particle 에 with causes. Every lesson in this particle set is listed on korean location particles.

In short, the time particle 에 marks a fixed point on the clock or calendar: attach it to hours, weekdays, months and seasons, leave it off words such as 어제 and 오늘, and use it with a unit of time to say how often something happens.

Frequently Asked Questions

What does 에 mean with a time word? With a time word, 에 means "at" or "on". It marks a point in time, as in 세 시에 (at three o'clock), 일요일에 (on Sunday), 3월에 (in March) and 여름에 (in summer). English changes the small word between "at", "on" and "in", but Korean uses the single particle 에 for all of them.

Why can't I say 어제에 or 오늘에? Words such as 어제, 오늘, 내일 and 지금 already point to a moment relative to now, so Korean does not mark them with 에, and the question word 언제 works the same way. Say 어제 영화를 봤어요, not 어제에 영화를 봤어요. A useful rule is that 에 goes on names of fixed points on a clock or calendar, not on words that depend on today.

How do I say a full date and time with one 에? Chain the time words from large to small and put 에 only once, at the end: 다음 주 월요일 오후 세 시에 만나요 means "We meet next Monday at three in the afternoon." Adding 에 after each word, as in 월요일에 오후에 세 시에, sounds stiff and wrong in everyday speech.

Is 에 the same particle as the location 에? Yes, it is the same particle with the same spelling. Both uses mark a fixed point, one in space and one in time. Dictionaries list the uses separately, but learners can treat them as one idea. Only the nouns change: 학교에 가요 uses a place, and 세 시에 가요 uses a time.

Do I use 에 in speech, writing or both? Both. The time particle appears in casual conversation, polite speech and formal writing, and it does not change with politeness. In fast casual talk speakers sometimes drop it after a clock time, as in 세 시 만나요, but careful speech and writing keep it. Beginners should keep 에 until they hear the dropped form often.