Translation guide
Expresses that an action or state continues throughout the entire day. Japanese uses various time expressions, adverbs, and phrases depending on nuance.
To say that something lasts or happens for the whole day, from morning to night.
The most common and natural way to say 'all day'. Used for continuous actions or states.
It rained all day yesterday.
He plays games all day.
Can mean 'all day' in certain contexts, especially with verbs like 過ごす (spend) or when emphasizing the whole day as a unit. Often used with まるまる (entire) for emphasis.
Without context, 一日 simply means 'one day'. To clearly mean 'all day', use 一日中 or add まるまる.
I spent the entire day studying.
'Ichinichijuu' and 'ichinichi' are slightly different.
Formal, often used in written language or official announcements.
We are open all day today.
Describing services, shops, or availability that lasts the whole day.
Emphasizing that something continues without stopping from morning to night.
Sometimes 'all day' can mean 'every day' in phrases like 'I could do this all day'.
Means 'every day'. Use when 'all day' implies a habitual action.
This is not a direct translation of 'all day' but captures the meaning in such contexts.
I could eat this all day.
一日中 (いちにちじゅう) specifically means 'all day long' or 'throughout the day'. 一日 (いちにち) simply means 'one day' or 'a day'. To express 'all day', 一日中 is the safest choice. 一日 can work with modifiers like まるまる (entire) or in set phrases.
Avoid directly translating 'all day' as すべての日 (subete no hi) or 全部の日 (zenbu no hi). These are unnatural. Use the expressions above.
終日無料駐車場あり。
Free parking all day.