月日|がっぴgappi[0]heiban (flat)

1. nounmonth and day (of the year); (the) date

• Synonym日付ひづけNeutralThe date written on a letter or document, usually including the year; 「月日」 is just the month-and-day combination itself.
• Synonym時日じじつWrittenWritten/formal prose for a date or a date and time; 「月日」 centers on month and day.
• Synonym日にちNeutralA suffix for the nth day of the month or for Sunday; 「月日」 is the pair of month and date.
• Related日取りひどりNeutralThe settled date for a planned event, such as a wedding; 「月日」 centers on the month and day themselves.
• Related日にちひにちNeutralCovers days and the number of days; 「月日」 centers on the month-and-date combination.

Use 「月日」 for the combination of month and day, as in 「生年月日」. For the date written on a document use 「日付」; for an arranged date use 「日取り」; for days or a count of days use 「日にち」; 「時日」 is formal written prose for date and time.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. （つきひ、がっぴ）暦こよみにおける月つきと日ひ。