Dates in January
January Dates in Roman Numerals
January is month 1, so it is written I in a Roman numeral date. Choose a year and day to open the complete Date Page.
Month numeral
IJanuary is month 1Browse January dates
Choose a day in January 2026
Select a year and day, then open the permanent Date Page for that conversion.
Compare formats
January 8, 2026 in different date orders
Each line represents the same date. Only the order of the month, day and year changes.
Understanding the month
What I means in a date
The labels and date order tell you whether I is being used as the month.
I means 1
It represents January only when the surrounding date format identifies it as the month.
Use a clear date format
Keep the ordinary date with the Roman result when it will be printed, engraved or used permanently.
Need to know
Common questions about January dates
How January is written, how many days it has and how to browse another year.
How is January written in Roman numerals?
January is the 1st month, so its month number is written I in Roman numerals.
Does I always mean January?
No. I always represents the number 1. It represents January only when the date order or surrounding label identifies it as the month.
How many days are in January?
January has 31 days in 2026. The calendar above prevents links to impossible dates.
Can I browse January dates in another year?
Yes. Change the year in the calendar. The selection updates the permanent Date Page link without creating another indexable Month Hub URL.