Julian Date Converter
Convert a calendar date into common Julian date formats, astronomical Julian Date, and Modified Julian Date. Reverse Julian values back to calendar dates, then batch-convert common date lists when you need more than one answer.
Live Reference
26161
Wednesday, June 10, 2026
Use these live values as a quick reference before converting another date, code, or Julian Date value.
Current Snapshot
Common Julian date: 26161. Full ordinal: 2026161. Day of year: 161. JD: 2461202.36011. MJD: 61201.86011.
YYDDD
26161
YYYYDDD
2026161
Day Of Year
161
JD
2461202.36011
MJD
61201.86011
JDN
2461202
Convert A Calendar Date To Julian Formats
Use this section when you start with a normal calendar date. The common Julian codes come from the date itself. The astronomical outputs use the selected time basis so you can work with an exact instant when needed.
Converted Result
Select a date and time to calculate every Julian format.
YYDDD
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YYYYDDD
-
Day Of Year
-
JD
-
MJD
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JDN
-
The common codes reflect the calendar date. The astronomical outputs reflect the selected time basis and clock time.
Convert A Julian Value Back To A Calendar Date
Paste a common Julian code such as YYDDD or YYYYDDD, or enter an astronomical JD or MJD value. If you use a plain day-of-year number such as 161, choose the year that should be applied.
Converted Result
Enter a Julian value to convert it back to a date.
Detected Type
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Calendar Date
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Common YYDDD
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Full YYYYDDD
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For JD and MJD values, the converter also resolves the UTC instant. For DDD-only input, the year field is required.
Batch Convert Common Julian Codes
Convert multiple date-only values at once. This batch section focuses on the common day-of-year style Julian formats, which are the most useful for labels, spreadsheets, production logs, and everyday operational work.
Expected date input is one YYYY-MM-DD value per line. Supported Julian input is one YYDDD, YYYYDDD, or DDD value per line.
Supported Formats
YYDDD: a 5-digit common business code such as 26161.
YYYYDDD: a 7-digit full year code such as 2026161.
DDD: a day-of-year number from 1 to 365 or 366. The year must be provided separately.
JD: the astronomical Julian Date, a continuous count tied to an exact instant.
MJD: Modified Julian Date, equal to JD minus 2400000.5.
When To Use The Calendar Instead
If you want to browse the whole year visually instead of converting one value at a time, open the Julian date calendar.
The calendar page is built for current-year and adjacent-year browsing, while this page is built for exact conversions and batch work.
If you only need the broad answer for today, the main Julian date page is the simpler entry point.