Printable calendar
Julian Date Calendar 2020
Look up the Julian date (day-of-year) for any day in 2020. Find the day
of the month down the left, read across to the month, and the cell is the
day of year — for example July 21 is day 203,
written 2020203.
Leap year 366 days Download PDF
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2020 is a leap year — February has 29 days and days from March onward are shifted by one.
Month-by-month day-of-year ranges for 2020
| Month | First day | Last day | Days |
|---|---|---|---|
| January | 001 | 031 | 31 |
| February | 032 | 060 | 29 |
| March | 061 | 091 | 31 |
| April | 092 | 121 | 30 |
| May | 122 | 152 | 31 |
| June | 153 | 182 | 30 |
| July | 183 | 213 | 31 |
| August | 214 | 244 | 31 |
| September | 245 | 274 | 30 |
| October | 275 | 305 | 31 |
| November | 306 | 335 | 30 |
| December | 336 | 366 | 31 |
How to use this Julian date calendar
The three-digit number in each cell is the day of the year.
To build a full Julian date code, put the year in front: in 2020, July 21
is day 203, so the 7-digit code is 2020203
and the 5-digit code is 20203. To go the other way,
find the number in the grid and read off its month and day, or use the
Julian date → calendar converter.
Key day-of-year checkpoints in 2020
These anchor dates make a fast sense-check for a label, spreadsheet or import. The value should match the calendar type shown above; values after February differ between common and leap years.
| Calendar date | Day of year | Full code |
|---|---|---|
| 1 January 2020 | 001 | 2020001 |
| 29 February 2020 | 060 | 2020060 |
| 1 March 2020 | 061 | 2020061 |
| 1 July 2020 | 183 | 2020183 |
| 1 October 2020 | 275 | 2020275 |
| 31 December 2020 | 366 | 2020366 |
When this calendar is the right tool
Use a year-specific chart when the year is known and you need a quick, auditable lookup without relying on a script or formula. It is useful for production logs, inventory rotation, batch documentation and checking a date exported from a legacy system. The grid gives only the ordinal day-of-year value: it is not the astronomical Julian Date used for time-stamped scientific observations.
For a new record, prefer the seven-digit YYYYDDD form. It
keeps the year and three-digit day together, sorts chronologically as text,
and avoids the century ambiguity of a five-digit YYDDD value.
A three-digit value by itself is incomplete unless the year is established
elsewhere in the record.
Leap-year note
2020 is a leap year. February has 29 days, so every date from 1 March onward has a day-of-year one higher than in a common year. Don't reuse a common-year chart for 2020.