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Julian Date Calendar

Convert calendar date into Julian date and vice versa. Input a date and time or a Julian day number to get corresponding conversion.

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📅 Julian Date

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Calendar Date to Julian Date

Julian Date to Calendar Date

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Today's Julian Date Converter:

This Julian Date Calendar converts dates to Julian day (day-of-year) format and converts Julian dates back into standard calendar dates. It is designed for quick date tracking, reference, and accurate date conversions used in fields like data processing, logistics, manufacturing, and astronomy.

What is Julian's Date?

Julian Date (JD) is a continuous count of days used primarily in astronomy and related scientific fields. It represents the number of days and fractional days that have elapsed since noon Universal Time on January 1, 4713 BCE (in the proleptic Julian calendar).

The Julian Date system is used to simplify time calculations in astronomy, space science, and data analysis by providing a single continuous time scale.

The Julian Calendar, introduced by Julius Caesar in 46 BCE, was a reform of the Roman calendar. It consists of 12 months and uses a solar year with a leap year every four years. It was later replaced by the Gregorian calendar in 1582 to better align the calendar with the Earth’s orbit around the Sun and seasonal events like equinoxes and solstices.

How to Calculate Julian’s Date?

A Julian calendar converter translates a Gregorian calendar date (like today's date) into a Julian day today, a continuous count of days since a specific historical date.

To calculate the Julian date assume today's date as November 08, 2024, at 00:00 (midnight).

Break Down the Date:

Year (Y) = 2024
Month (M) = 11 (November)
Day (D) = 8

Calculate the B Term:

For the year 2024:

B = 2024/400 - 2024/100 + 2024/4

B = [5.06] − [20.24] + [506]

B = 5 − 20 + 506 = 491

Apply the Julian Date Formula:

JD = [365.25 × (2024 + 4716)] + [30.6001 × (11 + 1)] + 8 + 491 − 1524.5

2460810 + 367.2012 + 8 = 2460185.2012

Adding B = 491

2460185.2012 + 491 = 2460676.2012

Subtracting 1524.5:

2460676.2012 − 1524.5 = 2460293.5

Final Julian Date:

The Julian Date for November 8, 2024, at 00:00 (midnight) is 2460293.5.

Julian Date Calendar

Unlike the Gregorian calendar, which is more commonly used today, the Julian calendar follows a slightly different set of leap year rules. It has a more straightforward structure for certain historical or scientific purposes.

Julian Date Calendar (For Perpetual Year)

DAY	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1	1	32	60	91	121	152	182	213	244	274	305	335
2	2	33	61	92	122	153	183	214	245	275	306	336
3	3	34	62	93	123	154	184	215	246	276	307	337
4	4	35	63	94	124	155	185	216	247	277	308	338
5	5	36	64	95	125	156	186	217	248	278	309	339
6	6	37	65	96	126	157	187	218	249	279	310	340
7	7	38	66	97	127	158	188	219	250	280	311	341
8	8	39	67	98	128	159	189	220	251	281	312	342
9	9	40	68	99	129	160	190	221	252	282	313	343
10	10	41	69	100	130	161	191	222	253	283	314	344
11	11	42	70	101	131	162	192	223	254	284	315	345
12	12	43	71	102	132	163	191	224	255	285	316	346
13	13	44	72	103	133	164	194	225	256	286	317	347
14	14	45	73	104	134	165	195	226	257	287	318	348
31	31		90		151		212	242		304		365

Julian Date Calendar (For Leap Year)

DAY	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1	1	32	60	91	121	152	182	213	244	274	305	335
2	2	33	61	92	122	153	183	214	245	275	306	336
3	3	34	62	93	123	154	184	215	246	276	307	337
4	4	35	63	94	124	155	185	216	247	277	308	338
5	5	36	64	95	125	156	186	217	248	278	309	339
6	6	37	65	96	126	157	187	218	249	279	310	340
7	7	38	66	97	127	158	188	219	250	280	311	341
8	8	39	67	98	128	159	189	220	251	281	312	342
9	9	40	68	99	129	160	190	221	252	282	313	343
10	10	41	69	100	130	161	191	222	253	283	314	344

FAQs:

What is today's Julian date?

Today's date is . The Julian Date for today is .

Is the Julian date same as the Gregorian?

No. Gregorian is the standard calendar system, while Julian date is the day-of-year number used for counting days.

How do I read a Julian date?

Read it as the sequential day of the year. For example, 045 = the 45th day of the year.

What is 001 in Julian date?

It represents January 1st (the first day of the year).

What is the Julian date today rule?

The Julian date rule represents the date as a combination of the year and the day of the year. The first four digits indicate the year, and the three digits following represent the day number within that year.

How to represent Julian's date?

Julian dates are typically shown as a continuous number combining the year and day-of-year.

Example:

01 January 2010 → 2010001
31 December 2010 → 2010365

Who introduced the Julian calendar?

Julius Caesar

He introduced the Julian date calendar to replace the Roman lunar calendar, creating a more accurate solar calendar system.

References:

Converting Between Julian Dates and Gregorian Calendar Dates, Astronomical Applications Department of the U.S. Naval Observatory.
Julian Day, John Cirillo, KDE Documentation.

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DAY	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1	1	32	60	91	121	152	182	213	244	274	305	335
2	2	33	61	92	122	153	183	214	245	275	306	336
3	3	34	62	93	123	154	184	215	246	276	307	337
4	4	35	63	94	124	155	185	216	247	277	308	338
5	5	36	64	95	125	156	186	217	248	278	309	339
6	6	37	65	96	126	157	187	218	249	279	310	340
7	7	38	66	97	127	158	188	219	250	280	311	341
8	8	39	67	98	128	159	189	220	251	281	312	342
9	9	40	68	99	129	160	190	221	252	282	313	343
10	10	41	69	100	130	161	191	222	253	283	314	344
11	11	42	70	101	131	162	192	223	254	284	315	345
12	12	43	71	102	132	163	191	224	255	285	316	346
13	13	44	72	103	133	164	194	225	256	286	317	347
14	14	45	73	104	134	165	195	226	257	287	318	348
31	31		90		151		212	242		304		365

DAY	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1	1	32	60	91	121	152	182	213	244	274	305	335
2	2	33	61	92	122	153	183	214	245	275	306	336
3	3	34	62	93	123	154	184	215	246	276	307	337
4	4	35	63	94	124	155	185	216	247	277	308	338
5	5	36	64	95	125	156	186	217	248	278	309	339
6	6	37	65	96	126	157	187	218	249	279	310	340
7	7	38	66	97	127	158	188	219	250	280	311	341
8	8	39	67	98	128	159	189	220	251	281	312	342
9	9	40	68	99	129	160	190	221	252	282	313	343
10	10	41	69	100	130	161	191	222	253	283	314	344

DAY	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1	1	32	60	91	121	152	182	213	244	274	305	335
2	2	33	61	92	122	153	183	214	245	275	306	336
3	3	34	62	93	123	154	184	215	246	276	307	337
4	4	35	63	94	124	155	185	216	247	277	308	338
5	5	36	64	95	125	156	186	217	248	278	309	339
6	6	37	65	96	126	157	187	218	249	279	310	340
7	7	38	66	97	127	158	188	219	250	280	311	341
8	8	39	67	98	128	159	189	220	251	281	312	342
9	9	40	68	99	129	160	190	221	252	282	313	343
10	10	41	69	100	130	161	191	222	253	283	314	344
11	11	42	70	101	131	162	192	223	254	284	315	345
12	12	43	71	102	132	163	191	224	255	285	316	346
13	13	44	72	103	133	164	194	225	256	286	317	347
14	14	45	73	104	134	165	195	226	257	287	318	348
31	31		90		151		212	242		304		365

DAY	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1	1	32	60	91	121	152	182	213	244	274	305	335
2	2	33	61	92	122	153	183	214	245	275	306	336
3	3	34	62	93	123	154	184	215	246	276	307	337
4	4	35	63	94	124	155	185	216	247	277	308	338
5	5	36	64	95	125	156	186	217	248	278	309	339
6	6	37	65	96	126	157	187	218	249	279	310	340
7	7	38	66	97	127	158	188	219	250	280	311	341
8	8	39	67	98	128	159	189	220	251	281	312	342
9	9	40	68	99	129	160	190	221	252	282	313	343
10	10	41	69	100	130	161	191	222	253	283	314	344

DAY	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1	1	32	60	91	121	152	182	213	244	274	305	335
2	2	33	61	92	122	153	183	214	245	275	306	336
3	3	34	62	93	123	154	184	215	246	276	307	337
4	4	35	63	94	124	155	185	216	247	277	308	338
5	5	36	64	95	125	156	186	217	248	278	309	339
6	6	37	65	96	126	157	187	218	249	279	310	340
7	7	38	66	97	127	158	188	219	250	280	311	341
8	8	39	67	98	128	159	189	220	251	281	312	342
9	9	40	68	99	129	160	190	221	252	282	313	343
10	10	41	69	100	130	161	191	222	253	283	314	344
11	11	42	70	101	131	162	192	223	254	284	315	345
12	12	43	71	102	132	163	191	224	255	285	316	346
13	13	44	72	103	133	164	194	225	256	286	317	347
14	14	45	73	104	134	165	195	226	257	287	318	348
31	31		90		151		212	242		304		365

DAY	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1	1	32	60	91	121	152	182	213	244	274	305	335
2	2	33	61	92	122	153	183	214	245	275	306	336
3	3	34	62	93	123	154	184	215	246	276	307	337
4	4	35	63	94	124	155	185	216	247	277	308	338
5	5	36	64	95	125	156	186	217	248	278	309	339
6	6	37	65	96	126	157	187	218	249	279	310	340
7	7	38	66	97	127	158	188	219	250	280	311	341
8	8	39	67	98	128	159	189	220	251	281	312	342
9	9	40	68	99	129	160	190	221	252	282	313	343
10	10	41	69	100	130	161	191	222	253	283	314	344