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Julians 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's Date Calendar helps to track and manage dates based on the Julian calendar system. This calendar aims to help those who need to work with historical date, astronomy, or any specific field that requires Julian date notation.

What is Julian's Date?

Julian date (abbreviated JD) refers to the specific historical references involving a continuous time system and fraction elapsed since noon Universal time on January 1, 4713 BC. Approximately, 2.5 million days have occurred since this point in time.

In 1582 the Gregorian calendar that is used today, replaced the Julian calendar to improve the alignment of calendar dates with the equinoxes and solstices. Julius Caesar invented the Julian calendar today in 46 B.C. as a reform of the Roman republican calendar. This calendar consists of twelve months based on a solar year.

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 .

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 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