A week-based measure of sacred time
Every date,
held in one rhythm.
Move freely between Sacred, Hebrew, Gregorian, and Muslim calendars—while preserving the uninterrupted seven-day week.
13equal months
×28days each
=364days per year
01 — Converter
Translate a date
Choose any calendar as your starting point and any other as the destination.
From
Wednesday · fixed day 739,826
ToConverted date
Year 5805 · Month 9 · Day 24
Gregorian dates use the proleptic civil calendar. Muslim dates use the arithmetic tabular calendar; local observation may vary by a day.
02 — Rotating cycle
A long arc back toward alignment.
A Sacred year is exactly 364 days. 293 Sacred years nearly equal 292 mean Hebrew years—a difference of about 1 hour 44 minutes. This realigns year boundaries, not weekdays.
Current Sacred dateY5805 · M9 · D24
81% through this 293-year rotation
Rotation anniversaries 1–20
When the long count turns
Each anniversary marks another complete 293-Sacred-year interval from the Creation-week anchor.
To the 20th anniversary55 Sacred years
117 days remain after those full years
Current Sacred date
ISC 1 · 1 · 1ISC 5805 · 9 · 24#20 · ISC 5861 · 1 · 1
| Milestone | International Sacred | Hebrew | Gregorian | Muslim | Weekday |
|---|---|---|---|---|---|
| Year 294 · Month 1 · Day 1 | 13 Elul 293 AM | August 24, 3468 BCE | 10 Sha'ban 4215 BH | Monday | |
| Year 587 · Month 1 · Day 1 | 1 Tishrei 586 AM | August 25, 3176 BCE | 27 Rajab 3914 BH | Monday | |
| Year 880 · Month 1 · Day 1 | 18 Elul 877 AM | August 27, 2884 BCE | 15 Rajab 3613 BH | Monday | |
| Year 1173 · Month 1 · Day 1 | 5 Tishrei 1170 AM | August 28, 2592 BCE | 2 Rajab 3312 BH | Monday | |
| Year 1466 · Month 1 · Day 1 | 22 Elul 1461 AM | August 29, 2300 BCE | 19 Jumada II 3011 BH | Monday | |
| Year 1759 · Month 1 · Day 1 | 10 Tishrei 1754 AM | August 30, 2008 BCE | 7 Jumada II 2710 BH | Monday | |
| Year 2052 · Month 1 · Day 1 | 27 Elul 2045 AM | August 31, 1716 BCE | 24 Jumada I 2409 BH | Monday | |
| Year 2345 · Month 1 · Day 1 | 13 Elul 2337 AM | September 1, 1424 BCE | 12 Jumada I 2108 BH | Monday | |
| Year 2638 · Month 1 · Day 1 | 1 Tishrei 2630 AM | September 2, 1132 BCE | 29 Rabi II 1807 BH | Monday | |
| Year 2931 · Month 1 · Day 1 | 18 Elul 2921 AM | September 4, 840 BCE | 16 Rabi II 1506 BH | Monday | |
| Year 3224 · Month 1 · Day 1 | 7 Tishrei 3214 AM | September 5, 548 BCE | 4 Rabi II 1205 BH | Monday | |
| Year 3517 · Month 1 · Day 1 | 23 Elul 3505 AM | September 6, 256 BCE | 21 Rabi I 904 BH | Monday | |
| Year 3810 · Month 1 · Day 1 | 10 Tishrei 3798 AM | September 7, 37 CE | 9 Rabi I 603 BH | Monday | |
| Year 4103 · Month 1 · Day 1 | 27 Elul 4089 AM | September 9, 329 CE | 26 Safar 302 BH | Monday | |
| Year 4396 · Month 1 · Day 1 | 15 Elul 4381 AM | September 10, 621 CE | 13 Safar 1 BH | Monday | |
| Year 4689 · Month 1 · Day 1 | 3 Tishrei 4674 AM | September 11, 913 CE | 1 Safar 301 AH | Monday | |
| Year 4982 · Month 1 · Day 1 | 20 Elul 4965 AM | September 12, 1205 CE | 19 Muharram 602 AH | Monday | |
| Year 5275 · Month 1 · Day 1 | 8 Tishrei 5258 AM | September 13, 1497 CE | 6 Muharram 903 AH | Monday | |
| Year 5568 · Month 1 · Day 1 | 23 Elul 5549 AM | September 14, 1789 CE | 23 Dhu al-Hijjah 1203 AH | Monday | |
| Year 5861 · Month 1 · Day 1 | 11 Elul 5841 AM | September 15, 2081 CE | 11 Dhu al-Hijjah 1504 AH | Monday |
03 — Calendar grid
A month you can see
Browse International Sacred months and see both 293-year anniversaries and approximate lunar alignments directly on the grid.
Quick find
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Selected dateToday
25
26
27
28
28 ↔ 29.530588853
Five past and five future lunar alignments
A 28-day month boundary and the mean new moon return near one another about every 540 days, or 1.48 years.
540.2Day · ≈ 1.48 Year
Mean-phase estimate; true astronomical new moons vary and can occur hours away from this model.PastISC 5799 · 4 · 1
GregorianFebruary 24, 2020 CE
Hebrew / Muslim29 Shevat 5780 AM · 29 Jumada II 1441 AH
Mean-moon offset+3.0 h
PastISC 5800 · 10 · 1
GregorianAugust 9, 2021 CE
Hebrew / Muslim1 Elul 5781 AM · 30 Dhu al-Hijjah 1442 AH
Mean-moon offset+13.8 h
PastISC 5802 · 4 · 1
GregorianFebruary 20, 2023 CE
Hebrew / Muslim29 Shevat 5783 AM · 29 Rajab 1444 AH
Mean-moon offset-12.2 h
PastISC 5803 · 10 · 1
GregorianAugust 5, 2024 CE
Hebrew / Muslim1 Av 5784 AM · 29 Muharram 1446 AH
Mean-moon offset-1.4 h
PastISC 5805 · 3 · 1
GregorianJanuary 19, 2026 CE
Hebrew / Muslim1 Shevat 5786 AM · 30 Rajab 1447 AH
Mean-moon offset+9.4 h
FutureISC 5806 · 10 · 1
GregorianAugust 2, 2027 CE
Hebrew / Muslim28 Tammuz 5787 AM · 28 Safar 1449 AH
Mean-moon offset-16.6 h
FutureISC 5808 · 3 · 1
GregorianJanuary 15, 2029 CE
Hebrew / Muslim28 Tevet 5789 AM · 29 Sha'ban 1450 AH
Mean-moon offset-5.8 h
FutureISC 5809 · 9 · 1
GregorianJuly 1, 2030 CE
Hebrew / Muslim30 Sivan 5790 AM · 29 Safar 1452 AH
Mean-moon offset+5.0 h
FutureISC 5811 · 2 · 1
GregorianDecember 15, 2031 CE
Hebrew / Muslim30 Kislev 5792 AM · 1 Ramadan 1453 AH
Mean-moon offset+15.8 h
FutureISC 5812 · 9 · 1
GregorianJune 27, 2033 CE
Hebrew / Muslim30 Sivan 5793 AM · 29 Rabi I 1455 AH
Mean-moon offset-10.2 h
04 — The definition
Simple structure. Continuous week.
Thirteen equal months
Each month is four complete weeks. The same date always lands on the same weekday.
12345678910111213141516171819202122232425262728
Fifty-two full weeks
No leap day or extra day sits outside the seven-day cycle.
13 × 4 = 52
Creation-week anchor
Sacred 1 · 1 · 1 is fixed to Hebrew 25 Elul AM 1. The calculated weekday is preserved rather than forced to Sunday. Monday
Sunday ↔ MondaySunday is the traditional weekday for the first day of Creation. Monday is the result of extrapolating the modern fixed Hebrew calendar’s arithmetic rules back to 25 Elul AM 1. ISC uses Monday for conversion consistency; it does not claim that Jewish tradition assigns Creation to Monday.
“Time can follow meaning as well as the heavens.”
A fourth calendar: not solar, lunar, or lunisolar, but week-based.