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C++ Jewish date header only library

A C++20 jewish date libray in the same style of std::chrono date. As the compilers i tried dont have std::chrono date classes the library currently uses Howard Hinnant's date library.

Example usage:

#include <jewish/date.h>
using namespace jewish::literals;
static_assert(date::year_month_day(5781_y / Tishrei / 1) == date::year(2020) / 9 / 19);
static_assert(5781_y / Tishrei / 1 == jewish::year_month_day(date::year(2020) / 9 / 19));

Calendar example output:

$ ./examples/jcal 5781
+-------------------------------------------------------------------------------------------+
|                                                                                      5781 | 
+----------------------+----------------------+----------------------+----------------------+
|              Tishrei |             Cheshvan |               Kislev |                Tevet | 
+----------------------+----------------------+----------------------+----------------------+
|  S  M  T  W  T  F  S |  S  M  T  W  T  F  S |  S  M  T  W  T  F  S |  S  M  T  W  T  F  S | 
+----------------------+----------------------+----------------------+----------------------+
|                   01 |    01 02 03 04 05 06 |       01 02 03 04 05 |          01 02 03 04 | 
| 02 03 04 05 06 07 08 | 07 08 09 10 11 12 13 | 06 07 08 09 10 11 12 | 05 06 07 08 09 10 11 | 
| 09 10 11 12 13 14 15 | 14 15 16 17 18 19 20 | 13 14 15 16 17 18 19 | 12 13 14 15 16 17 18 | 
| 16 17 18 19 20 21 22 | 21 22 23 24 25 26 27 | 20 21 22 23 24 25 26 | 19 20 21 22 23 24 25 | 
| 23 24 25 26 27 28 29 | 28 29                | 27 28 29             | 26 27 28 29          | 
| 30                   |                      |                      |                      | 
+----------------------+----------------------+----------------------+----------------------+
|                Shvat |                 Adar |                Nisan |                 Iyar | 
+----------------------+----------------------+----------------------+----------------------+
|  S  M  T  W  T  F  S |  S  M  T  W  T  F  S |  S  M  T  W  T  F  S |  S  M  T  W  T  F  S | 
+----------------------+----------------------+----------------------+----------------------+
|             01 02 03 |                   01 | 01 02 03 04 05 06 07 |       01 02 03 04 05 | 
| 04 05 06 07 08 09 10 | 02 03 04 05 06 07 08 | 08 09 10 11 12 13 14 | 06 07 08 09 10 11 12 | 
| 11 12 13 14 15 16 17 | 09 10 11 12 13 14 15 | 15 16 17 18 19 20 21 | 13 14 15 16 17 18 19 | 
| 18 19 20 21 22 23 24 | 16 17 18 19 20 21 22 | 22 23 24 25 26 27 28 | 20 21 22 23 24 25 26 | 
| 25 26 27 28 29 30    | 23 24 25 26 27 28 29 | 29 30                | 27 28 29             | 
|                      |                      |                      |                      | 
+----------------------+----------------------+----------------------+----------------------+
|                Sivan |               Tammuz |                   Av |                 Elul | 
+----------------------+----------------------+----------------------+----------------------+
|  S  M  T  W  T  F  S |  S  M  T  W  T  F  S |  S  M  T  W  T  F  S |  S  M  T  W  T  F  S | 
+----------------------+----------------------+----------------------+----------------------+
|          01 02 03 04 |                01 02 |                   01 |    01 02 03 04 05 06 | 
| 05 06 07 08 09 10 11 | 03 04 05 06 07 08 09 | 02 03 04 05 06 07 08 | 07 08 09 10 11 12 13 | 
| 12 13 14 15 16 17 18 | 10 11 12 13 14 15 16 | 09 10 11 12 13 14 15 | 14 15 16 17 18 19 20 | 
| 19 20 21 22 23 24 25 | 17 18 19 20 21 22 23 | 16 17 18 19 20 21 22 | 21 22 23 24 25 26 27 | 
| 26 27 28 29 30       | 24 25 26 27 28 29    | 23 24 25 26 27 28 29 | 28 29                | 
|                      |                      | 30                   |                      | 
+----------------------+----------------------+----------------------+----------------------+

Notable differences

A jewish year leap year has 13 months. To handle this a few more classes were added.

Dependencies

Howard Hinnant's date library.

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c++20 Jewish Date header only library

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