Calendar Magic 18.9

Daylight Saving Time (DST) - Added a new menu item (Dates > DST Dates).
For countries using DST in the current year, this menu item will
generate a list of the countries and the DST begin and end dates for
each country. Updated the DST information for Azerbaijan, Belarus,
Chile, Egypt, Greenland, Haiti, Iran, Jordan, Kazakhstan, Kyrgyzstan,
Mexico, Morocco, Palestine Authority, Paraguay, Syria, Turkey and Uruguay.
Worldwide Locations Database - Eight Russian regions (oblasts) have
changed their time zones in 2016. The regions are Astrakhan, Ulyanovsk,
Altai Krai, Altai Republic, Tomsk, Zabaykalsky Krai, Sakhalin and
Magadan. On May 1, Venezuela also changed its time zone from UTC - 4.5
to UTC -4. Calendar Magic's world wide locations database has been
updated to reflect these changes.
Big Numbers Calculator - A new Mersenne prime number has recently been
discovered, the 49th such number, and the Big Numbers Calculator now
supports its evaluation. The new prime has the form 2^74207281 - 1 and
contains over 22 million digits (22338618 to be precise). Expect its
evaluation to take days rather than hours. Also forget any thoughts
about calculating the corresponding perfect number! Made some changes to
the underlying program code to speed up the calculation of the square
roots of very large numbers.
Expression Calculator - Copying and pasting data into the Expression
Calculator has been improved. At the request of a user, added a saved
history file to convert from kilograms to stones, pounds and ounces. UK
citizens of mature years still tend to think of weights in terms of
these older imperial units. An equivalent file has also been provided
for converting in the other direction.
Hindu Religious Festivals - The 2016 to 2018 dates for the Hindu
religious festival Maha Shivaratri were out by one day. All three have
been corrected.

Enlarged Views:
Following a suggestion from a user, the method for displaying enlarged views of text output has been totally redesigned. Now an enlarged view will occupy as much screen "vertical real estate" as possible. For example, on modern screens with diagonal lengths greater than 15.6 inches, a full year calendar should now be completely visible.
The F11 function key continues to be used for toggling between enlarged and normal views.
Reminders:
When Calendar Magic is started up, different short sounds are now used to indicate if there is a reminder set for the current date and, if not, if there is one occurring within the next 7 days. For the former, a short sound is played twice; for the latter, the short sound is played once only.
This feature has been added primarily for the benefit of blind and visually impaired users.
Special Calendars:
Added an option “Swedish and Finnish Calendars for 1700 to 1712” to display the calendars used in Sweden (Finland was part of Sweden at that time) during this period. Remarkably the calendar for 1712 contains 30 days in February.
Factor Calculator:
Any unacceptably long factorisation may now be terminated by the Ctrl+T keyboard key combination rather than having to use the Task Manager to end the process yafu.exe.
Time Zones:
Updated the time zone information for North Korea. On August 15, 2015 it changed from UTC + 9 hours to UTC + 8.5 hours.
Winter Olympics:
Added data for the Beijing Winter Olympics in 2022.
World-wide Locations Database:
At the request of a user, added Gassa Chare, Ethiopia to Calendar Magic’s database of world-wide locations.
Observed Days:
Added Black Friday (4th Friday in November) to the list of Observed Days under “various”.
Translations:
Translated versions of the list of Calendar Magic’s main features are now available in Belarussian, Italian, Polish, Spanish and Thai.

System Tray:
As requested by several users, the main screen of Calendar Magic now minimises to the System Tray by default. There is a new Check Box (Options > General > Minimise to the System Tray) for turning this off, if you prefer to minimise the main screen to the task bar.
Date and Time Converter:
Added a "Date and Time Converter" (Time > What Time is it in? > Date and Time Converter) for converting a date and time from one time zone to another. This can be useful for arranging meetings when several time zones are involved or when participating in eBay auctions. Suggested by a user in New Zealand.
Accented Characters in data:
Some Windows System Locales used in Asian countries trigger errors when Calendar Magic processes data files containing accented characters. These errors should no longer occur with Calendar Magic now switching seamlessly to equivalent data files with all diacritic marks removed.
Planning Calendars:
Added a new type of planning calendar "Calendar with North American Week Numbers".
Expression Calculator:
Added a function solve(f;x) for finding a real root of the user defined function f given a rough guess x of its value. For example, if a user defines the function poly(x) = x^3 + 3*x^2 + 7*x -15, a root near 2 of this function may be calculated by using the input solve(poly;2) to obtain the value 1.229494219409. More detailed information is available in the Expression Calculator section of this document.
The angle measure chosen (degrees or radians) is now a "sticky" value.
Equation Solver:
Altered the last section of output to make it, hopefully, more meaningful and easier to extend in the future to higher order polynomials.
Observed Days:
Added Kalevala's Day (Feb. 28) to the list of Observed Days for Finland.
Added Assumption (Aug. 15) and the Immaculate Conception (Dec. 8) to the list of Observed Days for Malta.
Added World Backup Day (Mar. 31) to the list of Observed Days common to many countries.

List of Reminders - When reminders are listed on the main screen, if two consecutive reminders occur on the same date, you may now reverse the order in which they are listed by left-clicking one of the two reminder messages and then using the Ctrl+UpArrow or Ctrl+DownArrow keyboard key combination as appropriate. Any such change is "sticky". This is useful, for example, for listing two "same date" reminders in the order in which the corresponding events will occur on that day.
Factor Calculator and Prime Calculator - Calendar Magic now auto-detects whether the Windows OS is 32-bit or 64-bit and then uses the appropriate YAFU executable. Before any YAFU based factorisation, old YAFU data and log files are now automatically removed. This helps to ensure more consistent run times when a factorisation is repeated. Updated YAFU from V1.29 to V1.34.
Time Zones and Use of DST - In October, 2014 Russia implemented major changes to its time zones and also abandoned the use of DST in future years. Belarus has also decided to remain on permanent "summer time". These changes have been incorporated in Calendar Magic.
World-wide Locations Database - Added the following Russian cities and towns - Baley, Bodaibo, Chelyuskin, Cherskiy, Druzhina, Dudinka, Evensk, Khapcheranga, Khasan, Khatanga, Mirny, Nikolaevsk-on-Amur, Okha, Othosk, Palana, Pevek, Provideniya, Salekhard, Tiksi, Tura, Turukhansk, Tynda, Udachny, Uelen, Ust-Ordynskiy, Vanavara and Verkhoyansk. At the request of an Ethiopian user, added the town of Gambella to Calendar Magic's database of world-wide locations.
Observed Days - Added Armed Forces Day (last Saturday in June) to the list of observed days for England, Northern Ireland, Scotland and Wales.
Travelling Salesman Problem - Added a data file (Commonwealth capitals.tsp) for the 71 countries and territories sending athletes to the 2014 Commonwealth Games in Glasgow, Scotland.

Calculation of Mersenne Prime Numbers - Added an option "nth Mersenne prime" to the Big Numbers Calculator to calculate the nth Mersenne prime number, where the input n is any integer in the range 1 to 48. Mersenne primes are of the form 2^P - 1, where P is also a prime number, and only 48 Mersenne primes are currently known.
As n increases, the corresponding Mersenne prime increases in size very rapidly. For example, the 30th Mersenne prime contains 39751 digits and the 48th (the largest prime number currently known) contains 17425170 digits. As a result, for values of n above the mid-30s, the calculation times required can run into hours or even days.
Calculation of Perfect Numbers - Added an option "nth perfect number" to the Big Numbers Calculator to calculate the nth perfect number, where the input n is any integer in the range 1 to 48. An integer N is said to be "perfect" if the sum of its proper factors is equal to N. For example, the first two perfect numbers are 6 and 28 with 6 = 1+2+3 and 28 = 1+2+4+7+14. The next two are 496 and 8218.
As n increases, the corresponding perfect number also increases in size very rapidly. For example, the 30th perfect number contains 79502 digits and the 48th (the largest perfect number currently known) contains 34850340 digits. As a result, for values of n above the mid-30s, the calculation times required can run into hours or even days.
Significant Digits in Results - In the Expression Calculator and various other routines in Calendar Magic, the specification of the number of significant digits in results is no longer applied when the result is an exact integer. For example, when 3 is specified as the number of significant digits, calculating 3^3 + 4^4 + 3^3 + 5^5 will now display the correct result 3435 and not 3430.
Thailand Observed Days - Added 2014 information for observed days determined by the local Buddhist lunar calendar.
Time Zone Changes in Brazil - The state of Acre and the western part of the state of Amazonas are now in the (GMT-5) hours time zone.
DST in Israel - As approved by the Israeli Knesset on July 8, 2013, DST in Israel now ends on the last Sunday in October.
Other DST Information - Updated DST information for Brazil, Jordan and Libya. Jordan no longer uses DST and Libya is effectively on permanent DST, making its time zone (GMT + 2) hours.

Using Combo Boxes with Keyboard Keys - Based on input from a blind user,
it is now much easier to use combo boxes with various keyboard keys. When a combo box "has the focus", the up and down arrow keys may be used repeatedly to move up or down through its list of items, selecting each one in turn. Similarly, the Home and End keys may be used to select the first and last items.
System Locales - Made Calendar Magic more resilient on PC systems on which the chosen system locale is unable to handle accented characters with ASCII values greater than 255.
Country BAC Data - Updated the Blood Alcohol Content (BAC) data for various countries.
Thailand Observed Days - Added 2013 information for observed days determined by the local Buddhist lunar calendar.
Parsi Fasli Calendar - Fixed a bug in the calculation of year values.