Howard Hinnant
c64d69b1e1
* Use GetDynamicTimeZoneInformation to get .TimeZoneKeyName https://msdn.microsoft.com/en-us/library/windows/desktop/ms724318(v=vs.85).aspx > Retrieves the current time zone and dynamic daylight saving time settings. https://msdn.microsoft.com/en-us/library/windows/desktop/ms724253(v=vs.85).aspx > The name of the time zone registry key on the local computer. * This avoids the need to map from StandardName to TimeZoneKeyName. * Using .DynamicDaylightTimeDisabled = true forces the OS to return a non-daylight saving time result. * Use of wcstombs is preferred over wstring_convert as the latter is now deprecated in C++17 because the implementors could not interpret the specification.
This is actually several separate C++11/C++14 libraries:
-
"date.h"is a header-only library which builds upon<chrono>. It adds some newdurationtypes, and newtime_pointtypes. It also adds "field" types such asyear_month_daywhich is a struct{year, month, day}. And it provides convenient means to convert between the "field" types and thetime_pointtypes. See http://howardhinnant.github.io/date/date.html for more details.Here is the Cppcon 2015 presentation on date.h: https://www.youtube.com/watch?v=tzyGjOm8AKo
Here are the Cppcon 2015 slides on date.h: http://schd.ws/hosted_files/cppcon2015/43/hinnant_dates.pdf
-
"tz.h"/"tz.cpp"are a timezone library built on top of the"date.h"library. This timezone library is a complete parser of the IANA timezone database. It provides for an easy way to access all of the data in this database, using the types from"date.h"and<chrono>. The IANA database also includes data on leap seconds, and this library provides utilities to compute with that information as well. See http://howardhinnant.github.io/date/tz.html for more details.Here is the Cppcon 2016 presentation on tz.h: https://www.youtube.com/watch?v=Vwd3pduVGKY
Here are the Cppcon 2016 slides on tz.h: http://schd.ws/hosted_files/cppcon2016/0f/Welcome%20To%20The%20Time%20Zone%20-%20Howard%20Hinnant%20-%20CppCon%202016.pdf
-
"iso_week.h"is a header-only library built on top of the"date.h"library which implements the ISO week date calendar. See http://howardhinnant.github.io/date/iso_week.html for more details. -
"julian.h"is a header-only library built on top of the"date.h"library which implements a proleptic Julian calendar which is fully interoperable with everything above. See http://howardhinnant.github.io/date/julian.html for more details. -
"islamic.h"is a header-only library built on top of the"date.h"library which implements a proleptic Islamic calendar which is fully interoperable with everything above. See http://howardhinnant.github.io/date/islamic.html for more details.
There has been a recent change in the library design. If you are trying to migrate from the previous design, rename day_point to sys_days everywhere, and that ought to bring the number of errors down to a small roar.
"date.h" and "tz.h" are now being proposed for standardization: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0355r2.html