Date parsing ported to date library.

Author: offa

3rd-party/CMakeLists.txt

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+add_library(date INTERFACE)
+target_include_directories(date INTERFACE "${CMAKE_CURRENT_LIST_DIR}")

3rd-party/date/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015, 2016, 2017 Howard Hinnant
+Copyright (c) 2016 Adrian Colomitchi
+Copyright (c) 2017 Florian Dang
+Copyright (c) 2017 Paul Thompson
+Copyright (c) 2018, 2019 Tomasz Kamiński
+Copyright (c) 2019 Jiangang Zhuang
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

3rd-party/date/README.md

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+# date
+
+A date and time library based on the C++11/14/17 <chrono> header
+
+Visit the [date project](https://github.com/HowardHinnant/date) for further information.