我正在编写一个Python函数/ class / module / gizmo来将以下值转换为YYYY-MM-DD。我不愿意接受使用非标准dateutil来实现更轻松的实施。
我不希望stackoverflow社区简单地“为我写这整件事”，我可能会在完成后回答我自己的问题。一路上，任何指针都非常感激。我还没有找到一个全面解决我的需求的Q + A讨论，但当然我会从那些解决部分内容的人那里借用。例如："find Monday's"和"timedelta in years"以及"six months out"。
另外：如果有一个现有的，成熟的库（即使它是一个非标准库）来处理一些/更多/所有这些，它可能会为我节省大量工作。谢谢你的帮助。
case-insensitive match and conversion of any of the following to YYYY-MM-DD
today
tomorrow
yesterday
monday = next monday
tuesday = next tuesday
wednesday = next wednesday
thursday = next thursday
friday = next friday
saturday = next saturday
sunday = next sunday
-monday = last monday
-tuesday = last tuesday
-wednesday = last wednesday
-thursday = last thursday
-friday = last friday
-saturday = last saturday
-sunday = last sunday
x[d|w|m|y] = 'x' number of days/weeks/months/years in future
-x[d|w|m|y] = 'x' number of days/weeks/months/years in past
examples
1d = 1 day from today
2w = 2 weeks from today
3m = 3 months from today
4y = 4 years from today
-4d = 4 days ago
-3w = 3 weeks ago
-2m = 2 months ago
-1y = 1 year ago
unique truncations of today, tomorrow, yesterday, and
days of week (monday, tuesday) are matched with their
expanded values. eg: 'mo', '-Tues', 'tom', 'yest', 'tod'