I found an error within LocalTime, probably concern LocalDate/LocalDateTime as well. Given two times: 17:50:23:372247993 > 17:57:39:0 will return true Left is clearly before, however, since left nano is greater than right nano, left will be wrongly considered superior.

I think, this project's maintainer @Kawoou has to notify to everyone, the Long Term Release Plan.

I guess that you have quite much more ideas about Swift's useful Date & Time Library, so please tell us your roadmap.

Value types like LocalDate should conform to the Hashable protocol so they can be used as dictionary keys.

We could just take the implementation directly from the hashCode() methods in java.time. For example, java.time.LocalDate has the following implementation of hashCode():

public int hashCode() {
  int yearValue = this.year;
  int monthValue = this.month;
  int dayValue = this.day;
  return yearValue & -2048 ^ (yearValue << 11) + (monthValue << 6) + dayValue;
}

SO: Ubuntu 16.04 Swift: 3.1

Code:

print("starting \(market.marketStartTime!)")
let gmt = Clock.GMT
print("2")
 var marketStartTime = ZonedDateTime.parse(market.marketStartTime!, clock: gmt)
print("3")
 marketStartTime = marketStartTime?.plus(minute: 3)
print("4")

Result:

starting 2017-09-24T17:00:00.000Z
2
Segmentation fault (core dumped)

It looks like you combined everything from java.time.Period and java.time.Duration into a single implementation of Period. While I don't disagree with this as a design decision, I think it's more important for the goals of this library (i.e. Java parity) to keep these as two separate classes.

What is lunar calendar?

Lunar calendar

Lunar calendar is a calendar based upon cycles of the Moon's phases.

Gregorian calendar is also common and legal use in most countries, but also traditional lunar and lunisolar calendears continue to be used in many countries to determine religious festivals and national holidays.

But, unfortunately, unlike gregorian calendar, there are several seperated lunar calendar systems:

• Korean calendar
• Chinese calendar
• Japanese calendar
• Vietnamese calendar
• Mongolian calendar
• Islamic calendar
• Hebrew calendar

I can strongly urge that: good application/solution/service have to understand about users and also their habit, tradition and life; even if they are using some unfamiliar calendar.

If AnyDate supports about all other calendars, it can very helpful to development global things.

What is ThreeTen-Extra

ThreeTen-Extra

ThreeTen-Extra provides additional date-time classes that complement those in Java SE 8.

Features:

• DayOfMonth
• DayOfYear
• AmPm
• Quarter
• YearQuarter
• YearWeek
• Days, Weeks, Months and Years
• Interval
• PeriodDuration
• Weekend adjusters
• Coptic calendar system
• Ethiopic calendar system
• Julian calendar system
• Support for the TAI and UTC time-scales

I know that few of these features already implemented in AnyDate, and yet other features seems be quite useful in Swift Application Programming.