Swift Dates

BSD. Use at your own risk.

Various datelike things.

Date Utilities

• Adds sharedCalendar and now as Date static property
• Implements date properites for time interval and component retrieval
• Date characteristics (past, future, weekend, weekday)
• Time interval between two dates, from one date to another, single component distance
• Returning days/hours/minutes/seconds to another date
• Offsets (dhms) to another date
• Nearest hour and minute
• Start of day, end of day, end of today, start of week, next week, last week, this week, start of year, next year, last year
• Today, tomorrow, yesterday for real time and for a given date
• Whether two dates are on the same day, same week, same year

Date Math

• Common time intervals (smhdw)
• Integer interval math (1.day, 2.weeks, etc, smhdw)
• Date + Components
• Components +/- Components

Date Formatting

• ISO 8601 formatter, short/medium/long/full date and time formatters
• ISO 8601/short/medium/long/full date strings
• Short/medium/long/full time strings

Calendar Utilities

• Comprehensive component(of date: Date) for all standard components, for any calendar.

Date Component Utilities

• Common, comprehensive, MDY, HMS, MDYHMS component sets
• Common, comprehensive, MDY, HMS, and MDYHMS component date properties
• Populate date components by single MDYHMSn component counts
• Offset date by count of a single component:
  • offset(_ component: Calendar.Component, _ count: Int) -> Date
• Date component subscripting
• Initialize date components from time interval DateComponents(ti:)
• Return a set of members making up an individual date component instance
• Standardization: trimmed (zero-valued components removed, normalized (all positive values), timeInteval (representation of the date components as a time interval offset from the reference date)
• Presentation: standard, relative, approximate

let dc = DateComponents(minute: 7, second: 5)
print(dc.description(remaining: true, approximate: true)) 
// About 7 minutes, 5 seconds remaining
print(dc.description(style: .approximate)) 
// About 7 minutes from now
print(dc.description(style: .relative)) 
// 7 minutes, 5 seconds from now
print(dc.description(style: .standard)) 
// 7 minutes, 5 seconds
let units: [DateComponentsFormatter.UnitsStyle] = 
    [.positional, .abbreviated, .short, .full, .spellOut]
// 7:05, 7m 5s, 7 min, 5 sec, 7 minutes, 5 seconds, seven minutes, five seconds