I was able to fetch some of the details separated from HealthKit app, but i have a missing points that i need help with such as getting the below exact data for each workout.
And here is what i tried for Exercise time:
func getExerciseTime(forDate date: Date, _ completion: ((Double, Error?) -> Void)!) {
let cal = Calendar.current
let startDate = cal.startOfDay(for: date)
var comps = DateComponents()
comps.day = 1
comps.second = -1
let endDate = cal.date(byAdding: comps, to: startDate)
let stepsCount = HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.appleExerciseTime)
let predicate = HKQuery.predicateForSamples(withStart: startDate, end: endDate, options: .strictStartDate)
let interval: NSDateComponents = NSDateComponents()
interval.day = 1
let query = HKStatisticsCollectionQuery(quantityType: stepsCount!, quantitySamplePredicate: predicate, options: [.cumulativeSum], anchorDate: startDate as Date, intervalComponents: interval as DateComponents)
query.initialResultsHandler = { query, results, error in
if error != nil {
// Something went Wrong
return
}
var exercise = 0.0
if let myResults = results, let endDate = endDate {
myResults.enumerateStatistics(from: startDate, to: endDate) { statistics, _ in
if let quantity = statistics.sumQuantity() {
exercise = quantity.doubleValue(for: HKUnit.minute())
}
}
}
completion(round(exercise), error)
}
healthKitStore.execute(query)
}
I was able to get the beats but not the average heart rate for the workout:
func getAverageHeartRate(date:Date,completion:
#escaping ([HKWorkout]?, Error?) -> Void) {
guard let heartRateType =
HKObjectType.quantityType(forIdentifier:
HKQuantityTypeIdentifier.heartRate) else {
fatalError("*** Unable to create a Heart rate type ***")
}
let cal = Calendar.current
let startDate = cal.startOfDay(for: date)
var comps = DateComponents()
comps.day = 1
comps.second = -1
let endDate = cal.date(byAdding: comps, to: startDate)
// Get all workouts that only came from this app.
let workoutPredicate = HKQuery.predicateForSamples(withStart: startDate, end: endDate, options: .strictStartDate)
let startDateSort = NSSortDescriptor(key: HKSampleSortIdentifierStartDate, ascending: true)
let query = HKSampleQuery(sampleType: heartRateType,
predicate: workoutPredicate,
limit: 0,
sortDescriptors: [startDateSort]) { (sampleQuery, results, error) -> Void in
guard let heartRateSamples = results as? [HKQuantitySample] else {
// Perform proper error handling here.
return
}
// Use the workout's Heart rate samples here.
for heartrate in heartRateSamples {
let beats: Double? = heartrate.quantity.doubleValue(for: HKUnit.count().unitDivided(by: HKUnit.minute()))
print(heartrate.startDate, heartrate.endDate)
print(beats)
guard beats != nil else {
return
}
}
}
healthKitStore.execute(query)
And lastly:
func getWorkOutData(forDate date: Date, _ completion: ((Int, Error?) -> Void)!) {
let cal = Calendar.current
let startDate = cal.startOfDay(for: date)
var comps = DateComponents()
comps.day = 1
comps.second = -1
let endDate = cal.date(byAdding: comps, to: startDate)
let sortDescriptor = NSSortDescriptor(key: HKSampleSortIdentifierStartDate, ascending: true)
let predicate = HKQuery.predicateForSamples(withStart: startDate, end: endDate, options: HKQueryOptions())
let sampleQuery = HKSampleQuery(sampleType: HKWorkoutType.workoutType(), predicate: predicate, limit: 0, sortDescriptors: [sortDescriptor]) { (_, results, error ) -> Void in
var eligible = 0
if let myResults = results as? [HKWorkout] {
for workout in myResults where workout.duration >= 600 {
eligible += 1
}
}
completion(eligible, error)
}
healthKitStore.execute(sampleQuery)
}
1- I was able to get the heartbeats not the avg heart rate per workout.
2- I couldn't connect the data from each one to be like a workout model that contains Time,Distance,AvgHeart rate.
I'm wondering if there is some new and awesome possibility to get the amount of days between two NSDates in Swift / the "new" Cocoa?
E.g. like in Ruby I would do:
(end_date - start_date).to_i
You have to consider the time difference as well. For example if you compare the dates 2015-01-01 10:00 and 2015-01-02 09:00, days between those dates will return as 0 (zero) since the difference between those dates is less than 24 hours (it's 23 hours).
If your purpose is to get the exact day number between two dates, you can work around this issue like this:
// Assuming that firstDate and secondDate are defined
// ...
let calendar = NSCalendar.currentCalendar()
// Replace the hour (time) of both dates with 00:00
let date1 = calendar.startOfDayForDate(firstDate)
let date2 = calendar.startOfDayForDate(secondDate)
let flags = NSCalendarUnit.Day
let components = calendar.components(flags, fromDate: date1, toDate: date2, options: [])
components.day // This will return the number of day(s) between dates
Swift 3 and Swift 4 Version
let calendar = Calendar.current
// Replace the hour (time) of both dates with 00:00
let date1 = calendar.startOfDay(for: firstDate)
let date2 = calendar.startOfDay(for: secondDate)
let components = calendar.dateComponents([.day], from: date1, to: date2)
Here is my answer for Swift 2:
func daysBetweenDates(startDate: NSDate, endDate: NSDate) -> Int
{
let calendar = NSCalendar.currentCalendar()
let components = calendar.components([.Day], fromDate: startDate, toDate: endDate, options: [])
return components.day
}
I see a couple Swift3 answers so I'll add my own:
public static func daysBetween(start: Date, end: Date) -> Int {
Calendar.current.dateComponents([.day], from: start, to: end).day!
}
The naming feels more Swifty, it's one line, and using the latest dateComponents() method.
Here is very nice, Date extension to get difference between dates in years, months, days, hours, minutes, seconds
extension Date {
func years(sinceDate: Date) -> Int? {
return Calendar.current.dateComponents([.year], from: sinceDate, to: self).year
}
func months(sinceDate: Date) -> Int? {
return Calendar.current.dateComponents([.month], from: sinceDate, to: self).month
}
func days(sinceDate: Date) -> Int? {
return Calendar.current.dateComponents([.day], from: sinceDate, to: self).day
}
func hours(sinceDate: Date) -> Int? {
return Calendar.current.dateComponents([.hour], from: sinceDate, to: self).hour
}
func minutes(sinceDate: Date) -> Int? {
return Calendar.current.dateComponents([.minute], from: sinceDate, to: self).minute
}
func seconds(sinceDate: Date) -> Int? {
return Calendar.current.dateComponents([.second], from: sinceDate, to: self).second
}
}
I translated my Objective-C answer
let start = "2010-09-01"
let end = "2010-09-05"
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let startDate:NSDate = dateFormatter.dateFromString(start)
let endDate:NSDate = dateFormatter.dateFromString(end)
let cal = NSCalendar.currentCalendar()
let unit:NSCalendarUnit = .Day
let components = cal.components(unit, fromDate: startDate, toDate: endDate, options: nil)
println(components)
result
<NSDateComponents: 0x10280a8a0>
Day: 4
The hardest part was that the autocompletion insists fromDate and toDate would be NSDate?, but indeed they must be NSDate! as shown in the reference.
I don't see how a good solution with an operator would look like, as you want to specify the unit differently in each case. You could return the time interval, but than won't you gain much.
Update for Swift 3 iOS 10 Beta 4
func daysBetweenDates(startDate: Date, endDate: Date) -> Int {
let calendar = Calendar.current
let components = calendar.dateComponents([Calendar.Component.day], from: startDate, to: endDate)
return components.day!
}
Swift 5. Thanks to Emin Buğra Saral above for the startOfDay suggestion.
extension Date {
func daysBetween(date: Date) -> Int {
return Date.daysBetween(start: self, end: date)
}
static func daysBetween(start: Date, end: Date) -> Int {
let calendar = Calendar.current
// Replace the hour (time) of both dates with 00:00
let date1 = calendar.startOfDay(for: start)
let date2 = calendar.startOfDay(for: end)
let a = calendar.dateComponents([.day], from: date1, to: date2)
return a.value(for: .day)!
}
}
Usage:
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let start = dateFormatter.date(from: "2017-01-01")!
let end = dateFormatter.date(from: "2018-01-01")!
let diff = Date.daysBetween(start: start, end: end) // 365
// or
let diff = start.daysBetween(date: end) // 365
Here is the answer for Swift 3 (tested for IOS 10 Beta)
func daysBetweenDates(startDate: Date, endDate: Date) -> Int
{
let calendar = Calendar.current
let components = calendar.components([.day], from: startDate, to: endDate, options: [])
return components.day!
}
Then you can call it like this
let pickedDate: Date = sender.date
let NumOfDays: Int = daysBetweenDates(startDate: pickedDate, endDate: Date())
print("Num of Days: \(NumOfDays)")
Swift 5
Working, you need to set the time to be the same for both days, if you are off by seconds it will be wrong
func daysBetween(start: Date, end: Date) -> Int {
let start = Calendar.current.date(bySettingHour: 0, minute: 0, second: 0, of: start)!
let end = Calendar.current.date(bySettingHour: 0, minute: 0, second: 0, of: end)!
return Calendar.current.dateComponents([.day], from: start, to: end).day ?? 0
}
The things built into swift are still very basic. As they should be at this early stage. But you can add your own stuff with the risk that comes with overloading operators and global domain functions. They will be local to your module though.
let now = NSDate()
let seventies = NSDate(timeIntervalSince1970: 0)
// Standard solution still works
let days = NSCalendar.currentCalendar().components(.CalendarUnitDay,
fromDate: seventies, toDate: now, options: nil).day
// Flashy swift... maybe...
func -(lhs:NSDate, rhs:NSDate) -> DateRange {
return DateRange(startDate: rhs, endDate: lhs)
}
class DateRange {
let startDate:NSDate
let endDate:NSDate
var calendar = NSCalendar.currentCalendar()
var days: Int {
return calendar.components(.CalendarUnitDay,
fromDate: startDate, toDate: endDate, options: nil).day
}
var months: Int {
return calendar.components(.CalendarUnitMonth,
fromDate: startDate, toDate: endDate, options: nil).month
}
init(startDate:NSDate, endDate:NSDate) {
self.startDate = startDate
self.endDate = endDate
}
}
// Now you can do this...
(now - seventies).months
(now - seventies).days
This is an updated version of Emin's answer for Swift 5 that incorporates the suggestion to use noon instead of midnight as the definitive time for comparing days. It also handles the potential failure of various date functions by returning an optional.
///
/// This is an approximation; it does not account for time differences. It will set the time to 1200 (noon) and provide the absolute number
/// of days between now and the given date. If the result is negative, it should be read as "days ago" instead of "days from today."
/// Returns nil if something goes wrong initializing or adjusting dates.
///
func daysFromToday() -> Int?
{
let calendar = NSCalendar.current
// Replace the hour (time) of both dates with noon. (Noon is less likely to be affected by DST changes, timezones, etc. than midnight.)
guard let date1 = calendar.date(bySettingHour: 12, minute: 00, second: 00, of: calendar.startOfDay(for: Date())),
let date2 = calendar.date(bySettingHour: 12, minute: 00, second: 00, of: calendar.startOfDay(for: self)) else
{
return nil
}
return calendar.dateComponents([.day], from: date1, to: date2).day
}
Here is my answer for Swift 3:
func daysBetweenDates(startDate: NSDate, endDate: NSDate, inTimeZone timeZone: TimeZone? = nil) -> Int {
var calendar = Calendar.current
if let timeZone = timeZone {
calendar.timeZone = timeZone
}
let dateComponents = calendar.dateComponents([.day], from: startDate.startOfDay, to: endDate.startOfDay)
return dateComponents.day!
}
You could use the following extension:
public extension Date {
func daysTo(_ date: Date) -> Int? {
let calendar = Calendar.current
// Replace the hour (time) of both dates with 00:00
let date1 = calendar.startOfDay(for: self)
let date2 = calendar.startOfDay(for: date)
let components = calendar.dateComponents([.day], from: date1, to: date2)
return components.day // This will return the number of day(s) between dates
}
}
Then, you can call it like this:
startDate.daysTo(endDate)
There's hardly any Swift-specific standard library yet; just the lean basic numeric, string, and collection types.
It's perfectly possible to define such shorthands using extensions, but as far as the actual out-of-the-box APIs goes, there is no "new" Cocoa; Swift just maps directly to the same old verbose Cocoa APIs as they already exist.
I'm going to add my version even though this thread is a year old. My code looks like this:
var name = txtName.stringValue // Get the users name
// Get the date components from the window controls
var dateComponents = NSDateComponents()
dateComponents.day = txtDOBDay.integerValue
dateComponents.month = txtDOBMonth.integerValue
dateComponents.year = txtDOBYear.integerValue
// Make a Gregorian calendar
let calendar = NSCalendar(identifier: NSCalendarIdentifierGregorian)
// Get the two dates we need
var birthdate = calendar?.dateFromComponents(dateComponents)
let currentDate = NSDate()
var durationDateComponents = calendar?.components(NSCalendarUnit.CalendarUnitDay, fromDate: birthdate!, toDate: currentDate, options: nil)
let numberOfDaysAlive = durationDateComponents?.day
println("\(numberOfDaysAlive!)")
txtGreeting.stringValue = "Hello \(name), You have been alive for \(numberOfDaysAlive!) days."
I hope it helps someone.
Cheers,
Erin's method updated to Swift 3, This shows days from today (disregarding time of day)
func daysBetweenDates( endDate: Date) -> Int
let calendar: Calendar = Calendar.current
let date1 = calendar.startOfDay(for: Date())
let date2 = calendar.startOfDay(for: secondDate)
return calendar.dateComponents([.day], from: date1, to: date2).day!
}
This returns an absolute difference in days between some Date and today:
extension Date {
func daysFromToday() -> Int {
return abs(Calendar.current.dateComponents([.day], from: self, to: Date()).day!)
}
}
and then use it:
if someDate.daysFromToday() >= 7 {
// at least a week from today
}
easier option would be to create a extension on Date
public extension Date {
public var currentCalendar: Calendar {
return Calendar.autoupdatingCurrent
}
public func daysBetween(_ date: Date) -> Int {
let components = currentCalendar.dateComponents([.day], from: self, to: date)
return components.day!
}
}
Swift 3.2
extension DateComponentsFormatter {
func difference(from fromDate: Date, to toDate: Date) -> String? {
self.allowedUnits = [.year,.month,.weekOfMonth,.day]
self.maximumUnitCount = 1
self.unitsStyle = .full
return self.string(from: fromDate, to: toDate)
}
}
All answer is good. But for Localizations we need calculates a number of decimal days in between two dates. so we can provide the sustainable decimal format.
// This method returns the fractional number of days between to dates
func getFractionalDaysBetweenDates(date1: Date, date2: Date) -> Double {
let components = Calendar.current.dateComponents([.day, .hour], from: date1, to: date2)
var decimalDays = Double(components.day!)
decimalDays += Double(components.hour!) / 24.0
return decimalDays
}
Nice handy one liner :
extension Date {
var daysFromNow: Int {
return Calendar.current.dateComponents([.day], from: Date(), to: self).day!
}
}
Swift 3 - Days from today until date
func daysUntilDate(endDateComponents: DateComponents) -> Int
{
let cal = Calendar.current
var components = cal.dateComponents([.era, .year, .month, .day], from: NSDate() as Date)
let today = cal.date(from: components)
let otherDate = cal.date(from: endDateComponents)
components = cal.dateComponents([Calendar.Component.day], from: (today! as Date), to: otherDate!)
return components.day!
}
Call function like this
// Days from today until date
var examnDate = DateComponents()
examnDate.year = 2016
examnDate.month = 12
examnDate.day = 15
let daysCount = daysUntilDate(endDateComponents: examnDate)
extension Date {
func daysFromToday() -> Int {
return Calendar.current.dateComponents([.day], from: self, to: Date()).day!
}
}
Then use it like
func dayCount(dateString: String) -> String{
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MMM dd,yyyy hh:mm a"
let fetchedDate = dateFormatter.date(from: dateString)
let day = fetchedDate?.daysFromToday()
if day! > -1{
return "\(day!) days passed."
}else{
return "\(day! * -1) days left."
}
}
extension Date {
static func - (recent: Date, previous: Date) -> DateComponents {
var dateComponents = DateComponents()
dateComponents.year = Calendar.current.dateComponents([.day], from: previous, to: recent).year
dateComponents.month = Calendar.current.dateComponents([.month], from: previous, to: recent).month
dateComponents.day = Calendar.current.dateComponents([.day], from: previous, to: recent).day
dateComponents.hour = Calendar.current.dateComponents([.hour], from: previous, to: recent).hour
dateComponents.minute = Calendar.current.dateComponents([.minute], from: previous, to: recent).minute
dateComponents.second = Calendar.current.dateComponents([.second], from: previous, to: recent).second
return dateComponents
}
}
func completeOffset(from date:Date) -> String? {
let formatter = DateComponentsFormatter()
formatter.unitsStyle = .brief
return formatter.string(from: Calendar.current.dateComponents([.year, .month, .day, .hour, .minute, .second], from: date, to: self))
}
if you need year month days and hours as string use this
var tomorrow = Calendar.current.date(byAdding: .day, value: 1, to: Date())!
let dc = tomorrow.completeOffset(from: Date())
2017 version, copy and paste
func simpleIndex(ofDate: Date) -> Int {
// index here just means today 0, yesterday -1, tomorrow 1 etc.
let c = Calendar.current
let todayRightNow = Date()
let d = c.date(bySetting: .hour, value: 13, of: ofDate)
let t = c.date(bySetting: .hour, value: 13, of: todayRightNow)
if d == nil || today == nil {
print("weird problem simpleIndex#ofDate")
return 0
}
let r = c.dateComponents([.day], from: today!, to: d!)
// yesterday is negative one, tomorrow is one
if let o = r.value(for: .day) {
return o
}
else {
print("another weird problem simpleIndex#ofDate")
return 0
}
}
let calendar = NSCalendar.currentCalendar();
let component1 = calendar.component(.Day, fromDate: fromDate)
let component2 = calendar.component(.Day, fromDate: toDate)
let difference = component1 - component2
Swift 5.2.4 solution:
import UIKit
let calendar = Calendar.current
let start = "2010-09-01"
let end = "2010-09-05"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let firstDate = dateFormatter.date(from: start)!
let secondDate = dateFormatter.date(from: end)!
// Replace the hour (time) of both dates with 00:00
let date1 = calendar.startOfDay(for: firstDate)
let date2 = calendar.startOfDay(for: secondDate)
let components = calendar.dateComponents([Calendar.Component.day], from: date1, to: date2)
components.day // This will return the number of day(s) between dates
I have a function to work out the start and end of a week which works as expected. I want to implement another function which works out the start and end of a single day. I have the code below however I get the following error:
Type of expression is ambiguous without more context.
public class Date {
let dateFormatter = NSDateFormatter()
let date = NSDate()
let calendar = NSCalendar.currentCalendar()
func calcStartAndEndDateForWeek(durationOccurance: Double) {
print("Calculating start and end for week")
let componentsWeek = calendar.components([.YearForWeekOfYear, .WeekOfYear], fromDate: date)
let startOfWeek = calendar.dateFromComponents(componentsWeek)!
print("start of Week = \(dateFormatter.stringFromDate(startOfWeek))")
let componentsWeekEnds = NSDateComponents()
componentsWeekEnds.weekOfYear = 1
let endOfWeek = calendar.dateByAddingComponents(componentsWeekEnds, toDate: startOfWeek, options: [])!
print("End of the week = \(dateFormatter.stringFromDate(endOfWeek))")
}
func calcStartAndEndDateForDay(durationOccurance: Double) {
print("Calculating start and end for day")
let componentsWeek = calendar.components([.Minutes, .Seconds], fromDate: date)
let startOfDay = calendar.dateFromComponents(componentsWeek)!
print("start day = \(dateFormatter.stringFromDate(startOfDay))")
}
init(){
dateFormatter.dateFormat = "dd-MM-yyyy"
}
}
We can create a more generic function using the methods on NSCalendar:
func rangeOfPeriod(period: NSCalendarUnit, date: NSDate) -> (NSDate, NSDate) {
let calendar = NSCalendar.currentCalendar()
var startDate: NSDate? = nil
// let's ask calendar for the start of the period
calendar.rangeOfUnit(period, startDate: &startDate, interval: nil, forDate: date)
// end of this period is the start of the next period
let endDate = calendar.dateByAddingUnit(period, value: 1, toDate: startDate!, options: [])
// you can subtract 1 second if you want to make "Feb 1 00:00:00" into "Jan 31 23:59:59"
// let endDate2 = calendar.dateByAddingUnit(.Second, value: -1, toDate: endDate!, options: [])
return (startDate!, endDate!)
}
Called as
print("\(rangeOfPeriod(.WeekOfYear, date: NSDate()))")
print("\(rangeOfPeriod(.Day, date: NSDate()))")
Putting it into your code:
public class Date {
let dateFormatter = NSDateFormatter()
let date = NSDate()
let calendar = NSCalendar.currentCalendar()
func rangeOfPeriod(period: NSCalendarUnit) -> (NSDate, NSDate) {
var startDate: NSDate? = nil
calendar.rangeOfUnit(period, startDate: &startDate, interval: nil, forDate: date)
let endDate = calendar.dateByAddingUnit(period, value: 1, toDate: startDate!, options: [])
return (startDate!, endDate!)
}
func calcStartAndEndDateForWeek() {
let (startOfWeek, endOfWeek) = rangeOfPeriod(.WeekOfYear)
print("Start of week = \(dateFormatter.stringFromDate(startOfWeek))")
print("End of the week = \(dateFormatter.stringFromDate(endOfWeek))")
}
func calcStartAndEndDateForDay() {
let (startOfDay, endOfDay) = rangeOfPeriod(.Day)
print("Start of day = \(dateFormatter.stringFromDate(startOfDay))")
print("End of the day = \(dateFormatter.stringFromDate(endOfDay))")
}
init() {
dateFormatter.dateFormat = "dd-MM-yyyy"
}
}
let myDate = Date()
myDate.calcStartAndEndDateForWeek()
myDate.calcStartAndEndDateForDay()
I was implementing something similar and went the following route:
extension Date {
static var startOfToday: Date? {
let date = Date()
guard !date.isStartOfDay else { return date }
return date
.zero(out: .second)?
.zero(out: .minute)?
.zero(out: .hour)?
.addingTimeInterval(-24 * 60 * 60)
}
private func zero(out: Calendar.Component) -> Date? {
return Calendar.current
.date(bySetting: out, value: 0, of: self)
}
private var isStartOfDay: Bool {
let cal = Calendar.current
let hours = cal.component(.hour, from: self)
let minutes = cal.component(.minute, from: self)
let seconds = cal.component(.second, from: self)
return hours == 0 && minutes == 0 && seconds == 0
}
}
Setting a component to zero will increment the next bigger component. So just setting the hour to zero will push the date to the next day at 00:00, unless of course the hour is already at zero. So to make it work for any date we have to zero out the seconds, minutes and hours (in that order). And to make sure we don't end up at the beginning of yesterday we first check if all values aren't already at zero.
I realize this is kinda hacky and probably not the best way to go about this, but it seems to work well enough for my use-case at least.
Getting the end of the day can be built on top of this by just adding another day.