IOSで「1日前」、「数分前」のように日付を文字列にフォーマットする方法は？
ここでJSON解析データを含むアプリケーションを作成します。これは「2014-12-0208：00：42」のような日付を含むJSON解析データです。次に、この日付を次のような形式「12FEB2014」に変換します。
NSDateFormatter * dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"yyyy-MM-dd hh:mm:ss"];
NSString *date=[dict valueForKey:@"post_date"];
NSDate * dateNotFormatted = [dateFormatter dateFromString:date];
[dateFormatter setDateFormat:@"d MMM YYYY"];
NSString * dateFormatted = [dateFormatter stringFromDate:dateNotFormatted];
cell.timeLabel.text=[dateFormatted uppercaseString];
正常に動作していますが、このdateFormatted文字列を「OneDay Ago」、「MinutesAgo」に変換したいと思います。私はこの質問が以前に何度も尋ねられることを知っています。
IOS 8以降、NSDateComponentsFormatterを使用すると、多くのヘルプ（localizationを含む）を取得できます。注：「2日、3時間、5分前」のような文字列を返したい場合は、コンポーネントフォーマッタのallowedUnitsを変更することで、文字列が表示する粒度を簡単に変更できます。
Swift 4：
func timeAgoStringFromDate(date: Date) -> String? {
let formatter = DateComponentsFormatter()
formatter.unitsStyle = .full
let now = Date()
let calendar = NSCalendar.current
let components1: Set<Calendar.Component> = [.year, .month, .weekOfMonth, .day, .hour, .minute, .second]
let components = calendar.dateComponents(components1, from: date, to: now)
if components.year ?? 0 > 0 {
formatter.allowedUnits = .year
} else if components.month ?? 0 > 0 {
formatter.allowedUnits = .month
} else if components.weekOfMonth ?? 0 > 0 {
formatter.allowedUnits = .weekOfMonth
} else if components.day ?? 0 > 0 {
formatter.allowedUnits = .day
} else if components.hour ?? 0 > 0 {
formatter.allowedUnits = [.hour]
} else if components.minute ?? 0 > 0 {
formatter.allowedUnits = .minute
} else {
formatter.allowedUnits = .second
}
let formatString = NSLocalizedString("%@ left", comment: "Used to say how much time has passed. e.g. '2 hours ago'")
guard let timeString = formatter.string(for: components) else {
return nil
}
return String(format: formatString, timeString)
}
let str = timeAgoStringFromDate(date: Date().addingTimeInterval(-11000))
// Result: "3 hours, 3 minutes left"
スイフト：
class func timeAgoStringFromDate(date: NSDate) -> NSString? {
let formatter = NSDateComponentsFormatter()
formatter.unitsStyle = .Full
let now = NSDate()
let calendar = NSCalendar.currentCalendar()
let components = calendar.components([NSCalendarUnit.Year, .Month, .WeekOfMonth, .Day, .Hour, .Minute, .Second],
fromDate: date,
toDate: now,
options:NSCalendarOptions(rawValue: 0))
if components.year > 0 {
formatter.allowedUnits = .Year
} else if components.month > 0 {
formatter.allowedUnits = .Month
} else if components.weekOfMonth > 0 {
formatter.allowedUnits = .WeekOfMonth
} else if components.day > 0 {
formatter.allowedUnits = .Day
} else if components.hour > 0 {
formatter.allowedUnits = .Hour
} else if components.minute > 0 {
formatter.allowedUnits = .Minute
} else {
formatter.allowedUnits = .Second
}
let formatString = NSLocalizedString("%@ ago", comment: "Used to say how much time has passed. e.g. '2 hours ago'")
guard let timeString = formatter.stringFromDateComponents(components) else {
return nil
}
return String(format: formatString, timeString)
}
Objective-C：
+ (NSString *)timeAgoStringFromDate:(NSDate *)date {
NSDateComponentsFormatter *formatter = [[NSDateComponentsFormatter alloc] init];
formatter.unitsStyle = NSDateComponentsFormatterUnitsStyleFull;
NSDate *now = [NSDate date];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:(NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitWeekOfMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond)
fromDate:date
toDate:now
options:0];
if (components.year > 0) {
formatter.allowedUnits = NSCalendarUnitYear;
} else if (components.month > 0) {
formatter.allowedUnits = NSCalendarUnitMonth;
} else if (components.weekOfMonth > 0) {
formatter.allowedUnits = NSCalendarUnitWeekOfMonth;
} else if (components.day > 0) {
formatter.allowedUnits = NSCalendarUnitDay;
} else if (components.hour > 0) {
formatter.allowedUnits = NSCalendarUnitHour;
} else if (components.minute > 0) {
formatter.allowedUnits = NSCalendarUnitMinute;
} else {
formatter.allowedUnits = NSCalendarUnitSecond;
}
NSString *formatString = NSLocalizedString(@"%@ ago", @"Used to say how much time has passed. e.g. '2 hours ago'");
return [NSString stringWithFormat:formatString, [formatter stringFromDateComponents:components]];
}
@jDuttonの簡略化された実装
Swift4、Swift
extension Date {
var timestampString: String? {
let formatter = DateComponentsFormatter()
formatter.unitsStyle = .full
formatter.maximumUnitCount = 1
formatter.allowedUnits = [.year, .month, .day, .hour, .minute, .second]
guard let timeString = formatter.string(from: self, to: Date()) else {
return nil
}
let formatString = NSLocalizedString("%@ ago", comment: "")
return String(format: formatString, timeString)
}
}
Swift2
extension NSDate {
var timestampString: String? {
let formatter = NSDateComponentsFormatter()
formatter.unitsStyle = .Full
formatter.maximumUnitCount = 1
formatter.allowedUnits = [.Year, .Month, .Day, .Hour, .Minute, .Second]
guard let timeString = formatter.stringFromDate(self, toDate: NSDate()) else {
return nil
}
let formatString = NSLocalizedString("%@ ago", comment: "")
return String(format: formatString, timeString)
}
}
私はそれを達成するために DateTools を使用しました。 Cocoapodsのインストールをサポートします。
そのように動作します。
NSDate *timeAgoDate = [NSDate dateWithTimeIntervalSinceNow:-4];
NSLog(@"Time Ago: %@", timeAgoDate.timeAgoSinceNow);
NSLog(@"Time Ago: %@", timeAgoDate.shortTimeAgoSinceNow);
//Output:
//Time Ago: 4 seconds ago
//Time Ago: 4s
Githubページから取得（ https://github.com/MatthewYork/DateTools ）
Swift 5でRelativeDateTimeFormatterを使用します。
let formatter = RelativeDateTimeFormatter()
formatter.localizedString(from: DateComponents(day: -1)) // "1 day ago"
formatter.localizedString(from: DateComponents(hour: 2)) // "in 2 hours"
formatter.localizedString(from: DateComponents(minute: 45)) // "in 45 minutes"
dateTimeStyleを設定して、ローカライズされた直示ステートメントを取得します。 -
formatter.dateTimeStyle = .named
formatter.localizedString(from: DateComponents(day: -1)) // "yesterday"
この関数は、秒から年までNSStringを返します。日付が「1秒前」の場合や「1分前」や「1年前」の場合など、同様に戻ります。
+(NSString*)HourCalculation:(NSString*)PostDate
{
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSTimeZone *gmt = [NSTimeZone timeZoneWithAbbreviation:@"GMT"];
[dateFormat setTimeZone:gmt];
NSDate *ExpDate = [dateFormat dateFromString:PostDate];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:(NSDayCalendarUnit|NSWeekCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit|NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit) fromDate:ExpDate toDate:[NSDate date] options:0];
NSString *time;
if(components.year!=0)
{
if(components.year==1)
{
time=[NSString stringWithFormat:@"%ld year",(long)components.year];
}
else
{
time=[NSString stringWithFormat:@"%ld years",(long)components.year];
}
}
else if(components.month!=0)
{
if(components.month==1)
{
time=[NSString stringWithFormat:@"%ld month",(long)components.month];
}
else
{
time=[NSString stringWithFormat:@"%ld months",(long)components.month];
}
}
else if(components.week!=0)
{
if(components.week==1)
{
time=[NSString stringWithFormat:@"%ld week",(long)components.week];
}
else
{
time=[NSString stringWithFormat:@"%ld weeks",(long)components.week];
}
}
else if(components.day!=0)
{
if(components.day==1)
{
time=[NSString stringWithFormat:@"%ld day",(long)components.day];
}
else
{
time=[NSString stringWithFormat:@"%ld days",(long)components.day];
}
}
else if(components.hour!=0)
{
if(components.hour==1)
{
time=[NSString stringWithFormat:@"%ld hour",(long)components.hour];
}
else
{
time=[NSString stringWithFormat:@"%ld hours",(long)components.hour];
}
}
else if(components.minute!=0)
{
if(components.minute==1)
{
time=[NSString stringWithFormat:@"%ld min",(long)components.minute];
}
else
{
time=[NSString stringWithFormat:@"%ld mins",(long)components.minute];
}
}
else if(components.second>=0)
{
if(components.second==0)
{
time=[NSString stringWithFormat:@"1 sec"];
}
else
{
time=[NSString stringWithFormat:@"%ld secs",(long)components.second];
}
}
return [NSString stringWithFormat:@"%@ ago",time];
}
Swift 3、Xcodeバージョン8.2.1：
func elapsedTime () -> String
{
//just to create a date that is before the current time
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
dateFormatter.locale = Locale(identifier: "en_GB")
let before = dateFormatter.date(from: "2016-11-16 16:28:17")!
let formatter = DateComponentsFormatter()
formatter.unitsStyle = .full
formatter.zeroFormattingBehavior = .dropAll
formatter.maximumUnitCount = 1 //increase it if you want more precision
formatter.allowedUnits = [.year, .month, .weekOfMonth, .day, .hour, .minute]
formatter.includesApproximationPhrase = true //to write "About" at the beginning
let formatString = NSLocalizedString("%@ ago", comment: "Used to say how much time has passed. e.g. '2 hours ago'")
let timeString = formatter.string(from: before, to: Date())
return String(format: formatString, timeString!)
}
1つのオプションは、現在の時刻と前の時刻を比較し、スイッチケースを実装して、必要な文字列を取得することです。
または、次のライブラリのいずれかを使用できます。
Swiftのライブラリを作成しました。ここから入手できます： 過去
ここにも例があります： https://github.com/tneginareb/Time-Ago-iOS
入力変数「timeAtMiliseconds」を変更できます。私の例では、日付の形式はミリ秒でした。
+(NSString *) parseDate: (long)dayago{
if(dayago == 0)
return @"";
NSString *timeLength =[NSString stringWithFormat:@"%lu",dayago];
NSUInteger length = [timeLength length];
if(length == 13){
dayago = dayago / 1000;
}
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *createdDate = [NSDate dateWithTimeIntervalSince1970:dayago];
NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"GMT"];
[dateFormatter setTimeZone:timeZone];
NSString *formattedDateString = [dateFormatter stringFromDate:createdDate];
if([self todaysIsLess:formattedDateString]){
return @"";
}
NSString *timeLeft;
NSDate *currentDate =[NSDate date];
NSInteger seconds = [currentDate timeIntervalSinceDate:createdDate];
NSInteger days = (int) (floor(seconds / (3600 * 24)));
if(days) seconds -= days * 3600 * 24;
NSInteger hours = (int) (floor(seconds / 3600));
if(hours) seconds -= hours * 3600;
NSInteger minutes = (int) (floor(seconds / 60));
if(minutes) seconds -= minutes * 60;
if(days) {
timeLeft = [NSString stringWithFormat:@"%ld Days", (long)days*-1];
}
else if(hours) { timeLeft = [NSString stringWithFormat: @"%ld H", (long)hours*-1];
}
else if(minutes) { timeLeft = [NSString stringWithFormat: @"%ld M", (long)minutes*-1];
}
else if(seconds)
timeLeft = [NSString stringWithFormat: @"%lds", (long)seconds*-1];
//NSLog(@"Days: %lu <> Hours: %lu <> Minutes: %lu <> Seconds: %lu",days,hours,minutes,seconds);
NSString *result = [[NSString alloc]init];
if (days == 0) {
if (hours == 0) {
if (minutes == 0) {
if (seconds < 0) {
return @"0s";
} else {
if (seconds < 59) {
return @"now";
}
}
} else {
return [NSString stringWithFormat:@"%lum",minutes];
}
} else {
return [NSString stringWithFormat:@"%luh",hours];
}
} else {
if (days <= 29) {
return [NSString stringWithFormat: @"%lud",days];
}
if (days > 29 && days <= 58) {
return @"1Mth";
}
if (days > 58 && days <= 87) {
return @"2Mth";
}
if (days > 87 && days <= 116) {
return @"3Mth";
}
if (days > 116 && days <= 145) {
return @"4Mth";
}
if (days > 145 && days <= 174) {
return @"5Mth";
}
if (days > 174 && days <= 203) {
return @"6Mth";
}
if (days > 203 && days <= 232) {
return @"7Mth";
}
if (days > 232 && days <= 261) {
return @"8Mth";
}
if (days > 261 && days <= 290) {
return @"9Mth";
}
if (days > 290 && days <= 319) {
return @"10Mth";
}
if (days > 319 && days <= 348) {
return @"11Mth";
}
if (days > 348 && days <= 360) {
return @"12Mth";
}
if (days > 360 && days <= 720) {
return @"1Yrs";
}
if (days > 720) {
NSDateFormatter *formatter1 = [[NSDateFormatter alloc] init];
[formatter1 setDateFormat:@"MM/dd/yyyy"];
NSString *fdisplay = [formatter1 stringFromDate:createdDate];
return fdisplay;
}
}
return result;
}
-(BOOL) todaysIsLess: (NSString *)dateToCompare{
NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"GMT"];
NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc] init];
[dateFormatter1 setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
[dateFormatter1 setTimeZone:timeZone];
NSDate *today = [NSDate date];
NSDate *newDate = [dateFormatter1 dateFromString:dateToCompare];
NSComparisonResult result;
result = [today compare:newDate];
if(result==NSOrderedAscending)
return true;
return false;
}
使用方法の例：
long createdDate = 1433183206;//1433183206 --> 01 June 2015
NSLog(@"Parse Date: %@",[self parseDate:createdDate]);
//String to store the date from json response
NSString *firstDateString;
//Dateformatter as per the response date
NSDateFormatter *df=[[NSDateFormatter alloc] init];
// Set the date format according to your needs
[df setTimeZone:[NSTimeZone timeZoneWithName:@"America/Toronto"]];
//[df setDateFormat:@"MM/dd/YYYY HH:mm "] // for 24 hour format
[df setDateFormat:@"YYYY-MM-dd HH:mm:ss"]; // 12 hour format
firstDateString = value from json;
//converting the date to required format.
NSDate *date1 = [df dateFromString:firstDateString];
NSDate *date2 = [df dateFromString:[df stringFromDate:[NSDate date]]];
//Calculating the time interval
NSTimeInterval secondsBetween = [date2 timeIntervalSinceDate:date1];
int numberOfDays = secondsBetween / 86400;
int timeResult = ((int)secondsBetween % 86400);
int hour = timeResult / 3600;
int hourResult = ((int)timeResult % 3600);
int minute = hourResult / 60;
if(numberOfDays > 0)
{
if(numberOfDays == 1)
{
Nslog("%@", [NSString stringWithFormat:@"%d %@",numberOfDays,@"day ago"]);
}
else
{
Nslog("%@", [NSString stringWithFormat:@"%d %@",numberOfDays,@"days ago"]);
}
}
else if(numberOfDays == 0 && hour > 0)
{
if(numberOfDays == 0 && hour == 1)
{
cell.newsDateLabel.text = [NSString stringWithFormat:@"%d %@",hour,@"hour ago"];
}
else
{
cell.newsDateLabel.text = [NSString stringWithFormat:@"%d %@",hour,NSLocalizedString(@"news_hours_ago",nil)];
}
}
else if(numberOfDays == 0 && hour == 0 && minute > 0)
{
if(numberOfDays == 0 && hour == 0 && minute == 1)
{
cell.newsDateLabel.text = [NSString stringWithFormat:@"%d %@",minute,@"minute ago"];
}
else
{
cell.newsDateLabel.text = [NSString stringWithFormat:@"%d %@",minute,NSLocalizedString(@"news_minutes_ago",nil)];
}
}
else
{
cell.newsDateLabel.text = [NSString stringWithFormat:NSLocalizedString(@"news_seconds_ago",nil)];
}
次のコードを試してください。
+ (NSString*) getTimestampForDate:(NSDate*)sourceDate {
// Timezone Offset compensation
NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithName:@"America/New_York"];
NSTimeZone* destinationTimeZone = [NSTimeZone systemTimeZone];
NSInteger sourceGMTOffset = [sourceTimeZone secondsFromGMTForDate:sourceDate];
NSInteger destinationGMTOffset = [destinationTimeZone secondsFromGMTForDate:sourceDate];
NSTimeInterval interval = destinationGMTOffset - sourceGMTOffset;
NSDate* destinationDate = [[NSDate alloc] initWithTimeInterval:interval sinceDate:sourceDate];
// Timestamp calculation (based on correction)
NSCalendar* currentCalendar = [NSCalendar currentCalendar];
NSCalendarUnit unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit;
NSDateComponents *differenceComponents = [currentCalendar components:unitFlags fromDate:destinationDate toDate:[NSDate date] options:0];
NSInteger yearDifference = [differenceComponents year];
NSInteger monthDifference = [differenceComponents month];
NSInteger dayDifference = [differenceComponents day];
NSInteger hourDifference = [differenceComponents hour];
NSInteger minuteDifference = [differenceComponents minute];
NSString* timestamp;
if (yearDifference == 0
&& monthDifference == 0
&& dayDifference == 0
&& hourDifference == 0
&& minuteDifference <= 2) {
//"Just Now"
timestamp = @"Just Now";
} else if (yearDifference == 0
&& monthDifference == 0
&& dayDifference == 0
&& hourDifference == 0
&& minuteDifference < 60) {
//"13 minutes ago"
timestamp = [NSString stringWithFormat:@"%ld minutes ago", (long)minuteDifference];
} else if (yearDifference == 0
&& monthDifference == 0
&& dayDifference == 0
&& hourDifference == 1) {
//"1 hour ago" EXACT
timestamp = @"1 hour ago";
} else if (yearDifference == 0
&& monthDifference == 0
&& dayDifference == 0
&& hourDifference < 24) {
timestamp = [NSString stringWithFormat:@"%ld hours ago", (long)hourDifference];
} else {
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setLocale:[NSLocale currentLocale]];
NSString* strDate, *strDate2 = @"";
if (yearDifference == 0
&& monthDifference == 0
&& dayDifference == 1) {
//"Yesterday at 10:23 AM", "Yesterday at 5:08 PM"
[formatter setDateFormat:@"hh:mm a"];
strDate = [formatter stringFromDate:destinationDate];
timestamp = [NSString stringWithFormat:@"Yesterday at %@", strDate];
} else if (yearDifference == 0
&& monthDifference == 0
&& dayDifference < 7) {
//"Tuesday at 7:13 PM"
[formatter setDateFormat:@"EEEE"];
strDate = [formatter stringFromDate:destinationDate];
[formatter setDateFormat:@"hh:mm a"];
strDate2 = [formatter stringFromDate:destinationDate];
timestamp = [NSString stringWithFormat:@"%@ at %@", strDate, strDate2];
} else if (yearDifference == 0) {
//"July 4 at 7:36 AM"
[formatter setDateFormat:@"MMMM d"];
strDate = [formatter stringFromDate:destinationDate];
[formatter setDateFormat:@"hh:mm a"];
strDate2 = [formatter stringFromDate:destinationDate];
timestamp = [NSString stringWithFormat:@"%@ at %@", strDate, strDate2];
} else {
//"March 24 2010 at 4:50 AM"
[formatter setDateFormat:@"d MMMM yyyy"];
strDate = [formatter stringFromDate:destinationDate];
[formatter setDateFormat:@"hh:mm a"];
strDate2 = [formatter stringFromDate:destinationDate];
timestamp = [NSString stringWithFormat:@"%@ at %@", strDate, strDate2];
}
}
return timestamp;
}
注：最初の数行はタイムゾーンオフセット補正用です。不要な場合はコメントアウトし、sourceDateが使用されている場合は常にdestinationDateを使用してください。
NSDateFormatter *dateFormat=[[NSDateFormatter alloc]init];
[dateFormat setDateFormat:@"MM"];
NSDate *todayDate = [NSDate date];
NSDate *yourJSONDate;
if ([[dateFormat stringFromDate:todayDate] integerValue]==[[dateFormat stringFromDate:yourJSONDate] integerValue]) {
//month is same
[dateFormat setDateFormat:@"dd"];
if ([[dateFormat stringFromDate:todayDate] integerValue]==[[dateFormat stringFromDate:yourJSONDate] integerValue]) {
//date is same
}
else{
//date differ
// now here you can check value for date
}
}
else{
//month differ
// now here you can check value for month
}
これを試して。同じまたは異なる値を取得したら、値を再度確認して文字列を作成できます。 ifループでは、他の回答を埋め込んだり、要件に応じてより具体的にしたりできます。
-(NSString *)getChatListFormatDate{ NSString *differencDate = @""; NSDate *lastSeenDate = self; NSDate *currentDate = [NSDate date]; NSString *timeDateStr = [self getStringFromDateFormat:@"hh:mm a"]; NSString *dayOfWeekString = [lastSeenDate getStringFromDateFormat:@"EEEE"]; NSCalendarUnit units = NSCalendarUnitDay | NSCalendarUnitWeekOfMonth | NSCalendarUnitWeekOfYear | NSCalendarUnitMonth | NSCalendarUnitYear; NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian]; NSDateComponents *calendarLastSeen = [calendar components:units fromDate:lastSeenDate]; NSDateComponents *calendarToday = [calendar components:units fromDate:currentDate]; BOOL isThisYear = calendarLastSeen.year == calendarToday.year; BOOL isThisMonth = calendarLastSeen.month == calendarToday.month; BOOL isThisWeekOfMonth = calendarLastSeen.weekOfMonth == calendarToday.weekOfMonth; NSInteger dayDiff = calendarToday.day - calendarLastSeen.day; if (isThisYear && isThisMonth && dayDiff == 0) { differencDate = timeDateStr;//Today } else if (isThisYear && isThisMonth && dayDiff == 1){ differencDate = @"Yesterday"; } else if (isThisYear && isThisMonth && isThisWeekOfMonth){ differencDate = dayOfWeekString;//apply Date } else { NSString *strDate = [self getStringFromDateFormat:@"d/MM/yy"]; differencDate = strDate; } return differencDate; }.