iOS：将 UTC NSDate 转换为本地时区
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iOS: Convert UTC NSDate to local Timezone
提问by slf
How do I convert a UTC NSDateto local timezone NSDate in Objective C or/and Swift?
如何NSDate在 Objective C 或/和 Swift 中将UTC 转换为本地时区 NSDate？
回答by slf
NSTimeInterval seconds; // assume this exists
NSDate* ts_utc = [NSDate dateWithTimeIntervalSince1970:seconds];
NSDateFormatter* df_utc = [[[NSDateFormatter alloc] init] autorelease];
[df_utc setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]];
[df_utc setDateFormat:@"yyyy.MM.dd G 'at' HH:mm:ss zzz"];
NSDateFormatter* df_local = [[[NSDateFormatter alloc] init] autorelease];
[df_local setTimeZone:[NSTimeZone timeZoneWithName:@"EST"]];
[df_local setDateFormat:@"yyyy.MM.dd G 'at' HH:mm:ss zzz"];
NSString* ts_utc_string = [df_utc stringFromDate:ts_utc];
NSString* ts_local_string = [df_local stringFromDate:ts_utc];
// you can also use NSDateFormatter dateFromString to go the opposite way
Table of formatting string parameters:
格式化字符串参数表：
https://waracle.com/iphone-nsdateformatter-date-formatting-table/
https://waracle.com/iphone-nsdateformatter-date-formatting-table/
If performance is a priority, you may want to consider using strftime
如果性能是优先考虑的，您可能需要考虑使用 strftime
回答by gyozo kudor
EDITWhen i wrote this I didn't know I should use a dateformatter which is probably a better approach, so check out slf's answer too.
编辑当我写这篇文章时，我不知道我应该使用 dateformatter 这可能是一种更好的方法，所以也请查看slf's answer。
I have a webservice that returns dates in UTC. I use toLocalTimeto convert it to local time and toGlobalTimeto convert back if needed.
我有一个以 UTC 返回日期的网络服务。我toLocalTime用来将其转换为当地时间，并toGlobalTime在需要时转换回来。
This is where I got my answer from:
这是我从这里得到答案的地方：
https://agilewarrior.wordpress.com/2012/06/27/how-to-convert-nsdate-to-different-time-zones/
https://agilewarrior.wordpress.com/2012/06/27/how-to-convert-nsdate-to-different-time-zones/
@implementation NSDate(Utils)
-(NSDate *) toLocalTime
{
NSTimeZone *tz = [NSTimeZone defaultTimeZone];
NSInteger seconds = [tz secondsFromGMTForDate: self];
return [NSDate dateWithTimeInterval: seconds sinceDate: self];
}
-(NSDate *) toGlobalTime
{
NSTimeZone *tz = [NSTimeZone defaultTimeZone];
NSInteger seconds = -[tz secondsFromGMTForDate: self];
return [NSDate dateWithTimeInterval: seconds sinceDate: self];
}
@end
回答by Sendoa
The easiest method I've found is this:
我发现的最简单的方法是这样的：
NSDate *someDateInUTC = …;
NSTimeInterval timeZoneSeconds = [[NSTimeZone localTimeZone] secondsFromGMT];
NSDate *dateInLocalTimezone = [someDateInUTC dateByAddingTimeInterval:timeZoneSeconds];
回答by Krunal
Swift 3+: UTC to Local and Local to UTC
Swift 3+：UTC 到本地和本地到 UTC
extension Date {
// Convert UTC (or GMT) to local time
func toLocalTime() -> Date {
let timezone = TimeZone.current
let seconds = TimeInterval(timezone.secondsFromGMT(for: self))
return Date(timeInterval: seconds, since: self)
}
// Convert local time to UTC (or GMT)
func toGlobalTime() -> Date {
let timezone = TimeZone.current
let seconds = -TimeInterval(timezone.secondsFromGMT(for: self))
return Date(timeInterval: seconds, since: self)
}
}
回答by Mohd Iftekhar Qurashi
If you want local Date and time. Try this code:-
如果您想要本地日期和时间。试试这个代码：-
NSString *localDate = [NSDateFormatter localizedStringFromDate:[NSDate date] dateStyle:NSDateFormatterMediumStyle timeStyle:NSDateFormatterMediumStyle];
回答by Vvk
Convert your UTC date to Local Date
将您的 UTC 日期转换为本地日期
-(NSString *)getLocalDateTimeFromUTC:(NSString *)strDate
{
NSDateFormatter *dtFormat = [[NSDateFormatter alloc] init];
[dtFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
[dtFormat setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
NSDate *aDate = [dtFormat dateFromString:strDate];
[dtFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
[dtFormat setTimeZone:[NSTimeZone systemTimeZone]];
return [dtFormat stringFromDate:aDate];
}
Use Like This
像这样使用
NSString *localDate = [self getLocalDateTimeFromUTC:@"yourUTCDate"];
回答by Ashwin Kumar
Here input is a string currentUTCTime (in format 08/30/2012 11:11) converts input time in GMT to system set zone time
这里输入的是一个字符串 currentUTCTime（格式为 08/30/2012 11:11）将输入的 GMT 时间转换为系统设置的时区时间
//UTC time
NSDateFormatter *utcDateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[utcDateFormatter setDateFormat:@"MM/dd/yyyy HH:mm"];
[utcDateFormatter setTimeZone :[NSTimeZone timeZoneForSecondsFromGMT: 0]];
// utc format
NSDate *dateInUTC = [utcDateFormatter dateFromString: currentUTCTime];
// offset second
NSInteger seconds = [[NSTimeZone systemTimeZone] secondsFromGMT];
// format it and send
NSDateFormatter *localDateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[localDateFormatter setDateFormat:@"MM/dd/yyyy HH:mm"];
[localDateFormatter setTimeZone :[NSTimeZone timeZoneForSecondsFromGMT: seconds]];
// formatted string
NSString *localDate = [localDateFormatter stringFromDate: dateInUTC];
return localDate;
回答by Linh Nguyen
//This is basic way to get time of any GMT time.
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"hh:mm a"]; // 09:30 AM
[formatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:1]]; // For GMT+1
NSString *time = [formatter stringFromDate:[NSDate date]]; // Current time
回答by Linh Nguyen
Convert the datefrom the UTC calendar to one with the appropriate local NSTimeZone.
将日期从 UTC 日历转换为具有适当本地NSTimeZone 的日期。
回答by imjaydeep
I write this Method to convert date time to our LocalTimeZone
我编写此方法将日期时间转换为我们的 LocalTimeZone
-Here (NSString *)TimeZone parameter is a server timezone
- 这里 (NSString *)TimeZone 参数是服务器时区
-(NSString *)convertTimeIntoLocal:(NSString *)defaultTime :(NSString *)TimeZone
{
NSDateFormatter *serverFormatter = [[NSDateFormatter alloc] init];
[serverFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:TimeZone]];
[serverFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *theDate = [serverFormatter dateFromString:defaultTime];
NSDateFormatter *userFormatter = [[NSDateFormatter alloc] init];
[userFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
[userFormatter setTimeZone:[NSTimeZone localTimeZone]];
NSString *dateConverted = [userFormatter stringFromDate:theDate];
return dateConverted;
}
