Common iOS time methods

Common iOS time methods

// Date before the current day

NSDate * today = [NSDate date];

 

// Time Zone

NSTimeZone * zone = [NSTimeZone systemTimeZone];

 

// Set the interval

_ Interval = [zone secondsFromGMTForDate: today];

 

// Today + 8 hours (China Shanghai time zone)

Today = [today dateByAddingTimeInterval: _ interval];

 

// Obtain tomorrow's date

NSDate * tomorrowDate = [[NSDate alloc] initWithTimeInterval: 24*60*60 sinceDate: [NSDate date];

 

// Calendar

NSCalendar * calendar = [NSCalendar currentCalendar];

 

// Information such as time, year, month, and day can be separated from comps.

 

NSDateComponents * comps = [calendar components :( NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekCalendarUnit | NSWeekdayCalendarUnit | bytes | NSHourCalendarUnit) fromDate: tomorrowDate];

 

// Obtain the current day of the week

NSInteger weekday = [comps weekday];

 

// Convert the NSString type to NSDate

 

NSDate * serverDate = [dateFomatter dateFromString: serverTimeStr];

NSDate * createDate = [dateFomatter dateFromString: createTimeStr];

 

// Calculate the interval between two dates

NSTimeInterval betweenTime = [serverDate timeIntervalSinceDate: createDate];

// Separate the year, month, day, hour, minute, and second in the standard format

 

NSDateFormatter * dateFomatter = [[NSDateFormatter alloc] init];

[DateFomatter setDateFormat: @ "yyyy-MM-dd HH: mm: ss"];

 

// Replace string with formatter

NSDate * stringDate = [dateFomatter dateFromString: string];

 

// Formatter is month and day

[DateFomatter setDateFormat: @ "MM-dd"];

 

// Extract the string month and day

NSString * str1 = [dateFomatter stringFromDate: stringDate];