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获取当前日期月份的第一天/最后一天日期
获取当前日期是周几
OC写法
//获取日期date对应月的第一天日期
+ (NSString *)getMonthFirstDayWithDate:(NSDate *)date format:(NSString *)aformat;
//获取日期date对应月的最后一天日期
+ (NSString *)getMonthLastDayWithDate:(NSDate *)date format:(NSString *)aformat;
//获取对应日期是周几
+ (NSInteger)getWeekDayFromDate:(NSDate *)date;
+ (NSString *)getMonthFirstDayWithDate:(NSDate *)date format:(NSString *)aformat{
NSDate *newDate = date;
double interval = 0;
NSDate *firstDate = nil;
NSCalendar *calendar = [NSCalendar currentCalendar];
BOOL bl = [calendar rangeOfUnit:NSCalendarUnitMonth startDate:& firstDate interval:&interval forDate:newDate];
if (bl) {
NSDateFormatter *myDateFormatter = [[NSDateFormatter alloc] init];
[myDateFormatter setDateFormat:aformat];
NSString *firstString = [myDateFormatter stringFromDate: firstDate];
return firstString;
}
return @"";
}
+ (NSString *)getMonthLastDayWithDate:(NSDate *)date format:(NSString *)aformat{
NSDate *newDate = date;
double interval = 0;
NSDate *firstDate = nil;
NSDate *lastDate = nil;
NSCalendar *calendar = [NSCalendar currentCalendar];
BOOL bl = [calendar rangeOfUnit:NSCalendarUnitMonth startDate:& firstDate interval:&interval forDate:newDate];
if (bl) {
lastDate = [firstDate dateByAddingTimeInterval:interval - 1];
NSDateFormatter *myDateFormatter = [[NSDateFormatter alloc] init];
[myDateFormatter setDateFormat:aformat];
NSString *lastString = [myDateFormatter stringFromDate: lastDate];
return lastString;
}
return @"";
}
+ (NSInteger)getWeekDayFromDate:(NSDate *)date{
NSArray *tempWeek = @[@"7",@"1",@"2",@"3",@"4",@"5",@"6"];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *comps = [[NSDateComponents alloc] init];
NSInteger unitFlags = NSCalendarUnitYear |NSCalendarUnitMonth | NSCalendarUnitDay |NSCalendarUnitWeekday | NSCalendarUnitHour |NSCalendarUnitMinute |NSCalendarUnitSecond;
comps = [calendar components:unitFlags fromDate:date];
// 1、2、3、4、5、6、7 分别对应 周日、周一、周二、周三、周四、周五、周六
NSInteger week = [comps weekday];
NSLog(@"---%ld",week);
// 调整后 1 代表 周一
return [tempWeek[week-1] integerValue] ;
}
Swift 写法
struct DateRange {
var startDate : String
var endDate : String
init(startDate:String? ,endDate:String?) {
self.startDate = startDate ?? ""
self.endDate = endDate ?? ""
}
}
获取某月的第一天 和 最后一天
/// 获取某月的第一天 和 最后一天
/// - parameter date: 时间，默认当前时间
/// - parameter interval: 间隔 。默认为0
/// - parameter format: 日期格式
///
/// - 间隔传入 1 即为传入日期的下一个月 ，-1 上一个月
class func firstDay_LastDayOfMounth(date : Date = Date() ,interval: Int = 0, format: String = "yyyy-MM-dd") -> DateRange {
let newDate = date
let ca = Calendar.init(identifier: .gregorian)
var lastMonthComps = DateComponents()
lastMonthComps.month = interval
let curDate = ca.date(byAdding: lastMonthComps, to: newDate)
var interval:Double = 0
var firstDate:Date = Date()
var lastDate :Date = Date()
let calendar = NSCalendar.current
let bl = calendar.dateInterval(of: .month, start: &firstDate, interval: &interval, for: curDate!)
if bl {
lastDate = firstDate.addingTimeInterval(interval-1)
}
let firstStr = ZLDateTimeTool.stringFromDate(date: firstDate, format: format)
let lastStr = ZLDateTimeTool.stringFromDate(date: lastDate, format: format)
let range = DateRange.init(startDate: firstStr, endDate: lastStr)
return range
}
返回对应日期是周几
/// - 返回对应日期是周几
class func getWeekDayByDate(date:Date) -> Int{
guard let calendar = NSCalendar(identifier: NSCalendar.Identifier.gregorian) else {
return 1
}
let components = calendar.components([.weekOfYear,.weekOfMonth,.weekday,.weekdayOrdinal], from: date)
/*
//今年的第几周
let weekOfYear = components.weekOfYear!
//这个月第几周
let weekOfMonth = components.weekOfMonth!
//这个月第几周
let weekdayOrdinal = components.weekdayOrdinal!*/
//周几
let weekday = components.weekday!
//调整前 1、2、3、4、5、6、7 分别对应 周日、周一、周二、周三、周四、周五、周六
let cnWeekday = [7, 1, 2, 3, 4, 5, 6]
//调整后 1、2、3、4、5、6、7 分别对应 周一、周二、周三、周四、周五、周六、周日
return cnWeekday[weekday-1]
}
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