我正在寻找一种区分时间跨度的方法,例如,在上午8点到9点到晚上8点到晚上9点,上午10点到12点,晚上10点到12点等等。
由于时间是相对的,我正在寻找一种创造性的方法来实现这一目标。
这是我到目前为止所尝试的内容:
// 3:41pm - 4:41pm
DateStart: 5/7/2015 3:41:41 PM
DateExpire: 5/7/2015 4:41:41 PM
DateExpire.Subtract(DateStart): 01:00:00
ToUnixEpocTime(DateStart): 1431013301
ToUnixEpocTime(DateExpire): 1431016901
int timespan = ToUnixEpocTime(DateExpire) - ToUnixEpocTime(DateStart);
timespan: 3600
// 4:41pm - 5:41pm
DateStart: 5/7/2015 4:41:41 PM
DateExpire: 5/7/2015 5:41:41 PM
DateExpire.Subtract(DateStart): 01:00:00
ToUnixEpocTime(DateStart): 1431016901
ToUnixEpocTime(DateExpire): 1431020501
int timespan = ToUnixEpocTime(DateExpire) - ToUnixEpocTime(DateStart);
timespan: 3600
......我不确定为什么这些结果让我感到惊讶,因为它们才有意义 - 因为它只是基本的减法。
答案 0 :(得分:2)
如前所述,TimeSpan是时间间隔。时间间隔上午8点到9点和下午8点到晚上9点是完全相同的 - 它是1小时。如果你想区分它们,那么创建你自己的类,它将保存每个间隔的开始和结束时间,并使用这些值来比较对象:
public class DateRange
{
public DateRange(DateTime start, DateTime end)
{
if (end < start)
throw new ArgumentException("end");
Start = start;
End = end;
}
public DateTime Start { get; private set; }
public DateTime End { get; private set; }
public TimeSpan Duration { get { return End - Start; }}
public override bool Equals(object obj)
{
DateRange other = obj as DateRange;
if (other == null)
return false;
return Start == other.Start && End == other.End;
}
// override GetHashCode
}
现在,如果您有两个日期范围
var morningRange = new DateRange(8amTime, 9amTime);
var eveningRange = new DateRange(8pmTime, 9pmTime);
它们不会相同,但持续时间会相同
morningRange.Duration == eveningRange.Duration // true
morningRange.Equals(eveningRange) // false
您还可以定义==
和!=
运算符
public static bool operator== (DateRange x, DateRange y)
{
if (Object.ReferenceEquals(x, y))
return true;
if (((object)x == null) || ((object)y == null))
return false;
return x.Equals(y);
}
public static bool operator !=(DateRange x, DateRange y)
{
return !(x == y);
}
现在比较更容易
morningRange == eveningRange // false
morningRange != eveningRange // true
答案 1 :(得分:0)
我的解决方案:
public class TimeRange
{
private double _begin; // total ms from 00:00
private double _end; // total ms from 00:00
/// <param name="begin"> begin time (for example 8:30:15am) </param>
/// <param name="end"> begin time (for example 12pm) </param>
public TimeRange(DateTime begin, DateTime end)
{
_begin = begin.TimeOfDay.TotalMilliseconds;
_end = end.TimeOfDay.TotalMilliseconds;
}
/// <summary>
/// check time in range
/// </summary>
/// <param name="time"> time </param>
/// <returns></returns>
public bool IsDateInRange(DateTime time)
{
double value = time.TimeOfDay.TotalMilliseconds;
return _end > _begin ? (value >= _begin && value <= _end) : (value >= _end && value <= _begin);
}
public override string ToString()
{
DateTime today = DateTime.Today;
return string.Format(_end > _begin ? "{0}-{1}" : "{1}-{0}",
(today + TimeSpan.FromMilliseconds(_begin)).ToString("HH:mm"),
(today + TimeSpan.FromMilliseconds(_end)).ToString("HH:mm"));
}
}
用法:
TimeRange range = new TimeRange(DateTime.Today, DateTime.Now);
Console.WriteLine("Range is {0}", range.ToString());
for (int i = 0; i < 24; i++)
{
Console.WriteLine("Time {0:00}:00 is in range? {1}", i, range.IsDateInRange(DateTime.Today.AddHours(i)));
}
输出:
Range is 00:00-17:45
Time 00:00 is in range? True
Time 01:00 is in range? True
Time 02:00 is in range? True
Time 03:00 is in range? True
Time 04:00 is in range? True
Time 05:00 is in range? True
Time 06:00 is in range? True
Time 07:00 is in range? True
Time 08:00 is in range? True
Time 09:00 is in range? True
Time 10:00 is in range? True
Time 11:00 is in range? True
Time 12:00 is in range? True
Time 13:00 is in range? True
Time 14:00 is in range? True
Time 15:00 is in range? True
Time 16:00 is in range? True
Time 17:00 is in range? True
Time 18:00 is in range? False
Time 19:00 is in range? False
Time 20:00 is in range? False
Time 21:00 is in range? False
Time 22:00 is in range? False
Time 23:00 is in range? False
答案 2 :(得分:0)
只是给出一个想法
如果两者都是AM或PM那么
添加12个时差
否则
只是减去
// 3:41 pm - 4:41 pm
DateStart:5/7/2015 3:41:41 PM
DateExpire:5/7/2015 4:41:41 PM
if(DateStart = PM和DateExpire = PM)
timeSpan =(DateStart - DateExpire)+ 12
否则
timeSpan =(DateStart - DateExpire)