Buscar fecha específica en la semana actual

Question

¿Cómo podría obtener la fecha del jueves de la semana en curso? Por ejemplo, el jueves de esta semana actual es 7/8/2010

Answer 1

Usted puede hacer esto (alebit torpemente) con el .NET DateTime existente. El truco es usar la enumeración DayOfWeek como un número entero, ya que denota los días Sol - Sáb en orden numérico ascendente (0-6).

DateTime someDay = DateTime.Today; 
var daysTillThursday = (int)someDay.DayOfWeek - (int)DayOfWeek.Thursday; 
var thursday = someDay.AddDays(daysTillThursday); 

O aún más simple:

var today = DateTime.Today; 
var thursday = today.AddDays(-(int)today.DayOfWeek).AddDays(4); 

Answer 2

Salida esta biblioteca: http://datetimeextensions.codeplex.com/

partir de los ejemplos en la página principal:

DateTime nextFriday = DateTime.Now.Next(DayOfWeek.Friday); 

Answer 3

private static DateTime GetDayOfWeek(DayOfWeek dayOfWeek) 
{ 
    var date = DateTime.Now; 
    if (date.DayOfWeek != dayOfWeek) 
    { 
     var direction = date.DayOfWeek > dayOfWeek ? -1D : 1D; 
     do 
     { 
      date = date.AddDays(direction); 
     } while (date.DayOfWeek != dayOfWeek); 
    } 
    return date; 
} 

Answer 4

Pseudo código para encontrar más cercana Jueves:

for 0 to 3 as x 
    if today + x days is Thursday 
     return (today + x days) 
    if today - x days is Thursday 
     return (today - x days) 

pseudo código para encontrar el jueves de esta semana:

lookForward = true 
lookBackward = true 
FirstDayOfTheWeek = Sunday 

for 0 to 6 as x 
    if today + x days is FirstDayOfTheWeek 
     lookForward = false 
    if today - x days is FirstDayOfTheWeek 
     lookBackward = false 
    if lookForward and today + x days is Thursday 
     return (today + x days) 
    if lookBackward and today - x days is Thursday 
     return (today - x days) 

Lo sentimos, no hablo C# :)

Answer 5

DateTime.Today.AddDays(-(int)DateTime.Today.DayOfWeek).AddDays(4) 

Answer 6

// This is fixed... 
int thursday = 4; 

int difference = thursday - (int)DateTime.Now.DayOfWeek; 

DateTime thursdayThisWeek = DateTime.Now.Date.AddDays(difference);