protected DateTimeOffset?FromRelationAmountTime(string relation, int amount, string size, DateTimeOffset relativeBaseTime, bool isUpperLimit)
{
relation = relation.ToLower();
size = size.ToLower();
if (amount < 1)
{
throw new ArgumentException("Time amount can't be 0.");
}
TimeSpan intervalSpan = Helper.GetTimeSpanFromName(size);
if (intervalSpan != TimeSpan.Zero)
{
var totalSpan = TimeSpan.FromTicks(intervalSpan.Ticks * amount);
switch (relation)
{
case "ago":
return(isUpperLimit ? relativeBaseTime.SafeSubtract(totalSpan).Ceiling(intervalSpan).SubtractMilliseconds(1) : relativeBaseTime.SafeSubtract(totalSpan).Floor(intervalSpan));
case "from now":
return(isUpperLimit ? relativeBaseTime.SafeAdd(totalSpan).Ceiling(intervalSpan).SubtractMilliseconds(1) : relativeBaseTime.SafeAdd(totalSpan).Floor(intervalSpan));
}
}
else if (size == "week" || size == "weeks")
{
switch (relation)
{
case "ago":
return(isUpperLimit ? relativeBaseTime.SubtractWeeks(amount).EndOfDay() : relativeBaseTime.SubtractWeeks(amount).StartOfDay());
case "from now":
return(isUpperLimit ? relativeBaseTime.AddWeeks(amount).EndOfDay() : relativeBaseTime.AddWeeks(amount).StartOfDay());
}
}
else if (size == "month" || size == "months")
{
switch (relation)
{
case "ago":
return(isUpperLimit ? relativeBaseTime.SubtractMonths(amount).EndOfDay() : relativeBaseTime.SubtractMonths(amount).StartOfDay());
case "from now":
return(isUpperLimit ? relativeBaseTime.AddMonths(amount).EndOfDay() : relativeBaseTime.AddMonths(amount).StartOfDay());
}
}
else if (size == "year" || size == "years")
{
switch (relation)
{
case "ago":
return(isUpperLimit ? relativeBaseTime.SubtractYears(amount).EndOfDay() : relativeBaseTime.SubtractYears(amount).StartOfDay());
case "from now":
return(isUpperLimit ? relativeBaseTime.AddYears(amount).EndOfDay() : relativeBaseTime.AddYears(amount).StartOfDay());
}
}
return(null);
}
public void AddWeeks()
{
var date = new DateTimeOffset(2013, 7, 26, 0, 0, 0, DateTimeOffset.Now.Offset);
Assert.AreEqual(new DateTimeOffset(2013, 8, 9, 0, 0, 0, DateTimeOffset.Now.Offset), date.AddWeeks(2));
Assert.AreEqual(new DateTimeOffset(2013, 7, 12, 0, 0, 0, DateTimeOffset.Now.Offset), date.AddWeeks(-2));
}
public static DateTimeOffset NextWeek(this DateTimeOffset date)
{
return(date.AddWeeks(1));
}
public static DateTimeOffset SubtractWeeks(this DateTimeOffset dateTimeOffset, double weeks)
{
return(dateTimeOffset.AddWeeks(-weeks));
}
