DateTime.AddDays(7) vs Calendar.AddWeeks(1)

Question

Can both methods deliver different results under certain circumstances? Same question for negative values...

You might find this helpful: http://stackoverflow.com/questions/4793788/datetime-adddays-vs-calendar-adddays — DKnight, Feb 22 '11 at 13:58

score 2 · Answer 1 · answered Feb 22 '11 at 13:59

2

They always do the same thing. AddMonth and AddYears will vary but a week is always 7 days

answered Feb 22 '11 at 13:59

Robert Levy

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score 2 · Accepted Answer · answered Feb 22 '11 at 13:59

Straight from Reflector:

public DateTime AddDays(double value)
{
    return this.Add(value, 86400000);
}

public virtual DateTime AddWeeks(DateTime time, int weeks)
{
    return this.AddDays(time, weeks * 7);
}

Note, however, that AddWeeks is defined as virtual.

DateTime.AddDays(7) vs Calendar.AddWeeks(1)

2 Answers2