date-range

I have the following problem: Events have a "begin" and "end" time and an amount. I use MySQL DATETIME for both. Now if I have a constraint that says "no overlapping events" I need to make some checks etc. but how to design that? The user only needs 5-mins precision or so, but i want to do calculations with seconds since that is "simpler"/"cleaner" If I have an event (A) with start-end "YYYY-MM-DD 12:00:00"-"YYYY-MM-DD 14:00:00" and another (B) "YYYY-MM-DD 14:00:00"-"YYYY-MM-DD 16:15:00" -> they are non-overlapping even though they both contain 14:00:00. In order to determine that they are

This question already has an answer here: how to get a list of dates between two dates in java 21 answers I attempted to generate the date range between date x and date y but failed. I have the same method in c# so I tried to modify it as much as I can but failed to get result. Any idea what I could fix? private ArrayList<Date> GetDateRange(Date start, Date end) { if(start.before(end)) { return null; } int MILLIS_IN_DAY = 1000 * 60 * 60 * 24; ArrayList<Date> listTemp = new ArrayList<Date>(); Date tmpDate = start; do { listTemp.add(tmpDate); tmpDate = tmpDate.getTime() + MILLIS_IN_DAY; } while

In C# 3.0, how do I get the seconds since 1/1/2010? MadBoy Goes like this: TimeSpan test = DateTime.Now - new DateTime(2010, 01, 01); MessageBox.Show(test.TotalSeconds.ToString()); For one liner fun: MessageBox.Show((DateTime.Now - new DateTime(2010, 01, 01)) .TotalSeconds.ToString()); You can substract 2 DateTime instances and get a TimeSpan: DateTime date = new DateTime(2010,1,1); TimeSpan diff = DateTime.Now - date; double seconds = diff.TotalSeconds; Just to avoid timezone issues TimeSpan t = (DateTime.UtcNow - new DateTime(2010, 1, 1)); int timestamp = (int) t.TotalSeconds; Console

I am trying to implement an IEqualityComparer that has a tolerance on a date comparison. I have also looked into this question . The problem is that I can't use a workaround because I am using the IEqualityComparer in a LINQ .GroupJoin() . I have tried a few implementations that allow for tolerance. I can get the Equals() to work because I have both objects but I can't figure out how to implement GetHashCode() . My best attempt looks something like this: public class ThingWithDateComparer : IEqualityComparer<IThingWithDate> { private readonly int _daysToAdd; public ThingWithDateComparer(int

Consider two tables: Transactions , with amounts in a foreign currency: Date Amount ========= ======= 1/2/2009 1500 2/4/2009 2300 3/15/2009 300 4/17/2009 2200 etc. ExchangeRates , with the value of the primary currency (let's say dollars) in the foreign currency: Date Rate ========= ======= 2/1/2009 40.1 3/1/2009 41.0 4/1/2009 38.5 5/1/2009 42.7 etc. Exchange rates can be entered for arbitrary dates - the user could enter them on a daily basis, weekly basis, monthly basis, or at irregular intervals. In order to translate the foreign amounts to dollars, I need to respect these rules: A. If

I created a date range picker using jquery ui where you can use the same inline calendar to make both of your date selections. See my fiddle here: http://jsfiddle.net/kVsbq/4/ JS $(".datepicker").datepicker({ minDate: 0, numberOfMonths: [12, 1], beforeShowDay: function (date) { var date1 = $.datepicker.parseDate($.datepicker._defaults.dateFormat, $("#input1").val()); var date2 = $.datepicker.parseDate($.datepicker._defaults.dateFormat, $("#input2").val()); return [true, date1 && ((date.getTime() == date1.getTime()) || (date2 && date >= date1 && date <= date2)) ? "dp-highlight" : ""]; },