像excel一样将excel格式转换为C＃时间戳

Question

In my app I'm reading some data from excel sheet and i stucked in the moment when i want to get timestamp from a cell. In this speciffic cell i got a value '1900-01-02 13:20:04' and in excel i am using format '[h]:mm:ss' which formats this value to '61:20:04', which is correct beacuse those cells are showing hours worked by some employees. What I want to achieve is to read this data from excel in the same format as it's formated in excel('61:20:04') and save it to string. My problem is how to read this, or convert to this timestamp value ?

EDIT.(the way i am doing it now)

I am reading the code from excel using ODBC so just select data i need(like sQl select) -> add all data to datatable and then i'm just doing

dr["workedHours"].ToString() -(dr = DataRow in my DataTable.Rows) this line returns '1900-01-02 13:20:04'. How can I convert it to time like excel does.

Answer 1

Some proof of concept:

var timeStamp = "1900-01-02 13:20:04";
var date = DateTime.Parse(timeStamp);
var stamp = date.Subtract(new DateTime(1900, 1, 1));
var result = string.Format("{0}:{1:00}:{2:00}", 24 + stamp.Days * 24 + stamp.Hours, stamp.Minutes, stamp.Seconds);

It seems for some reason Excel takes time stamps from 0 January 1900, this is why I add 24 in hours result.

I assumed you always want format hh:mm:ss, even for days, month, etc.

Answer 2

Without any code provided Ill go away from 'how to read data the right way' and point to 'how to convert your output'.

Could work like this:

string[] stampParts = output.ToString().Split(' ');
string[] dateParts = stampParts[0].Split('-');
string[] timeParts = stampParts[1].Split(':');

var result = new TimeSpan(((Convert.ToInt32(dateParts[2])-1)*24) + Convert.ToInt32(timeParts[0]), Convert.ToInt32(timeParts[1]), Convert.ToInt32(timeParts[2]));

This would add the days from the date with 24 hours by a single one to the hours of your time.
Notice: I left out calculating the months here. So this code is limited in calculation up one month. If you want to output larger numbers (over about 720 hours) the months have to be included into the calculation.

Edit after code was provided:
Sorry, I havnt worked with odbc-connections before. But the point is: You are getting the raw-value instead of the calculated one. I already tried googling for that, but couldnt find much results.

Maybe someone else can help out with this. Instead I would suggest just converting the output.