DateTime格式字符串模式

Question

Could someone please guide me on the correct format string to display a time in the following format?

   Original: #7/28/2011 09:00:03 AM#
   Required Format: 9am

   //BUT if the minutes part contains a value I want it to look like this

   Original: #7/28/2011 09:21:03 AM#
   Required Format: 9:21am

Is there one format string I can use to accomplish this?

PS: I have tried h:mmtt but as expected that doesnt quite give me what I want

Answer 1

Format strings won't help. You want to conditionally format the string based on a value. You will have to check the minutes value yourself and apply the appropriate format string based on whether there are 0 minutes or not.

DateTime dateValue = DateTime.Parse("7/28/2011 09:00:03 AM");
string formattedString;
if (dateValue.Minute == 0)
    formattedString = dateValue.ToString(@"M/d/yyyy Htt");
else
    formattedString = dateValue.ToString(@"M/d/yyyy H:mmtt");

Answer 2

你需要编写逻辑来规定00条件，每当你找到00作为分钟然后只返回小时值，否则返回小时和分钟值

dtobj.Minute.Equals(00) ? dtobj.ToString("dd/MM/yy hhtt") : dtobj.ToString("dd/MM/yy hh:mmtt")

Answer 3

try~

string str = "7/28/2011 09:21:03 AM";
DateTime dt = DateTime.ParseExact(str, "M/dd/yyyy HH:mm:ss tt",CultureInfo.InvariantCulture);
Console.WriteLine(dt.Minute == 0 ? dt.ToString("HHtt"):dt.ToString("HH:mmtt"));