Detailed explanation of the example of C# implementing formatted output of date and time

DateTime is placed under the System namespace, and it does not have to use it directly in the top-level statement.

Single letter formatting

The most commonly used attribute of DateTime is Now, which represents the current time and its data type is also DateTime. But generally speaking, Now contains a lot of content. The more appropriate usage is to format and output it through some keywords. These keywords can be single letters, as shown in the following example

string[] formatLst = new string[] { "d", "D", "f", "F", "g", "G", "t", "T", "u", "U", "m", "M", "r", "R", "y", "Y", "o", "O", "s" };
foreach (var item in formatLst)
{
    var now = ;
    ($"{item}|{(item)}");
}

in,UIndicates the long date and time of the prime meridian.

Custom formatting

ToStringMore complex formatting methods are also overloaded

string[] fmtLst = new string[] { "yy", "yyyy", "MM", "dd", "ddd", "dddd", "hh", "HH", "mm", "ss", "ff", "fff", "ffff"};
foreach (var item in fmtLst)
{
    var now = ;
    ($"{item}|{(item)}");
}

The above keywords for a single year, month, day, hour, minute, and second can be freely combined by inserting other symbols, for example

var dt1 = ("yyyy-MM-dd HH:mm:");
var dt2 = ("yyyy/MM/dd HH:mm:ss");
var dt3 = ("Yyyy MM month ddddd");
(dt1);
(dt2);
(dt3);

The command line output is

2023-03-03 15:50:20.8885
2023/03/03 15:50:20
Friday, March 3, 2023

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