解析多种格式的日期时间

您应该考虑要求时区。1不需要它，但是＃2和＃3需要它。

public DateTime ParseRequestDate()
{
// https://stackoverflow.com/questions/2883576/how-do-you-convert-epoch-time-in-c
CultureInfo enUS = new CultureInfo("en-US");
var dt = "1374755180";
//var dt = "7/25/2013 6:37:31 PM";
//var dt = "2013-07-25 14:26:00";
DateTime dateValue;
long dtLong;
// Scenario #1
if (long.TryParse(dt, out dtLong))
return dtLong.FromUnixTime();
// Scenario #2
if (DateTime.TryParseExact(dt, "MM/dd/yyyy hh:mm:ss tt", enUS, DateTimeStyles.None, out dateValue))
return dateValue;
// Scenario #3
if (DateTime.TryParseExact(dt, "yyyy-MM-dd hh:mm:ss", enUS, DateTimeStyles.None, out dateValue))
return dateValue;
throw new SomeException("Don't know how to parse...");
}


正如Matt Johnson指出的那样，DateTime.TryParseExact接受一个格式字符串数组。2＆3可能会凝聚。

public DateTime ParseRequestDate()
{
// https://stackoverflow.com/questions/2883576/how-do-you-convert-epoch-time-in-c
CultureInfo enUS = new CultureInfo("en-US");
var dt = "1374755180";
//var dt = "7/25/2013 6:37:31 PM";
//var dt = "2013-07-25 14:26:00";
DateTime dateValue;
long dtLong;
// Scenario #1
if (long.TryParse(dt, out dtLong))
return dtLong.FromUnixTime();
// Scenario #2 & #3
var formatStrings = new string[] { "MM/dd/yyyy hh:mm:ss tt", "yyyy-MM-dd hh:mm:ss" };
if (DateTime.TryParseExact(dt, formatStrings, enUS, DateTimeStyles.None, out dateValue))
return dateValue;
throw new SomeException("Don't know how to parse...");
}


我从另一个问题借来的时代转换。 （扩展方法）

public static class MyExtensions
{
public static DateTime FromUnixTime(this long unixTime)
{
var epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
return epoch.AddSeconds(unixTime);
}
}