C# 日期格式化工具类型扩展

public static class DateTimeFormatUtils
{
	private static DateTime Jan1st1970 = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
 
	private static CultureInfo CurrentCulture => Thread.CurrentThread.CurrentCulture;
 
	private static CultureInfo InvariantCulture => CultureInfo.InvariantCulture;
 
	public static DateTime ToDateTime(string str)
	{
		return DateTime.Parse(str, CurrentCulture.DateTimeFormat);
	}
 
	public static DateTime ToDateTime(string str, DateTimeStyles dateTimeStyle)
	{
		return DateTime.Parse(str, CurrentCulture.DateTimeFormat, dateTimeStyle);
	}
 
	public static DateTime ToDateTime(string str, string format)
	{
		return DateTime.ParseExact(str, format, CurrentCulture.DateTimeFormat);
	}
 
	public static DateTime ToDateTime(string str, string format, DateTimeStyles dateTimeStyle)
	{
		return DateTime.ParseExact(str, format, CurrentCulture.DateTimeFormat, dateTimeStyle);
	}
 
	public static string ToString(DateTime dateTime)
	{
		return dateTime.ToString(CurrentCulture.DateTimeFormat);
	}
 
	public static string ToString(DateTime dateTime, string format)
	{
		return dateTime.ToString(format, CurrentCulture.DateTimeFormat);
	}
 
	public static string ToLongDateTimeString(DateTime dateTime)
	{
		return ToString(DateTime.Now, "F");
	}
 
	public static string ToLongDateString(DateTime dateTime)
	{
		return ToString(DateTime.Now, "D");
	}
 
	public static string ToLongTimeString(DateTime dateTime)
	{
		return ToString(DateTime.Now, "T");
	}
 
	public static string ToKSQlFormat(this DateTime dateTime)
	{
		return "{ts'" + dateTime.ToString("yyyy-MM-dd HH:mm:ss") + "'}";
	}
 
	public static bool IsValidDate(this DateTime dateTime)
	{
		if (dateTime.IsNullOrEmpty())
		{
			return false;
		}
		if (dateTime == DateTime.MinValue)
		{
			return false;
		}
		if (dateTime.ToString("yyyy-MM-dd") == "1900-01-01")
		{
			return false;
		}
		return true;
	}
 
	public static DateTime BeginDateTimeOfDay(this DateTime dateTime)
	{
		return Convert.ToDateTime(dateTime.ToString("yyyy-MM-dd") + " 00:00:00");
	}
 
	public static DateTime EndDateTimeOfDay(this DateTime dateTime)
	{
		return Convert.ToDateTime(dateTime.ToString("yyyy-MM-dd") + " 23:59:59");
	}
 
	public static long CurrentTimeMillis()
	{
		return (long)(DateTime.UtcNow - Jan1st1970).TotalMilliseconds;
	}
 
	public static long GetTimestamp(this DateTime dt)
	{
		return CurrentTimeMillis() / 1000;
	}
}