DateTime represent how many bit in C#

Question

Int, Float, Double, Decimal, DateTime .etc are value types. And I know:

Int:Represents a 32-bit signed integer.
Float:Represents a single-precision floating-point number(32-bit).
Double:Represents a double-precision floating-point number(64-bit).
...

But how many bit for DateTime? And why all value types in .NET are struct?

Answer 1

Based on here, DateTime represents 64-bit in C#:

Prior to the .NET Framework version 2.0, the DateTime structure contains a 64-bit field composed of an unused 2-bit field concatenated with a private Ticks field, which is a 62-bit unsigned field that contains the number of ticks that represent the date and time. The value of the Ticks field can be obtained with the Ticks property.

Starting with the .NET Framework 2.0, the DateTime structure contains a 64-bit field composed of a private Kind field concatenated with the Ticks field. The Kind field is a 2-bit field that indicates whether the DateTime structure represents a local time, a Coordinated Universal Time (UTC), or the time in an unspecified time zone. The Kind field is used when performing time conversions between time zones, but not for time comparisons or arithmetic. The value of the Kind field can be obtained with the Kind property.