1. Dart
2. dart:io
3. X509Certificate
4. startValidity property

##### X509Certificate class

1. Properties
2. der
3. endValidity
4. hashCode
5. issuer
6. pem
7. runtimeType
8. sha1
9. startValidity
10. subject
11. Methods
12. noSuchMethod
13. toString
14. Operators
15. operator ==

description

# startValidity property Null safety

DateTime startValidity

## Implementation

    DateTime get startValidity;