Embedded extrinsic source for digital certificate validation

A computer system to validate a digital certificate, the computer system comprising:

• one or more processors, one or more computer-readable memories, one or more computer-readable tangible storage devices, and program instructions stored on at least one of the one or more storage devices for execution by at least one of the one or more processors via at least one of the one or more memories, the program instructions comprising:
• program instructions to receive a digital certificate including information defining a validity period and information specifying a first extrinsic source;
• program instructions to request a current date and time value from the first extrinsic source;
• program instructions to receive the current date and time value;
• program instructions to compare the current date and time value to the validity period of the digital certificate;
• and
• program instructions to determine if the current date and time value is within the digital certificate validity period.

A computer program product to validate a digital certificate, the computer program product comprising:

• one or more computer-readable storage devices and program instructions stored on at least one of the one or more tangible storage devices, the program instructions comprising:
• program instructions to receive a digital certificate including information defining a validity period and information specifying a first extrinsic source;
• program instructions to request a current date and time value from the first extrinsic source;
• program instructions to receive the current date and time value;
• program instructions to compare the current date and time value to the validity period of the digital certificate;
• and
• program instructions to determine if the current date and time value is within the validity period of the digital certificate.