How to possibly fix your Android apps refusing to sync or repeated security certificate errors

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This video will show you a possible solution to the issue of your Android applications refusing to update or sync (such as the GMail app for example), or your POP3, IMAP, SMTP or Exchange E-Mail application reporting:

Couldn’t Finish
Can’t safely connect to server. (com.android.org.bouncycastle.jce.exception. ExtCertPathValidatorException: Could not validate certificate: current time: Mon Jan 07 03:19:58 AST 1980, validation time: Sun Feb 07 20:00:00 AST 2010)

As well as your web browser application continually and repeatedly showing the following error for each and every HTTPS website that you visit:

Security warning
There are problems with the security certificate for this site.
Go back
View certificate
Continue

Security certificate
This certificate isn’t from a trusted authority.
Issued to:
Common name:
www.yahoo.com
Organization:
Yahoo! Inc.
Organizational unit:
Information Technology
Serial number:
21:AE:43:46:66:50:D5:B3:7D:BD:41:2C:A6:E0:27:E9
Issued by:
Common name:
VeriSign Class 3 Secure Server CA – G3
Organization:
VeriSign, Inc.
Organizational unit:
VeriSign Trust Network
Validity:
Issued on:
2014-05-05
Expires on:
2014-05-23
Fingerprints:
SHA-256 fingerprint:
C2:35:B8:70:CA:56:EE:12:EC:D6:E6:94:F5:60:1C:82:79:92:EC:46:EC:78:9F:A0:0C:64:97:9A:1E:0A:1A:1D
SHA-1 fingerprint:
39:73:57:6D:71:DE:8B:97:76:F3:AD:A7:48:70:20:E2:C5:1E:C6:4B

Source: Youtube