Make tests pass after 2020 #13061

Make tests pass after 2020 and also test that 64 bit integers are properly handled

Without this patch, the failure was

unknown location(0): fatal error: in "rpc_tests/rpc_ban": std::runtime_error: JSON value is not an object as expected
test/rpc_tests.cpp(260): last checkpoint

I found this when testing reproducible builds for openSUSE Linux packages, building 15 years from now (this is the expected lifespan of today's software)

There is 1 other issue in ./src/qt/test/paymentservertests.cpp that fails to verify a cert that expires in 2022 after 10y.

QWARN  : PaymentServerTests::paymentServerTests() PaymentRequestPlus::getMerchant: Payment request: certificate expired or not yet active:  QSslCertificate("3", "01", "Ipbt+DxK8RDQd25/5ueXqw==", (), ("Payment Request Test Merchant"), QMap(), QDateTime(2012-12-10 16:37:24.000 UTC Qt::TimeSpec(UTC)), QDateTime(2022-12-08 16:37:24.000 UTC Qt::TimeSpec(UTC)))
FAIL!  : PaymentServerTests::paymentServerTests() Compared values are not the same

Thanks. utACK 3ee4be10500710fc8e9b03acf974fd81224c05c4

With the mention that it would be possible to avoid having this issue again forever (though 2283 is pretty much that) by using GetTime()+2y or so, or setting a mock time.

Very nice catch! Excellent first-time contribution! Hope to see more contributions from you.

May I ask how you found this issue?

utACK 3ee4be10500710fc8e9b03acf974fd81224c05c4

utACK 3ee4be10500710fc8e9b03acf974fd81224c05c4

@practicalswift I use the rbk script from https://github.com/bmwiedemann/reproducibleopensuse that invokes openSUSE's osc build with an option to pass -rtc base=$later to kvm. Alternatively one could just alter the host system clock.