Add support for timestamp encoding in exemplars #3

Job	Run time
Clippy	1m 17s
Check	1m 43s
Rustfmt	17s
Test Suite	1m 59s
Check rustdoc intra-doc links	30s
Cross compile (powerpc-unknown-linux-gnu)	19s
Cross compile (armv7-unknown-linux-gnueabihf)	18s
Cross compile (wasm32-unknown-unknown)	20s
Cross compile (powerpc64-unknown-linux-gnu)	20s
	7m 3s

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