Issue #2921810 by claudiu.cristea, nod_, seanB, yogeshmpawar, dww, Wilfred...

Issue #2921810 by claudiu.cristea, nod_, seanB, yogeshmpawar, dww, Wilfred Waltman, joelpittet, askibinski, ankithashetty, ravi.shankar, jonathanshaw, alexpott, kostyashupenko, webchick, danflanagan8, catch, droplet, larowlan, mpdonadio, jhedstrom, AaronMcHale, dawehner, Wim Leers, ckrina, worldlinemine: Allow TimestampFormatter to show as a fully cacheable time difference with JS