Head over to time-rs.github.io/format-converter to use this. It will convert a formatting string that was valid in time v0.1 to one that has the same behavior in v0.2.
Differences that this tool cannot account for:
%Zhas been removed entirely. As it only handledGMTandUTC,GMTwill be output.%zcould previously parse offsets containing a colon, but does not in v0.2.
All other formatting strings should work identically after being converted.