Android uses "ye standard" timezone file format, but instead of using
a directory + file structure as libc uses, they throw everything into
two files, a "zoneinfo.dat" and a "zoneinfo.idx", where "zoneinfo.dat"
is the concatenation of all the TZIF files and "zoneinfo.idx" contains
the timezone names and offsets into "zoneinfo.dat". From the
However, to conserve disk space the data for all time zones
are concatenated into a single file, and a second file is
used to indicate the starting position of each time zone
record. A third file indicates the version of the zoneinfo
databse used to generate the data.
TimeZoneInfo.Android.cs is a C# port of the corresponding Android
ZoneInfoDB type so that Mono can use Android's timezone DB.