UTC+07:20 is an identifier for a time offset from UTC of +07:20.
Usage
UTC+07:20 was used as daylight saving time in Singapore between 1933 and 1941. On midnight January 1st, 1933, people in Singapore switched from UTC+07:00 to UTC+07:20 when clocks were turned forward 20 minutes. This time was used till midnight of September 1st, 1941 when UTC+07:30 started to be used.
References
UTC+07:20 Wikipedia(Text) CC BY-SA