The exact start of my birthday depends on where will be at the time. It starts and ends at midnight in the current timezone. With some clever time zone jumping

The exact start of my birthday depends on where will be at the time. It starts and ends at midnight in the current timezone. With some clever time zone jumping my birthday could start twice or more in the same year. Also if I was born on February 29, you need to move it Feb 28 or March 1 on non-leap years.