Retrofit error time format hh:mm[:ss[.uuuuuu]] I have code for post request using retrofit2 @PartMap, but why is this value format always error to post? What is wrong? val open_time = HashMap() open_time["open_time[0]day"] =1 open_time["open_time[0]open_at"]= "13:00:00.000001" open_time["open_time[0]close_at"]= "14:00:00.000001" in the ApiService @PartMap open_time : HashMap error log : D/OkHttp: {"open_time":[{"open_at":["Time has wrong format. Use one of these formats instead: hh:mm[:ss[.uuuuuu]]."],"close_at":["Time has wrong...