1.Localtime转化为UTC时间
end_time = pytz.UTC.normalize(end_time)
2.从无时区的datetime转换成有时区的(转化后的时间= 原时间 + 时区)
context_tz = pytz.timezone(tz_name)
context_tz.localize(planned_time_no_zone)
end_time = pytz.UTC.normalize(end_time)
context_tz = pytz.timezone(tz_name)
context_tz.localize(planned_time_no_zone)