...
The API descriptions can be found on https://data.gov.sg For For rainfall: https://beta.data.gov.sg/dataset/realtime-weather-readings?resource_id=8bd37e06-cdd7-4ca4-9ad8-5754eb70a33ddatasets/d_72ef872af64a49bbf85c037e714267c0/view
Data can only be requested one day at at time, for example: https://api.data.gov.sg/v1/environment/rainfall?date=2018-07-26
...
The parser always uses standard singapore time so there is no need to use include a <importTimeZone> element to configure this specific timezone..