Changes time string to Time

What does this MR do and why?

Changes the time value to Time object instead of String so that it can be written into InfluxDB successfully.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.