Just for further clarification, the API works like this:

• time is the local (client) time (in this case UTC-7)
• servertimezone is the time zone where the server is located
• timezoneoffset is the offset of the local time relative to the servertimezone (offset from the servers PoV)

To get the UTC date you have to do something like this:

time.minusHours(timezoneoffset).atZone(servertimezone).toUTC()