Apps Script JDBC reads DATETIME with wrong timezone - google-apps-script

Question

I'm trying to read from a DATETIME field in MySQL using the Apps Script JDBC service. The database has its timezone set to UTC (##global.time_zone == ##session.time_zone == '+00:00'), and I've double-checked this by doing SELECT UNIX_TIMESTAMP(COL) FROM TABLE. My script is also set to use UTC.
However, when I read the value from the JDBC result set using getTimestamp, it is skewed forwards by 8 hours. This occurs regardless of whether I pass a timezone to getTimestamp (indeed, there is no change whatsoever, regardless of what timezone I pass), and regardless of whether useJDBCCompliantTimeZoneShift is enabled or not.
If I read the result using getString, it gives the correct time (in UTC). Barring using getString and parsing it into a JavaScript Date, how can I fix this issue?
Edit
Here's a testing script I used, and its output:
export function tzTest(): void {
const dbIp = DB_IP
const dbPw = DB_PW
let conn = Jdbc.getConnection(`jdbc:mysql://${dbIp}/mydb`, { user: "myuser", password: dbPw })
let stmt = conn.prepareStatement("SELECT COL FROM MYTABLE WHERE OWNER_ID=1")
stmt.execute()
let res = stmt.getResultSet()
res.next()
console.log("==== DEFAULT ====")
console.log("=== getTimestamp ===")
console.log(`plain: ${new Date(res.getTimestamp(1).getTime())} (${res.getTimestamp(1).getTime()})`)
console.log(`utc: ${new Date(res.getTimestamp(1, "UTC").getTime())} (${res.getTimestamp(1, "UTC").getTime()})`)
console.log("=== getTime ===")
console.log(`plain: ${new Date(res.getTime(1).getTime())} (${res.getTime(1).getTime()})`)
console.log(`utc: ${new Date(res.getTime(1, "UTC").getTime())} (${res.getTime(1, "UTC").getTime()})`)
console.log("=== getDate ===")
console.log(`plain: ${new Date(res.getDate(1).getTime())} (${res.getDate(1).getTime()})`)
console.log(`utc: ${new Date(res.getDate(1, "UTC").getTime())} (${res.getDate(1, "UTC").getTime()})`)
conn.close()
conn = Jdbc.getConnection(`jdbc:mysql://${dbIp}/mydb`, { user: "myuser", password: dbPw, useJDBCCompliantTimeZoneShift: true })
stmt = conn.prepareStatement("SELECT COL FROM MYTABLE WHERE OWNER_ID=1")
stmt.execute()
res = stmt.getResultSet()
res.next()
console.log("==== useJDBCCompliantTimeZoneShift ====")
console.log("=== getTimestamp ===")
console.log(`plain: ${new Date(res.getTimestamp(1).getTime())} (${res.getTimestamp(1).getTime()})`)
console.log(`utc: ${new Date(res.getTimestamp(1, "UTC").getTime())} (${res.getTimestamp(1, "UTC").getTime()})`)
console.log("=== getTime ===")
console.log(`plain: ${new Date(res.getTime(1).getTime())} (${res.getTime(1).getTime()})`)
console.log(`utc: ${new Date(res.getTime(1, "UTC").getTime())} (${res.getTime(1, "UTC").getTime()})`)
console.log("=== getDate ===")
console.log(`plain: ${new Date(res.getDate(1).getTime())} (${res.getDate(1).getTime()})`)
console.log(`utc: ${new Date(res.getDate(1, "UTC").getTime())} (${res.getDate(1, "UTC").getTime()})`)
conn.close()
}
This results in the following output:
==== DEFAULT ====
=== getTimestamp ===
plain: Sat Dec 21 2019 15:39:17 GMT+0000 (Coordinated Universal Time) (1576942757000)
utc: Sat Dec 21 2019 15:39:17 GMT+0000 (Coordinated Universal Time) (1576942757000)
=== getTime ===
plain: Thu Jan 01 1970 15:39:17 GMT+0000 (Coordinated Universal Time) (56357000)
utc: Thu Jan 01 1970 15:39:17 GMT+0000 (Coordinated Universal Time) (56357000)
=== getDate ===
plain: Sat Dec 21 2019 08:00:00 GMT+0000 (Coordinated Universal Time) (1576915200000)
utc: Sat Dec 21 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (1576886400000)
==== useJDBCCompliantTimeZoneShift ====
=== getTimestamp ===
plain: Sat Dec 21 2019 15:39:17 GMT+0000 (Coordinated Universal Time) (1576942757000)
utc: Sat Dec 21 2019 15:39:17 GMT+0000 (Coordinated Universal Time) (1576942757000)
=== getTime ===
plain: Thu Jan 01 1970 15:39:17 GMT+0000 (Coordinated Universal Time) (56357000)
utc: Thu Jan 01 1970 15:39:17 GMT+0000 (Coordinated Universal Time) (56357000)
=== getDate ===
plain: Sat Dec 21 2019 08:00:00 GMT+0000 (Coordinated Universal Time) (1576915200000)
utc: Sat Dec 21 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (1576886400000)
For comparison, SELECT COL,(UNIX_TIMESTAMP(COL) * 1000) FROM MYTABLE WHERE OWNER_ID=1 gives 2019-12-21 07:39:17 and 1576913957000.

Answer 1

This issue seems to be a bug in the past and should already be fixed.
Including useJDBCCompliantTimezoneShift=true in the connection parameter should fix the issue to interpret the timezone correctly.
Noting here that the timezone shown when converting a JavaScript Date to a string will always be the timezone of the server (in this case UTC) that's why your workaround fixed it.