Laravel overflow when updating value

The problem I encountered was I have a column named "timeStart" to store the unix epoch time in millisecond. When I was updating through Laravel update function, the value stored in database shows that it's negative instead of the value I wanted it to store.

e.g. value intended to store: 1540090500000 value stored in database: -1802759264

I'm using bigint datatype here. The same code works on my localhost database but not when I uploaded it onto my shared hosting server, which is a weird issue. What can be done to address this issue?

via Chebli Mohamed