Mismo - this explanation is spot on!
@ ramcal - follow what ad123464 advised. Also, note departure and arrival times are normally given in the local time. So your departure in Manila is given in local (Philippine Standard Time) and your arrival is given in Vancouver (Pacific Standard Time) local time.
I queried PR 116 which is the flight that corresponds to your ETD and ETA.
Manila (MNL) to Vancouver (YVR) -
Philippine Airlines, Inc. Philippine Airlines, Inc. 116 Dep: 7:00PM Arr: 4:00PM 12h 0m Boeing 777
Your flight time is 12hrs as I highlighted in red.
Here is a site for time conversion between time zones. http://www.timeanddate.com/
Don't worry, masasanay ka din - sa lawak ng Canada, there are 6 different time zones
/...atb