On all three devices I am using Exchange ActiveSync to sync Calendar and Tasks for my work email account.
I have no issues with Calendar items. Items I create on any device are synced complete with correct reminder time.
I created one task on each device with a reminder for 12PM. Items created on Android or PC have their reminders wrong on the iPhone but display correctly on the respective devices. All three devices have the same time zone settings. I checked my Outlook.com account and the time zone is also correct.
So I am stumped. Have you experienced this issue?
Apple iPhone 5S iOS 7.0.6 (11B651)
Time zone = Manila
ACER 4740G Windows 7 Home Premium 64-bit - all updates installed
Outlook 2013 (Office 365 subscription)
Time zone = UTC+8 (which is Manila)
Samsung GT-S7582 Android 4.2.2
Time zone = GMT+8:00, Philippine Time