Time: August 28th, 2013 8:45 AM CST
Frequency: Once (during maintenance?)
World name: Goblin
Character name: Kenaf Pureblade
NPC name: N/A
Monster name: N/A
Class/Level: N/A
Party or solo: Solo
In-game time:
Area and coordinates: N/A
Steps:
1. The prior day, I completed all of the supply missions for my Grand Company.
2. Supply missions reset at 5:00 AM.
3. Maintenance occurred during this time.
4. Logged back in at 8:45 AM and found no available supply missions, and the next refresh is tomorrow (8/29) at 5:00 AM (in 20 hours).

I believe there is an issue where these timers don't activate during server downtime.