Time

In MM6 the in-game date affects many things.

• Every month lasts 28 days (4 weeks), starts on a Monday and ends on a Sunday.
• A year is 336 days long.
• Full moon lasts from the 15th through the 17th every month.

Circus:

Blackshire          28th March through 27 April
Bootleg Bay         28th November through 27 December  TESTME
Mire of the Damned  28th Julythrough 27 August         TESTME

Shrines:

January     Might        Bootleg Bay
February    Intellect    Misty Islands
March       Personality  Silver Cove
April       Endurance    Frozen Highlands
May         Accuracy     Free Haven
June        Speed        Mire of the Damned
July        Luck         New Sorpigal
August      Fire         Kriegspire
September   Electricity  Castle Ironfist
October     Cold         Kriegspire
November    Poison       Eel Infested Waters
December    Magic        Blackshire

Deck of Fate:

Gives a stat/resist boost depending on month. (same month as for shrines)
The day of the month affects the amount and other effects as follows:
1st to 7th = +1 (5th stones you, 7th eradicates) 
8th to 14th = +2 (13th Dead) 
15th to 21st = +3 (no bad effects during this week) 
22nd to 28th = +4 (26th stoned, 27th Dead)