When do Muslims keep siyaam or fasts?
at the month of ramadan all , from salah al fajr "before sun
rise " to salah al majreb "before sun set" this is must for every
but some days are option for siyaam like every Monday and
thursday and 13,14,15
for every day at the month "hegry" , "moon month" , arafat day
but not at hajj ,
10 of moharam .