Hello
I didn't change anything in calendar code. I have only changed localization parameters.
Localization Parameters (System):
SiteWideLocale: es_ES
SystemTimezone: America/New_York
sePackageLevelLocalesP: 0 (I don't remember if I changed this)
In user:
Your Preferred Locale: Spanish (ES)
Your Timezone: Europe/Madrid
Remember than problem is than events has 6 hours of difference (system: GMT-5, me GMT+1)
Thanks for your attention and readyness.
Cesareo