Daylight saving time by country 1992 Colombian energy crisis "Time zone changes and daylight saving time start/end dates between year 1990 and 1999 - Bogota, Colombia". timeanddate.com.
Θερινή ώρα ανά χώρα Κολομβιανή ενεργειακή κρίση (1992) «Time zone changes and daylight saving time start/end dates between year 1990 and 1999 - Bogota, Colombia». timeanddate.com.