Date code:  
There are 3 different date code format on our relays: 
1) Three digit code: The first digit represents the year and the remaining two digits represent the week number in a 
calendar year, e.g. 451 means week 51 of year 2004. 
2) Four digit code: The first two digits represent the year and the remaining two digits represent the week number in 
a calendar year, e.g. 0451 means week 51 of year 2004. 
3) Five digits code: The first digit represents the year. The second two digits represent the month and the remaining 
two digits represent the day, e.g. 41201 means Dec. 1, 2004