֮ʱ

DateDiff(interval, date1, date2 [,firstdayofweek[, firstweekofyear]])
DateDiff ﷨²


interval 
ѡַʽʾڼ date1  date2 ֮ʱйֵġá֡ 
date1, date2 
ѡڱʽڼڡ 
Firstdayofweek 
ѡָеһĳûָĬΪաйֵġá֡ 
Firstweekofyear 
ѡָһеһܵĳûָĬΪ 1  1 ڵڡйֵġá֡ 

interval ֵ

  
yyyy  
q  
n  
y һ 
d  
w һܵ 
ww  
h Сʱ 
m  
s  

firstdayofweek ֵ

 ֵ  
vbUseSystemDayOfWeek 0 ʹ֧ (NLS) API á 
vbSunday 1 գĬϣ 
vbMonday 2 һ 
vbTuesday 3 ڶ 
vbWednesday 4  
vbThursday 5  
vbFriday 6  
vbSaturday 7  

firstweekofyear ֵ

 ֵ  
vbUseSystem 0 ʹ֧ (NLS) API á 
vbFirstJan1 1  1  1 ڵڿʼĬϣ 
vbFirstFourDays 2 ĵһܿʼ 
vbFirstFullWeek 3 µһеһܿʼ 

˵
DateDiff ж֮ڵָʱĿʹ DateDiff ߵ쵽һ֮

Ҫ date1  date2 ʹáһyաd interval ΪһܵwʱDateDiff ֮ date1 һ DateDiff 㵽 date2 ֮ǰһĿ˽ date2  date1 interval ǡܡww DateDiff ֮ date1  date2 ֮յĿ date2 գDateDiff  date2ʹ date1 գҲ date1

 date1  date2 DateDiff ظ

firstdayofweek ʹáw͡wwŵļӰ졣

 date1  date2 ָ֣ȻΪڵĹ̶֡ date1  date2  (" ") вʡݣڴÿμ date1  date2 ʽʱ뵱ǰݡͿԱдڲͬݵĳ롣

 interval ΪꡱyyyyʱȽ 12  31 պ 1  1 գȻʵֻһ죬DateDiff  1 ʾһݡ

ʾ DateDiff ʾ֮: 

Function DiffADate(theDate)
   DiffADate = "ӵ쿪ʼ:" & DateDiff("d", Now, theDate)
End Function
