C# / .NET Tips: C# DateTime Format String

Standard Format String

d: 12/30/2008
D: Tuesday, December 30, 2008
f: Tuesday, December 30, 2008 5:53 PM
F: Tuesday, December 30, 2008 5:53:15 PM
g: 12/30/2008 5:53 PM
G: 12/30/2008 5:53:15 PM
m: December 30
o: 2008-12-30T17:53:15.0932357-05:00
R: Tue, 30 Dec 2008 17:53:15 GMT
s: 2008-12-30T17:53:15
t: 5:53 PM
T: 5:53:15 PM
u: 2008-12-30 17:53:15Z
U: Tuesday, December 30, 2008 10:53:15 PM
y: December, 2008

Custom Format String

Year
%y: 8
yy: 08
yyy: 2008
yyyy: 2008

Month
%M: 12
MM: 12
MMM: Dec
MMMM: December

Day
%d: 30
dd: 30
ddd: Tue
dddd: Tuesday

Hour
%h: 5
hh: 05
hhh: 05
hhhh: 05
%H: 17
HH: 17
HHH: 17
HHHH: 17

Minute
%m: 53
mm: 53
mmm: 53
mmmm: 53
Second
%s: 15
ss: 15
sss: 15
ssss: 15

Millisecond
%f: 0
ff: 09
fff: 093
ffff: 0932
%F:
FF: 09
FFF: 093
FFFF: 0932

Kind
%K: -05:00
KK: -05:00-05:00
KKK: -05:00-05:00-05:00
KKKK: -05:00-05:00-05:00-05:00

TimeZone
%z: -5
zz: -05
zzz: -05:00
zzzz: -05:00

Other
%g: A.D.
gg: A.D.
ggg: A.D.
gggg: A.D.
%t: P
tt: PM
ttt: PM
tttt: PM
Standard Format string to Custom Format string mapping

Year Month Day Patterns
d: MM/dd/yyyy
D: dddd, dd MMMM yyyy
M or m: MMMM dd
Y or y: yyyy MMMM

Time Patterns
t: HH:mm
T: HH:mm:ss

Year Month Day and Time without Time Zones
f: dddd, dd MMMM yyyy HH:mm
F: dddd, dd MMMM yyyy HH:mm:ss
g: MM/dd/yyyy HH:mm
G: MM/dd/yyyy HH:mm:ss

Year Month Day and Time with Time Zones
o: yyyy'-'MM'-'dd'T'HH':'mm':'ss.fffffffK
R or r: ddd, dd MMM yyyy HH':'mm':'ss 'GMT'
s: yyyy'-'MM'-'dd'T'HH':'mm':'ss
u: yyyy'-'MM'-'dd HH':'mm':'ss'Z'
U: dddd, dd MMMM yyyy HH:mm:ss

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