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标题: Python处理日期方法大全、三十种方法 [打印本页]

作者: 2744557306    时间: 2024-3-22 11:30
标题: Python处理日期方法大全、三十种方法
使用 time 模块展示当前日期和时间0 M" ]; ^' g3 U
import time
* v* p* W! C0 R' V% _from time import gmtime, strftime
' `  |9 C3 E% t$ y/ d, H* a/ C  c
t = time.localtime()  % r% m9 Y+ ~! ]9 e8 ^. ]( t$ Z
print (time.asctime(t))  # Sun May 7 09:30:37 20179 P- k, D! H" A% e; F
print(strftime("%a, %d %b %Y %H:%M:%S +0000", gmtime()))  # Sun, 07 May 2017 04:00:37 +0000& A) {( S6 m. W9 L
print(strftime("%A", gmtime()))  # Sunday9 [8 q% N, d! ~8 C, ]7 e; q
print(strftime("%D", gmtime()))  # 05/07/17
) p, @! X1 w  t2 d7 D: N' Q0 H9 Zprint(strftime("%B", gmtime()))  # May
& |+ ~. K% g2 aprint(strftime("%y", gmtime()))  # 17
" v  o" z4 w) O4 s) i( A  B: C' N% R/ @( }- x
# Convert seconds into GMT date
7 Q7 N, L$ G: S+ B; P, Z0 _- d9 y5 oprint(strftime("%a, %d %b %Y %H:%M:%S +0000", gmtime(1234567890)))  # Fri, 13 Feb 2009 23:31:30 +00008 `( l6 g8 N$ H  l/ Q

% H3 s8 g1 Y; L  R0 ]2 I' N. b  g二、将天、小时、分钟转换为秒& E2 D% v2 A: t4 I
SECONDS_PER_MINUTE = 60
, P4 d: U1 I5 c& ]! c  x$ O. dSECONDS_PER_HOUR = 3600
, u( _% Y+ a+ jSECONDS_PER_DAY = 86400: ~- O! z; u  t# b( @

: k: b; j, L* w+ r/ s# 输入天、小时、分钟、秒的数量
6 r3 c0 F7 x, ?/ ndays = int(input("Enter number of Days: "))$ H1 ^3 ?2 A2 x5 f! m
hours = int(input("Enter number of Hours: "))
% Y7 J( z$ M" a- Iminutes = int(input("Enter number of Minutes: ")): i! e4 a0 Z* J% |
seconds = int(input("Enter number of Seconds: "))1 F8 A/ ^! r* w: R( H) X3 t
5 j3 k  O; F" {+ a7 t7 }
# 计算! [. S: f5 A- A9 Y: F" w
total_seconds = days * SECONDS_PER_DAY
: s7 g; b/ U7 o% z1 _total_seconds = total_seconds + ( hours * SECONDS_PER_HOUR)
0 ?4 p* a* [4 j7 X! H: [total_seconds = total_seconds + ( minutes * SECONDS_PER_MINUTE)- {' O, p5 ~/ z! Q' W; I% p8 Y
total_seconds = total_seconds + seconds
# [0 n2 p7 a: {% `' V3 L9 V/ x
) Q% E/ N5 o& T: ?# 结果% c& G3 a, w, ~0 l5 r
print("Total number of seconds: ","%d"%(total_seconds))
" a; S3 W  D& i, }'''" B# j3 o& s! V  h
Enter number of Days: 5+ v5 X8 X; ?. Y+ d2 E0 M
Enter number of Hours: 36
# U% C. }! [: e/ F* v0 S: hEnter number of Minutes: 245 o2 h  T4 b& P& q# Y
Enter number of Seconds: 158 s* R. T, S5 w$ K7 V
Total number of seconds: 563055# I' A! k8 k5 H/ B
'''
+ N( A+ B6 @5 x1 y- @5 H3 [- Y3 e( p8 T
三、使用 Pandas 获取当前日期和时间
/ H5 Y2 A% f$ q9 yimport pandas as pd
3 O* A# D  W/ \; Lprint(pd.datetime.now())  # 2018-01-19 16:08:28.393553
. Y( u/ Z* R8 P# n$ n; |; R2 _print(pd.datetime.now().date())  # 2018-01-19; Y) G: r$ G) f$ A9 K2 V
print(pd.datetime.now().year)  # 2018
1 V" ?# R' x( P6 J3 k' N- wprint(pd.datetime.now().month)  # 1
( J! F6 {; x0 a- \7 ~' M8 eprint(pd.datetime.now().day)  # 19& q& ~, O/ v: O- t
print(pd.datetime.now().hour)  # 16$ e9 t( x) T  Z* n
print(pd.datetime.now().minute)  # 8
/ R! O5 r; H/ F3 D" t" Hprint(pd.datetime.now().second)  # 28$ m, K( {2 L! m
print(pd.datetime.now().microsecond)  # 394553- M- r+ @( E3 R  ~

! g4 b, U7 x$ `( F. O四、将字符串转换为日期时间对象
: E/ F  {/ X" S& Xfrom datetime import datetime
. \7 n7 G9 @6 I! Zfrom dateutil import parser
% p% u/ Z; ?: Z; ~' ?1 @9 `6 g& R, Q2 I( B
d1 = "Jan 7 2015  1:15PM"3 r) [# N. t( k
d2 = "2015 Jan 7  1:33PM"! v2 @5 [) U1 p1 y: R" @
/ i3 W; a- J9 r$ X$ ~) h6 A' L
# If you know date format
7 ^3 `1 N1 J; }; M) m7 ?# `date1 = datetime.strptime(d1, '%b %d %Y %I:%M%p')+ N  e/ u: `9 f- x0 j8 S( Z
print(type(date1))  # class 'datetime.datetime'
+ P9 d$ h' o& Q6 M* Tprint(date1)  # 2015-01-07 13:15:00
) L' Y- d" J9 q" y
  e% C0 i7 w- S9 Z% X# If you don't know date format5 [, ?  V/ e5 g- c2 ?
date2 = parser.parse(d2)( @# A/ F4 B9 ^
print(type(date2))  # class 'datetime.datetime'
% n  `' U+ X  [* F' g$ fprint(date2)  # 2015-01-07 13:33:00
- d; J5 m- h) m1 _% `0 S6 ^  i8 Z, @
) P& ]! o0 t3 ?8 L2 h5 G3 M五、以毫秒为单位获取当前时间( y9 l$ T" t  [; x1 }$ T" R
import time
; c/ D1 N2 C/ f, B# n6 u- p& {' i1 x3 r
milliseconds = int(round(time.time() * 1000))
' b$ j( \) H  ]$ |# |8 x! R0 a& Wprint(milliseconds)  # 15163642706501 M1 |1 Y! E3 L! F/ w! Q7 ^. |5 k

  O9 L: @4 ~' ^: V; p六、以 MST、EST、UTC、GMT 和 HST 获取当前日期时间
* T" N7 i# ?4 f- t0 k- Sfrom datetime import datetime$ n7 ~1 z/ D6 W! s# q8 @
from pytz import timezone) V, U1 U2 [) L9 T* r
! I8 @) ~9 z2 F. l8 ~5 c: x
mst = timezone('MST')* n1 }' R! ~+ |
print("Time in MST:", datetime.now(mst))  # Time in MST: 2017-01-19 06:06:14.495605-07:006 J: O! ?. _' w, M
est = timezone('EST')6 N1 q5 W6 ^5 v: X! K6 |! U5 d7 I* c
print("Time in EST:", datetime.now(est))  # Time in EST: 2017-01-19 08:06:14.496606-05:00
- ?6 c& N1 j, F1 A( x1 `utc = timezone('UTC')7 O1 Q8 m3 R. g8 q4 I
print("Time in UTC:", datetime.now(utc))  # Time in UTC: 2017-01-19 13:06:14.496606+00:00
( I+ p( X2 A1 G/ i& sgmt = timezone('GMT')
& C5 a# E, d+ r* {7 Jprint("Time in GMT:", datetime.now(gmt))  # Time in GMT: 2017-01-19 13:06:14.496606+00:00- r2 R2 H( F' D0 n
hst = timezone('HST')# u8 y# f/ J0 y! R  q
print("Time in HST:", datetime.now(hst))  # Time in HST: 2017-01-19 03:06:14.497606-10:00  q" M5 O6 v4 X* ]  c
  ]6 V" x0 K$ C% ^% |  R: f
七、从给定的日期当中获取星期几+ v) _- L4 r3 Q0 f2 z( Q
import datetime. r6 R9 B3 r3 F# @. K6 J( s, P: i

1 {) m" y; b; H% Z0 Z) Q- n3 Bdayofweek = datetime.date(2010, 6, 16).strftime("%A"). _  X7 C+ e  ~* C7 d5 O: D' u& V
print(dayofweek)  # Wednesday; k2 C# n+ E; l0 L
  g1 e! y4 e1 `" F
# weekday()方法: 0代表周一,6代表周日
8 A# r4 L6 z5 }print("weekday():", datetime.date(2010, 6, 16).weekday())  # weekday(): 2
' h( n8 y8 y/ K$ l# l& S4 g" |& h* [( {( [: w0 d4 H
# isoweekday() 方法: 1代表周一,7代表周日
0 z: n% `; m: ~8 z4 X: E; pprint("isoweekday()", datetime.date(2010, 6, 16).isoweekday())  # isoweekday() 3
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4 }0 }2 \# o- O, Fdayofweek = datetime.datetime.today().strftime("%A")- a+ L; n+ G, j2 v  R' l( U
print(dayofweek)  # Friday5 p' I& \, w: q1 Q# [0 |
print("weekday():", datetime.datetime.today().weekday())  # weekday(): 4
; ^% _$ `6 h3 X3 z$ bprint("isoweekday()", datetime.datetime.today().isoweekday())  # isoweekday(): 5' L0 C( [* H* K; h6 Z, c
( T5 D/ @5 v4 x3 W. v" g# G# @) @
八、计算两个日期时间对象之间的时差6 k6 _- m) u- [$ M3 z. g5 [5 x
import datetime1 y8 l0 L7 ^$ A5 u9 S4 y6 A7 R
from datetime import timedelta
0 ~9 s9 D/ L+ V2 t- g% @( Y+ \  G0 f
datetimeFormat = '%Y-%m-%d %H:%M:%S.%f'
% m6 \' d' w: W! l1 u$ I: |- jdate1 = '2016-04-16 10:01:28.585'9 A  q* N/ z2 N7 k$ D
date2 = '2016-03-10 09:56:28.067'
& \2 O3 ?7 H9 O8 \diff = datetime.datetime.strptime(date1, datetimeFormat)\
& x7 Q( [+ }$ G1 M6 D/ p# d3 v    - datetime.datetime.strptime(date2, datetimeFormat)" A- i$ v' H* H" D0 r( m( F4 Q
7 t' X0 ]4 K" ^4 k! B
print("Difference:", diff)  # Difference: 37 days, 0:05:00.518000* I( b- z4 V# @; L
print("Days:", diff.days)  # Days: 37
% v! @; r. i" q9 Q* P" c& K' x6 r, Iprint("Microseconds:", diff.microseconds)  # Microseconds: 518000: l- i8 [! @; N9 F( {( Q$ z$ ?
print("Seconds:", diff.seconds)  # Seconds: 300
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0 O2 Z0 Z7 n1 A# e4 k! b九、将 5 分钟添加到 Unix 时间戳. S% T3 L' y1 \4 T. H
import datetime0 Q' m& S; K7 Z, U% x  U
import calendar+ E0 t! Q1 w0 q, k' U2 R9 D

, L0 N6 o6 v: g5 i/ ifuture = datetime.datetime.utcnow() + datetime.timedelta(minutes=5)1 b8 F9 ?# o: g' p! y1 ]$ |
print(calendar.timegm(future.timetuple()))  # 1621069619) \" H) V# q; m5 O. ~. L( \" I

# F4 {- a1 q0 J  r6 J) d十、遍历一系列日期
- u0 S) d& o1 J) ^, d: M( i% Q+ P, vimport datetime4 H. u( m! l' j, I" W* E0 U
; @& I$ S9 r$ m1 `( q: Y
start = datetime.datetime.strptime("21-06-2020", "%d-%m-%Y")
8 p* f, @6 O: X2 [' z/ r+ aend = datetime.datetime.strptime("05-07-2020", "%d-%m-%Y")
& H( O6 s  B! Z, f" }2 J/ d9 bdate_generated = [start + datetime.timedelta(days=x) for x in range(0, (end - start).days)]
; x8 n+ E$ I- P6 Y: F
% n! M7 ]5 y# k& E9 k( \6 ?& Qfor date in date_generated:# V  n. I$ j. B: v* v
    print(date.strftime("%d-%m-%Y"))
" e% ^7 _6 O* S- G8 V3 |! i5 P0 `3 W% {* t
十一、巴黎时间更改为纽约时间
  k& H' W' b$ a+ N( v) Y, M7 w" timport pendulum
. Y, }8 A* J: y, z: n7 l( ~8 N: @3 ]
+ g/ X, C7 F0 ?! ~. X5 H7 nin_paris = pendulum.datetime(2016, 8, 7, 22, 24, 30, tz='Europe/Paris')
7 j( w, `1 {4 B0 J6 ?" [print(in_paris)  # 2016-08-07T22:24:30+02:00
: w; ]% Y8 N% {4 t9 n' ^( o6 M
$ K% v, b% I* u4 e+ \8 Win_us = in_paris.in_timezone('America/New_York')& v" h5 [  B! H6 |; R
print(in_us)  # 2016-08-07T16:24:30-04:00
8 j; c& b; k- ]' P
$ V) k: e! x% L十二、使用 Python 获得最后7个工作日
' K& v0 D# y: t$ G8 f1 E8 t! n7 ~from datetime import date! C' |4 W. `$ y+ }. k6 T& F
from datetime import timedelta% s; G  F: f& N. |# Y& I( K% N
: V) u3 l8 G/ v/ u8 ^
today = date.today()2 m# i3 Y) _1 o# [+ h1 L4 d% N* T1 {3 ]

0 C& m- f4 v. E, R4 F+ Jfor i in range(7):; ^& a9 E0 e! Y4 ^" c
    d = today - timedelta(days=i)
; }, U+ Y5 m7 m% Y* y$ a) J    if d.weekday() < 5:
- ]! h, r# a4 n2 G4 h% b( t5 P5 _        print(d). X- T5 g1 q; a7 K
7 p" D" s5 u1 T0 i' z' M) H
十三、从今天的日期和一个人的生日推算年龄5 i" l' a) L* V6 E
from datetime import date# q6 r- {$ m. O- H4 a) c* v9 b

. [, Q4 o8 N/ I+ Y* N* z& y. Z5 _0 W+ b
def calculate_age(born):
! o: w+ n: w' c6 B    today = date.today()9 C8 K8 |0 \8 Z; R# ]' @& Y
    try:! S" E/ u6 O! E# i5 |' K
        birthday = born.replace(year=today.year)
, c  }. A: ]# J1 S) E* q    except ValueError:7 L8 z& u9 V; L# K1 m* p
        birthday = born.replace(year=today.year, month=born.month + 1, day=1)
$ V, r# Q0 i& N% o    if birthday > today:! d* h$ L# C/ A, m
        return today.year - born.year - 18 U7 ]6 J! i- z0 o+ v4 B
    else:
% [, M- y/ z0 g, ^  y; t5 }/ R        return today.year - born.year0 e; i, m( Y, h! h( E6 N7 B
) f  u1 s5 C* g2 e
) \# r( s0 B3 h; X& a# L& e
print(calculate_age(date(2001, 3, 1)))
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十四、获得本月的第一个星期二
% W) V* h' ]+ F' g* Fimport calendar
: ^$ ]1 k7 L# A5 k) K& A1 Kfrom datetime import datetime' U7 W) @( \+ u$ E

0 Y" Z6 [, X' o# j6 ]1 L0 f/ ^: Jc = calendar.Calendar(firstweekday=calendar.SUNDAY)# E3 F, o- p5 n. Z; f% e' t; m
monthcal = c.monthdatescalendar(datetime.today().year, datetime.today().month)
: D4 H8 ?, _' [5 [& y& J# p9 O#Python小白学习交流群:153708845  - W$ F4 L0 v1 e- ^  m
try:$ @: G! C) @2 a- ~0 T8 n% c
    tues = [day for week in monthcal for day in week if
9 w8 j9 y( o+ S3 e+ o$ }            day.weekday() == calendar.TUESDAY and day.month == datetime.today().month][0]# V3 [/ o/ w  F# }, D
    print(tues)
4 @9 }+ w) B6 g+ @9 I9 Bexcept IndexError:1 U2 U- _) C' i, K+ _; w
    print('No date found')2 o- w% ~% R% y: e% C2 w

7 i) O% f1 i8 N" k& F0 J十五、将整数转换为日期对象
2 @5 j6 a8 p: c$ m& dfrom datetime import datetime4 o, d! ~6 F! ^- n3 Q
# {5 P4 e/ [1 B* b1 x) ]. Y* [
i = 15457300730 j: W5 w, V+ U9 t7 L% h
timestamp = datetime.fromtimestamp(i); Z1 K3 O' }: C3 h+ |! D
: ?( L. ?) Q1 |+ ?
print(timestamp)  # 2018-12-25 14:57:53+ U* b9 h$ n) K
print(type(timestamp))
2 X7 L5 c( N; S! f1 s! H7 @6 o! z  _" e
十六、当前日期减去 N 天的天数
) N. c- K, [& i; m2 L1 c$ a4 P  afrom datetime import datetime, timedelta
2 P: ^/ V2 c# E/ p9 S* ?
) h9 H3 a, G; x6 }5 Q1 Vd = datetime.today() - timedelta(days=5)
7 I6 R- W+ O  @print(d)
6 @$ T0 t, g2 C1 e% l9 b* Z6 C; \5 h# h% o/ _, K. P" Q7 L. A- p
十七、比较两个日期9 N5 z: e- y- `+ W9 q8 y/ `# v
import datetime4 A& X. q+ |4 |% w! f" a
/ V# p8 M( ?5 s9 K0 N" E
a = datetime.datetime(2020, 12, 31, 23, 59, 59)
% _1 f, O4 g- [  y' Ob = datetime.datetime(2020, 11, 30, 23, 59, 59)
$ N1 i/ |% i1 W2 _( |% y
' Q' B4 D: \, {2 [print(a < b)
. z" k% r  Z! A7 ?8 yprint(a > b)
7 H1 A  g& K# P8 M$ {/ \$ s% B; Y2 u) ^* k
十八、从 datetime 对象中提取年份
8 [4 H% k: p9 b0 X" Uimport datetime
  I) j1 _& R: ^* G7 s. @) Z  g5 W- L1 q
year = datetime.date.today().year
' U; u$ v1 v$ f6 }3 G. Z6 tprint(year), u; V, v: @, H1 B( S5 O6 s4 F

7 n/ g  w- J  R1 C8 \十九、根据日期找到星期几- g$ b/ U% _+ N# h- F7 [
import pendulum4 p2 J4 z% v" C

" R% o2 G$ O& ~$ k- C) w4 [) ^dt = pendulum.parse('2021-05-18')
7 L& C5 B! u; P2 _( Aprint(dt.day_of_week)  # 2
* N0 x/ D( N9 _
9 U- z6 H" n% b! N% f4 T, Xdt = pendulum.parse('2021-05-01')
9 l& P) Q# b# F- N5 [: y9 g! Jprint(dt.day_of_week) # 6
* y' {: X9 q: [+ E9 G4 T0 B/ D+ f+ B+ o9 U  S
dt = pendulum.parse('2021-05-21')
) z& m2 o! [* L1 d- @1 b9 y: @print(dt.day_of_week) # 5/ c$ F/ f3 i2 B) R7 L

( F9 u+ Y$ l' E0 L( t  }/ |7 K二十、从当前日期获取 7 天前的日期5 p. W( Y8 l! t5 e$ r, Z- {
from datetime import datetime, timedelta
+ s' u, ^* J/ _4 |$ b, y* w/ w8 C3 e0 d- Y; b# R
now = datetime.now()
1 N+ K/ N/ T$ c; p
# E/ ^6 g# l/ H1 ~for x in range(7):- D( ]0 D6 ~' e! A
    d = now - timedelta(days=x); G: p2 z9 g4 y0 Z- a5 ^
    print(d.strftime("%Y-%m-%d"))- _' |8 y) d) D6 w8 o

6 T8 ], s7 ?5 Z9 G二十一、将两个日期时间对象之间的差值转换为秒5 g$ g/ ^+ H' M
import datetime1 v1 }  X9 b2 |4 a3 q

5 f: l2 s! @2 t9 |+ ftime1 = datetime.datetime.strptime('19 01 2021', '%d %m %Y')
; b, [- |/ e+ ?, H3 p- Ztime2 = datetime.datetime.strptime('25 01 2021', '%d %m %Y')
: s# t, V7 p% T9 n
% h- x7 I5 O* R) Odifference = time2 - time1
. S- B/ D4 L) R6 a" dprint(difference)  # 6 days, 0:00:008 n2 I* c# e# f+ [
4 Z# `2 E" j; I6 ^
seconds = difference.total_seconds()& x% W4 V- K6 c( p- h% C
print(seconds)  # 518400.0$ B. }; E# I1 c

; U& d5 y  x' ~, ~9 b二十二、获得任何一个月的第N个星期五: F; d4 [9 X/ A) ^8 S
import calendar
" |, l4 u! n: O! z5 R6 e, ~$ Q" X
# 取2021年5月的第三个星期五
% ^2 ^, @8 `; ^, f1 kc = calendar.Calendar(firstweekday=calendar.SUNDAY)0 }  @) k+ t# r$ p. u: j
year = 2021
% B, l3 M: N% T2 }: g* Q2 y$ \# I, Gmonth = 5
) G+ d1 X2 q6 U1 R: e' H) `n = 2  # 取第三个
% ?4 B( Q% c& J  umonthcal = c.monthdatescalendar(year, month)
, ?) B( B1 h* W+ q
5 L& {% z% G9 ?" ttry:
' J/ ~8 c* D. i6 i( Y/ w    third_friday = [8 D6 V) o# k3 R& g2 Y' F
        day for week in monthcal
- {+ J7 M2 B" S5 N& ?            for day in week if
) c+ Y9 e5 [% @$ S                day.weekday() == calendar.FRIDAY and day.month == month
; c: s/ J- E- b0 z    ][n]+ Q4 D" ^. x0 w. o
    print(third_friday)  # 2021-05-21$ Z* h3 {/ `8 g. H0 `0 d
except IndexError:
; b2 t7 F/ D  @; m# z4 D    print('No date found')( i+ E: I: X/ y+ `$ l

, [4 s6 R7 H8 P" A9 j. c  b& G! o二十三、根据周数获取日期
' _+ _4 t8 Z  o& A/ pimport datetime) p' P- q6 s# K3 c) O( D: j
from dateutil.relativedelta import relativedelta
6 p: Q2 `0 |2 K+ z, Y4 Y: D6 @2 d3 O) T7 A6 h5 h
week = 25
1 S9 y# w& W1 o5 [, o5 hyear = 2021. [: Y/ m: n- s6 d$ U8 H7 ?. e& l
date = datetime.date(year, 1, 1) + relativedelta(weeks=+week)
9 h  F) v9 u$ x% A$ a# G$ G9 gprint(date)  # 2021-06-25
* N7 R# L; \; ?
6 M) z& u6 @3 y6 {# t二十四、获取特定日期的工作日
0 b; p: @$ t1 v  F' eimport datetime5 C0 c8 V8 t9 r. I1 G+ r! l# R- K+ a7 k

% \& p* d/ V8 t" K- t9 |print(datetime.date(2020, 5, 15).isocalendar()[2])  # 5% c4 M( g$ s0 f0 v9 r$ F
. X$ q+ m/ e' T6 V* w& o
二十五、创建一个 15 分钟前的 DateTime
& x' N2 E( w7 Y* Q( Q" @import datetime
' w" V' R; S7 S7 g0 r1 R$ L#Python小白学习交流群:153708845  " X6 f1 z& f* E# Q2 {9 c, P
dt = datetime.datetime.now() - datetime.timedelta(minutes=15)6 f9 S3 |* o; \! t+ C- W
print(dt)  # 2021-05-15 22:25:55.897365; j2 m& M/ U& \; C. }' z# E8 h

0 m& e/ _5 n. F/ J# y, L二十六、从特定日期获取周的开始和结束日期
& z& [  h& X; Y9 Bimport pendulum. Z5 I# |2 n/ n8 p* E2 o2 c

; J0 V* X% B% j$ Ldt = pendulum.datetime(2012, 9, 5)" Q/ r5 F) V" q- }* T5 T
4 ~0 N* d( v- D& x
start = dt.start_of('week')( W1 v% n! S' Y- y) b
print(start.to_datetime_string())  # 2012-09-03 00:00:00) Q. H  n+ T2 O8 ~. H% f

1 z4 k; l3 m2 I. n0 q: Y* [, @) mend = dt.end_of('week')
6 O1 C3 o1 F  W. a, o$ aprint(end.to_datetime_string())  # 2012-09-09 23:59:59- D6 p( {9 Z; L6 U% u

1 S& T; o# x' U; q% r/ }二十七、两个日期之间的差异(以秒为单位)
* A, p# Q  b: {" j& I( dfrom datetime import datetime
3 B; n: p, i  o9 ?+ Y) X0 [( V#Python小白学习交流群:153708845 ' j( P8 m( C0 k7 T3 I& m: C
fmt = '%Y-%m-%d %H:%M:%S'
& H; _& r9 \6 A4 sd1 = datetime.strptime('2020-01-01 17:31:22', fmt)
8 ]6 W! E) x; G+ v$ r% }  l# ~+ Fd2 = datetime.strptime('2020-01-03 17:31:22', fmt)( g3 x4 B; j/ R$ ~% @5 F, d
$ D6 B, D( [2 j+ i# S# p
days_diff = d2 - d1
( q' S( [; R" r8 Fprint(days_diff.days * 24 * 60 * 60)  # 172800/ n; Z0 q$ P/ _- h7 s
5 \3 T, _, @/ L0 F7 v/ X# v9 I- Q9 ]
二十八、以这种格式获取昨天的日期MMDDYY
) c. x6 c& b* o2 D9 N2 gfrom datetime import date, timedelta6 G- t) @5 V, I  C' F
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yesterday = date.today() - timedelta(days=1)4 X+ U9 h$ E) l+ O, ^" e# J
print(yesterday.strftime('%m%d%y'))  # 0514212 K5 F+ [8 r. J) {7 U
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二十九、根据今天的日期获取上周三的日期' k7 U  _% G. K7 c
from datetime import date
1 v: E, f0 d& Ffrom datetime import timedelta  V+ d/ b3 @1 C

) C. w$ x$ ^9 A; f( k8 Etoday = date.today()
7 ]: g( g+ ^* M1 ^. [4 |8 {: E; d4 N0 Z9 `4 m9 v
offset = (today.weekday() - 2) % 7
0 W8 g3 r6 b) R! {: r& m5 {' mwednesday = today - timedelta(days=offset)
1 d+ y* D3 M4 E/ [- k3 mprint(wednesday)  # 2021-05-12
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三十、所有可用时区的列表打印) o. Q, @" ^$ [
import pytz
& J: N* e, }4 ], v8 a) B- Z6 K4 o* ~" y, I  B
for i in pytz.all_timezones:3 S4 r9 w7 I7 |7 ]4 D0 F6 y# n- ~
    print(i)7 A. a" a( s9 G/ Q

% s+ k0 G1 S" D) Y* S, J4 l: q# o( O% V; n$ @  L$ Q
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