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Python处理日期方法大全、三十种方法

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发表于 2024-3-22 11:30 |只看该作者 |倒序浏览
|招呼Ta 关注Ta
使用 time 模块展示当前日期和时间/ z& K- K1 S0 B' J
import time
% S  y( c( e7 p2 Yfrom time import gmtime, strftime8 j2 z  ]' w* l. Z6 Z
& [; u! I( [5 W; W& x/ j3 U( K
t = time.localtime()  
& h; j& N; [  Q- [print (time.asctime(t))  # Sun May 7 09:30:37 20177 p" Z$ y6 E" T$ M
print(strftime("%a, %d %b %Y %H:%M:%S +0000", gmtime()))  # Sun, 07 May 2017 04:00:37 +0000* X; |. r$ y$ ?- Y  j+ E' r3 w) }
print(strftime("%A", gmtime()))  # Sunday
1 P9 {6 i, ~2 i) {# s/ o0 kprint(strftime("%D", gmtime()))  # 05/07/172 D( P9 G7 p$ z0 r
print(strftime("%B", gmtime()))  # May
/ S9 E& g3 \& r$ ?1 T6 I: U. aprint(strftime("%y", gmtime()))  # 17! j1 l+ d+ z8 f

0 v. P. h- S& a$ e, T8 ]6 P1 U  G# Convert seconds into GMT date! r4 {7 ]% \7 Y) ~" N
print(strftime("%a, %d %b %Y %H:%M:%S +0000", gmtime(1234567890)))  # Fri, 13 Feb 2009 23:31:30 +0000
! h0 G2 ~/ S- {2 M1 t
8 R  E. r$ T8 K  m9 z二、将天、小时、分钟转换为秒6 k# k9 `, ?. a, @" k
SECONDS_PER_MINUTE = 60
! d/ S9 n' `9 |, F6 a+ n" U+ zSECONDS_PER_HOUR = 3600* s6 \9 a4 e. j6 `& O. \, R* {
SECONDS_PER_DAY = 864002 A4 _3 N( e: r2 A+ r
' z5 \5 P- u. N% x. t
# 输入天、小时、分钟、秒的数量; E4 _, @/ {' J& V( _% v% u7 V. n
days = int(input("Enter number of Days: "))
  |( ]: s2 w0 Xhours = int(input("Enter number of Hours: "))3 b- d2 n# O7 A0 H4 g" x  `
minutes = int(input("Enter number of Minutes: "))
% e& k3 l4 {9 S( \. kseconds = int(input("Enter number of Seconds: "))8 }6 P( r) Y7 e$ J- B& p: j  B
  ]2 U- k- ]' @0 c, N$ z
# 计算/ B( M# P) z8 s
total_seconds = days * SECONDS_PER_DAY
/ f! ^$ f* {3 s1 ]total_seconds = total_seconds + ( hours * SECONDS_PER_HOUR)7 J3 K; A: y  {, k3 d5 z
total_seconds = total_seconds + ( minutes * SECONDS_PER_MINUTE)
! h# m/ P" D; z9 q3 z' Z9 ttotal_seconds = total_seconds + seconds+ {3 |& W* |% g% o
- U1 z3 ]& y6 o1 f1 W! M. [3 E
# 结果
( _% H8 V' B2 \7 b- k% E7 n7 Z3 Lprint("Total number of seconds: ","%d"%(total_seconds))
! v1 O( ^, n; [( y1 l: V0 ?3 `'''
/ F% k" T9 K- D1 M0 m0 X  W7 D4 q' q1 wEnter number of Days: 5& b! t" l7 J. X
Enter number of Hours: 36
3 N# m, q  N2 M+ DEnter number of Minutes: 24
3 s6 Y6 e1 l3 G# E* g# c7 tEnter number of Seconds: 15  a7 z0 y+ \5 O* C4 q
Total number of seconds: 563055, z6 F1 g6 ?0 b: |$ n3 G7 f
'''( S% C) J# w( ^! c( z& E

6 S" {7 f# a7 L: `  l" `7 p三、使用 Pandas 获取当前日期和时间- A7 e6 w# j- J% R3 c) F* p  K
import pandas as pd% r/ W2 Q8 m) }
print(pd.datetime.now())  # 2018-01-19 16:08:28.393553
! B+ W% I5 s& eprint(pd.datetime.now().date())  # 2018-01-19
6 U6 c1 {( h* `. @  h: Hprint(pd.datetime.now().year)  # 2018" i4 E7 |* k) H7 N  p$ {' h
print(pd.datetime.now().month)  # 1. J- T' S0 ~7 c0 ^- Y
print(pd.datetime.now().day)  # 19
( @9 b, z% P' Q. v: F& Qprint(pd.datetime.now().hour)  # 16
) Z  P  H# ]' u7 C( q% b9 i& sprint(pd.datetime.now().minute)  # 8
& q# ^2 I+ t8 R" m- zprint(pd.datetime.now().second)  # 281 V7 }& r1 O* h: n, ~
print(pd.datetime.now().microsecond)  # 394553; s! o- U& D6 i! Z+ V

0 C. i( c: }" B" o四、将字符串转换为日期时间对象
# M% M' l  ^, O$ T* Ofrom datetime import datetime
+ {4 j, F2 U, P/ u4 f/ z" x8 Ufrom dateutil import parser7 F9 O2 A0 f* g

% p7 C, \5 w6 f( {& ?' _d1 = "Jan 7 2015  1:15PM"
: k2 C; d, U- z$ t2 f+ }: M/ ]( id2 = "2015 Jan 7  1:33PM"1 S3 f( _' J2 D: c

0 K( z. H! U4 Q5 C% v# If you know date format) D( j# o3 F7 X
date1 = datetime.strptime(d1, '%b %d %Y %I:%M%p')
- M1 L- E$ b( Q6 F, P# w/ \print(type(date1))  # class 'datetime.datetime') Z7 S5 U% \# d9 `( g/ @4 ?
print(date1)  # 2015-01-07 13:15:00
; k, N- `( h# I! I, F: A, U. A( p- q) s. v; k6 ~1 ^0 r5 X
# If you don't know date format0 p  V# T% L, Q) A
date2 = parser.parse(d2)2 a' f. u5 d" N. T, ?
print(type(date2))  # class 'datetime.datetime'8 P6 E' k! N6 ?, a0 W
print(date2)  # 2015-01-07 13:33:003 ^( a2 N6 ]% |

; [, c8 s7 m9 ]% d+ }% J7 s: k. n五、以毫秒为单位获取当前时间
) r8 T! L/ W" e& @5 U/ v) Vimport time1 Y- E. n1 J* n0 f1 n, X& _
/ C' B6 g2 U; a# P
milliseconds = int(round(time.time() * 1000))/ L5 X/ `/ X& {
print(milliseconds)  # 1516364270650
3 h6 p2 s: q, W# s2 t- Q
9 k# P$ P6 P1 t" i& |六、以 MST、EST、UTC、GMT 和 HST 获取当前日期时间
. n8 |$ _, F0 Ffrom datetime import datetime
) G3 n0 V0 x% `; }1 W' }0 Nfrom pytz import timezone
, _; b& ^0 {+ O( P8 j
6 g6 p& }) ]) j& Q% z" Tmst = timezone('MST')
6 R+ J  Q2 h- q8 o- Xprint("Time in MST:", datetime.now(mst))  # Time in MST: 2017-01-19 06:06:14.495605-07:00' p; e) a7 }6 i
est = timezone('EST')5 A9 S! c* P1 P: K0 O
print("Time in EST:", datetime.now(est))  # Time in EST: 2017-01-19 08:06:14.496606-05:00
+ {" P1 ?; H) n' lutc = timezone('UTC')1 Q. W. p% c3 Y2 ~' o* y6 }. J
print("Time in UTC:", datetime.now(utc))  # Time in UTC: 2017-01-19 13:06:14.496606+00:00
- ~& y0 _) j5 v  E/ w# Mgmt = timezone('GMT')# y5 }+ }8 C( c( U2 k
print("Time in GMT:", datetime.now(gmt))  # Time in GMT: 2017-01-19 13:06:14.496606+00:00$ ?; S9 `6 S& _1 n5 E
hst = timezone('HST'): P- |* k7 v& }! D& ]( z
print("Time in HST:", datetime.now(hst))  # Time in HST: 2017-01-19 03:06:14.497606-10:009 N8 K+ H7 R: B/ m, v; f, v

7 T. H' n3 Q& @七、从给定的日期当中获取星期几
: e9 Y3 y# J) J- ?. Oimport datetime
4 W5 L3 t+ b) c, e+ o5 R: U$ D& U9 X+ K* x" ^
dayofweek = datetime.date(2010, 6, 16).strftime("%A")0 u4 Q' U( y4 V+ Y& A8 n# d8 l  Q
print(dayofweek)  # Wednesday) J- ?  \0 e( R( i% ~
$ |4 l' G  e3 p: {8 |
# weekday()方法: 0代表周一,6代表周日7 x) Z% g1 }* x: k: a# D, O
print("weekday():", datetime.date(2010, 6, 16).weekday())  # weekday(): 2) i/ i" c! ~2 W
; H. k' l! O9 }( e. i
# isoweekday() 方法: 1代表周一,7代表周日. {  R& D3 G1 T
print("isoweekday()", datetime.date(2010, 6, 16).isoweekday())  # isoweekday() 3
7 b5 }5 b# l9 F
+ E3 g/ m* |# F4 L/ ydayofweek = datetime.datetime.today().strftime("%A")
6 J2 `8 V1 u4 ?9 v0 f5 _% Tprint(dayofweek)  # Friday
% @" ]6 P9 k6 \' @# Y- Pprint("weekday():", datetime.datetime.today().weekday())  # weekday(): 40 t5 f0 q" L- @* C
print("isoweekday()", datetime.datetime.today().isoweekday())  # isoweekday(): 5
3 e% Y4 A7 Z" F4 U! H, e9 F+ a9 u! q3 D) k% y9 H. L  i
八、计算两个日期时间对象之间的时差
8 Y% Y7 Y9 A# j3 ~- A$ a. Vimport datetime
7 x" |+ u- }7 Nfrom datetime import timedelta8 N  F4 M; t0 T( J

) h( b2 H% e0 r: N7 _0 W7 MdatetimeFormat = '%Y-%m-%d %H:%M:%S.%f'5 g7 J* x# `1 Z$ R
date1 = '2016-04-16 10:01:28.585'
0 N, f( P3 F2 ~( Xdate2 = '2016-03-10 09:56:28.067'
5 N2 V. S; x0 T, ^) Adiff = datetime.datetime.strptime(date1, datetimeFormat)\
, I0 @& j$ ~& F) b( B+ W1 Y    - datetime.datetime.strptime(date2, datetimeFormat)
' Z/ z3 W  V+ X. j1 n/ }& N% [1 T6 m! m! O
print("Difference:", diff)  # Difference: 37 days, 0:05:00.518000
" O1 L, J2 a' x) r8 k/ zprint("Days:", diff.days)  # Days: 37
" J9 ~! B9 P, L4 K- i8 Cprint("Microseconds:", diff.microseconds)  # Microseconds: 518000) P4 j# O$ {& ^! V( l7 t
print("Seconds:", diff.seconds)  # Seconds: 300- ?& Q& q, T1 K9 C

/ H- O  W) \) z, q/ P. Y  p$ n九、将 5 分钟添加到 Unix 时间戳6 Z9 G7 d9 N( o. Q  b" t
import datetime4 F" w! |( ~5 N
import calendar! W1 q2 n* V0 v7 Z. P' Y
6 H/ J  r* a+ y8 v( V
future = datetime.datetime.utcnow() + datetime.timedelta(minutes=5)
- k1 ]2 v' |* `. sprint(calendar.timegm(future.timetuple()))  # 1621069619
  [: B4 K: o" \8 ?2 x: b( X* U( X/ f. W, e' o' D) h& P; v$ R1 {% N
十、遍历一系列日期
* q7 O* J6 Z; Pimport datetime
' p, i: ^  a3 ]' Q2 v* M, g6 F: ], O  e" G( @
start = datetime.datetime.strptime("21-06-2020", "%d-%m-%Y")
0 d$ o. G4 z- {* |" M2 P" W% |end = datetime.datetime.strptime("05-07-2020", "%d-%m-%Y")
, K" N! ~; `  e) e. P; O9 edate_generated = [start + datetime.timedelta(days=x) for x in range(0, (end - start).days)]
* Y# ]7 @( Q& |4 z! @# d1 Z% W" l- v1 f2 r
for date in date_generated:
/ u6 c9 B/ t  G  D' F( k    print(date.strftime("%d-%m-%Y"))
$ f% x# ^5 ~/ G' w. }
0 T- E! {1 k* o8 e) f2 Z+ i十一、巴黎时间更改为纽约时间
& F7 Q" ]' g( q0 Iimport pendulum0 d4 |( X1 d$ Y* f2 d+ ~
' J7 a) E5 X& j/ L5 y
in_paris = pendulum.datetime(2016, 8, 7, 22, 24, 30, tz='Europe/Paris')& D0 ^9 K2 C- ^. D# O
print(in_paris)  # 2016-08-07T22:24:30+02:00
* N4 {8 h: o1 e6 J. E3 X
; V3 C' ?: {1 b3 C2 x  w3 V- bin_us = in_paris.in_timezone('America/New_York')
( `5 C9 J8 j# `print(in_us)  # 2016-08-07T16:24:30-04:00
% J) L. T' P3 D! `
# T9 d+ E3 x7 ~! [8 |# }4 X十二、使用 Python 获得最后7个工作日
: Q% _6 M( ^- K7 N2 K% Wfrom datetime import date
5 M2 }$ A8 ^+ T# \) m& @from datetime import timedelta
7 B7 [* u5 e  l' N  R( Y* d) k* S) u/ _% Q
today = date.today()
9 \9 y/ i# a2 F6 a% `+ A. t6 f9 S. y  O
for i in range(7):
2 l/ ]8 q3 |0 o% b: v    d = today - timedelta(days=i)9 i  |  R3 R* ~
    if d.weekday() < 5:
9 |: w5 ^0 V4 N0 w  G5 b% `6 o        print(d); i* k. v- _' H/ O4 O: I- k
% ?1 E. Z6 v  s" E) F
十三、从今天的日期和一个人的生日推算年龄. ^# a# q) X) a3 Y4 G1 k  q
from datetime import date# I" }3 e, q$ m: O' T  a9 W, l! @1 P

0 L# y' \$ X6 g: s
/ H' M9 ^+ H9 |$ P- Rdef calculate_age(born):
3 G' N& ?! A. D7 }, `3 I    today = date.today()
0 e* \' z4 }( d1 F/ n( C, O& w( L    try:- O' F/ c) |; S
        birthday = born.replace(year=today.year)
+ P+ K$ b9 N, s; a0 _9 D  l5 c    except ValueError:8 T' {2 o6 D2 n% h+ q- X1 |# b
        birthday = born.replace(year=today.year, month=born.month + 1, day=1)
9 A8 T1 s/ L; A3 h, {) L    if birthday > today:& U1 C% O/ Y% l6 T2 Z: N
        return today.year - born.year - 1  e' B$ l6 x7 u8 R
    else:
' `+ M3 Z( P) W9 E        return today.year - born.year
2 x: b. |2 J! h  I' ~! {, D4 ^' d
0 m/ Y  Q: [' s, ^# |' t* o' A" R, b! l: a/ j: l) i
print(calculate_age(date(2001, 3, 1))), s: \) d/ o$ V. _
  x0 g; J( D& t
十四、获得本月的第一个星期二
) Z# \0 V  m. s& V/ [4 `, ~1 [import calendar
: }- A; E: @: ~! u, R$ q/ B+ J& Z5 yfrom datetime import datetime7 Z! w& c, R; P& r8 A+ Z0 a
6 r. m4 s1 q" b; s9 _6 M7 D
c = calendar.Calendar(firstweekday=calendar.SUNDAY): F; e) R; E- z$ S
monthcal = c.monthdatescalendar(datetime.today().year, datetime.today().month)
/ n) k$ t/ v. Q; S#Python小白学习交流群:153708845  
/ t  m* g* M3 R2 J$ ~" m' M1 ktry:
0 y/ Y8 n9 g, L    tues = [day for week in monthcal for day in week if
4 a1 {9 q' O& h  ^            day.weekday() == calendar.TUESDAY and day.month == datetime.today().month][0]6 _8 P" O- ^2 N- P
    print(tues)
, I9 [  B( D0 |) {  W9 rexcept IndexError:  y4 c  K' C# q0 @* p6 B& `
    print('No date found')
7 ^% a, R) o+ H  [& ~7 a, K3 J  y4 R5 W. S7 q
十五、将整数转换为日期对象
2 ~  T5 M2 c+ [from datetime import datetime$ f# ~8 W. o' P$ A1 q9 ~
" j1 O6 v3 Y5 c4 T! }5 c
i = 1545730073: D0 V+ r9 B: G$ q( j. S+ n
timestamp = datetime.fromtimestamp(i)' G7 ^7 {* ?; D# T
& x% U; |$ Q/ ~# Y2 u8 q$ l6 N
print(timestamp)  # 2018-12-25 14:57:53
$ B" @" H! U* N# x$ ]" lprint(type(timestamp))
0 F/ T2 j' n+ P' C3 w! d2 i% A) ~0 K' R  b" d, a" X# c
十六、当前日期减去 N 天的天数; k; X  j/ {! h' C  R5 D0 A
from datetime import datetime, timedelta
$ W4 L- a$ V. O# n
9 |' O  o: C& l5 O3 x. t# sd = datetime.today() - timedelta(days=5)
' p" Z5 z+ ~' c0 F5 m% U! ~3 d! Iprint(d)3 @* R! ]/ g! ^+ ?
0 _/ H8 r* K9 C2 e7 n( V7 H
十七、比较两个日期
' B1 ?. e- X( [  Z- Mimport datetime
5 h/ K$ L: j* u) J; |9 g1 f/ h( v
$ P1 C6 h+ J* n- ~" y- G5 oa = datetime.datetime(2020, 12, 31, 23, 59, 59)8 z* v8 e! o0 L2 i
b = datetime.datetime(2020, 11, 30, 23, 59, 59)
8 r- V, o* b& S2 l/ }5 Q7 G. y7 D
3 Q! o5 `3 E8 V+ Q( wprint(a < b)
+ o# a# b) x" y& J$ O1 Uprint(a > b)  s. _/ G7 W, R5 y- f

1 r. d' Z; r% Q" L6 g6 |8 ]0 V* R; }十八、从 datetime 对象中提取年份
+ M' i( m! g. zimport datetime
& d2 l* p/ n  d. f. B. o* i. |( K) x9 O1 r
  w/ u" M' l- V/ H) Kyear = datetime.date.today().year
' d$ B. j& q1 h" ?. [; b, m3 v. Hprint(year)/ j$ t" T3 l, m0 z' G  M+ W
4 W# t- w& s5 |+ X  n+ s6 H* i# v0 J6 ?
十九、根据日期找到星期几
5 s9 T# }& L2 f- r* A6 y8 K# {import pendulum
, G" r' @7 y# [& D8 H$ i. J) Y# f" R) D7 Z" V5 ]$ Z6 u% `
dt = pendulum.parse('2021-05-18')
4 l+ `5 B1 z- K- q& o7 d  kprint(dt.day_of_week)  # 20 {4 C, r: u/ B. x0 P2 `' {# p: B
% f  ~3 ^% d) G4 [
dt = pendulum.parse('2021-05-01')
0 ]1 e# d- `4 O* Y$ a: Y% g# kprint(dt.day_of_week) # 6
/ [2 _; J' ]5 Q+ V3 ~' U. U# A6 s8 O, Z, Q0 n
dt = pendulum.parse('2021-05-21')% M7 L- [/ B+ c7 @( @
print(dt.day_of_week) # 5
# w7 V$ \) I4 w' D, W2 c' V+ _* L. N" ?0 i" T7 P; C' O* b
二十、从当前日期获取 7 天前的日期
. `& t" X1 F9 g- t, f* \5 wfrom datetime import datetime, timedelta
6 f: ~  K8 u. U: ]) H4 c' s7 o2 n9 N* A: _. W
now = datetime.now()  m6 v8 t7 s. s
" r) c" |( H* [$ e) j0 }
for x in range(7):
0 G) d. U! L2 e    d = now - timedelta(days=x)* t$ v% L) h  m+ @" i
    print(d.strftime("%Y-%m-%d"))
6 ~2 I- c# Z+ h* m7 |" M
1 [0 J6 R' f( ]  e) E# i( p二十一、将两个日期时间对象之间的差值转换为秒
& Z7 j; ^# T0 T( rimport datetime/ S+ Z# s& V( J, {
: _) q# k  e6 O4 P/ s/ s! B
time1 = datetime.datetime.strptime('19 01 2021', '%d %m %Y')% Y7 N2 W% @9 {; e: m
time2 = datetime.datetime.strptime('25 01 2021', '%d %m %Y')
+ Q; \9 y  b: e% z% A/ Q6 U, g
+ c0 x& G. J& |8 kdifference = time2 - time1
! J  v5 |1 H  N* L/ nprint(difference)  # 6 days, 0:00:00% {  z7 ?; g( U( i- e4 Z- \

6 [; M' v" @5 R* M; x6 B4 q; ^# e5 Bseconds = difference.total_seconds(): i  k; j8 F# B3 f" C) D
print(seconds)  # 518400.0  X/ l. A$ W3 k4 Z) }1 p0 H
- D0 K1 V3 }/ m% m
二十二、获得任何一个月的第N个星期五
9 b% r8 g4 f) ~, h0 Fimport calendar
% f8 h# h) C7 x, D: I( w* V
# D, D2 @) w, O- W- m0 N) X/ s' L# 取2021年5月的第三个星期五
" b1 v4 c! z2 G. j, _( F8 h; oc = calendar.Calendar(firstweekday=calendar.SUNDAY)! B, ?" I6 A& n: D
year = 2021
! K5 q. L# x) U/ Xmonth = 5
# N: ]5 U; i, S( F( {+ {" E0 pn = 2  # 取第三个& Q+ I2 D5 n# u
monthcal = c.monthdatescalendar(year, month)2 F+ `+ A4 N$ c" X- o# P" ~. C
6 u4 E: F* [+ Y. P2 Z& R
try:4 R# R3 U( ]$ e  W& s& u
    third_friday = [
6 W$ [/ Z+ F5 c' U5 E2 c        day for week in monthcal
' ~: q: _2 y( H( w1 h            for day in week if
' i4 R$ K* Z- s" k                day.weekday() == calendar.FRIDAY and day.month == month7 q' s; Y# D; v  Q- x
    ][n]
2 |+ ?8 E& u' j    print(third_friday)  # 2021-05-21
7 s( I  F  I0 w+ vexcept IndexError:; ~4 ~* u# j9 Q- Z8 x6 `% {
    print('No date found')% w3 \5 l6 Z* M' ]/ Q

9 @# O9 T+ s0 m8 R9 D  \二十三、根据周数获取日期- a* f8 q$ d8 O2 I* N$ C& E
import datetime# v& e& m  ~% O' T0 |
from dateutil.relativedelta import relativedelta4 {, e1 B+ G% M- p4 [  R8 [  }
: d- g) @# U1 f! _$ `8 K
week = 256 }5 G: _: Z) r2 C
year = 2021" a8 B  D7 G* e+ J8 W; r7 D8 X' [
date = datetime.date(year, 1, 1) + relativedelta(weeks=+week)' o+ K" j' U+ S* k7 W4 m
print(date)  # 2021-06-25
8 F; F4 I$ r& M. _! @0 W6 ?( c# F1 |0 h, G' g. J; y
二十四、获取特定日期的工作日
* N! K* h  A' S" D7 ]& \/ r5 B$ zimport datetime
# ]) R0 p$ e( n$ d! R1 m
; ~+ @+ \+ x: n- r1 e$ Sprint(datetime.date(2020, 5, 15).isocalendar()[2])  # 5% r  ]1 V' w0 `1 ~; B! k. N7 u

- t5 |! O7 S! ?二十五、创建一个 15 分钟前的 DateTime& [. `( F8 i* i0 t
import datetime
8 b( _( h* ]& V6 t1 B! p#Python小白学习交流群:153708845  % ]0 i9 d( k8 h% g) q
dt = datetime.datetime.now() - datetime.timedelta(minutes=15)
1 W! [$ ]7 ]( z/ g) b8 x5 rprint(dt)  # 2021-05-15 22:25:55.897365( M9 w5 E9 f; f' k& H# f$ ?( K
! s: L( g" E, F- z( e
二十六、从特定日期获取周的开始和结束日期
* e! S2 e3 m- B3 J; Z: W1 \6 [import pendulum6 q; ~7 a/ b/ b: b2 w

" s- f5 V  o$ @$ w% K% Edt = pendulum.datetime(2012, 9, 5)+ v) g4 w; u" {* M9 ?( }
. W( [! W! C, v4 K
start = dt.start_of('week')7 R8 p( e  j9 Q: C6 ^* g8 e
print(start.to_datetime_string())  # 2012-09-03 00:00:00
) d) [& L0 Y  L, z
) K$ e5 i4 v; K. t8 Send = dt.end_of('week')
$ E$ g4 ?% Q& b  T: L( Qprint(end.to_datetime_string())  # 2012-09-09 23:59:59
9 k( v9 h# t' W" G9 n' [0 J9 X- a' u5 \8 C9 G8 V9 l
二十七、两个日期之间的差异(以秒为单位): d7 P6 U7 g9 ~& t: w/ V
from datetime import datetime' _( U0 r2 M/ }* I# S
#Python小白学习交流群:153708845
3 e# t  b+ q. }) }' s; Q4 kfmt = '%Y-%m-%d %H:%M:%S'4 q1 Y" d& M9 v  \. d' {
d1 = datetime.strptime('2020-01-01 17:31:22', fmt)
: m1 [+ v, g2 ad2 = datetime.strptime('2020-01-03 17:31:22', fmt)2 C" b. e% C7 G6 M6 ^# e' J) _

1 P2 h5 D- Y) ]- \3 ~3 y+ ddays_diff = d2 - d1* w: m9 e# G+ N: H3 ?; e
print(days_diff.days * 24 * 60 * 60)  # 1728003 `  `5 r5 r: a

/ i% m4 \+ Y/ U, d二十八、以这种格式获取昨天的日期MMDDYY8 G) @) N3 S9 q* R% @; i
from datetime import date, timedelta6 S% C, Y  ]  T4 }9 A  E0 V

( X" V2 S/ C& |2 q* B# Pyesterday = date.today() - timedelta(days=1)
9 ~) I$ v. b3 fprint(yesterday.strftime('%m%d%y'))  # 0514210 J0 M/ u& K1 r3 e

  ~* Q5 W. @0 ^" V& ~二十九、根据今天的日期获取上周三的日期5 N! V2 I/ L$ G$ \
from datetime import date& [) _9 b8 I' j/ x  ^
from datetime import timedelta) H0 z6 O$ k1 v% g8 P0 J9 T

, U( t9 t. _" v/ q5 D$ D+ jtoday = date.today()2 ?7 _0 M/ X4 r% `3 K  M
  W$ o( r2 v$ i% S6 L1 I- D1 n
offset = (today.weekday() - 2) % 7% ]* O/ M, o# {) j& E% `( l7 K
wednesday = today - timedelta(days=offset)
, [- L4 R5 c2 I$ v4 n, Wprint(wednesday)  # 2021-05-12
4 @, G) l2 J3 w1 T' ^+ m# B+ u
+ E+ w: n0 S5 V4 g' f5 C三十、所有可用时区的列表打印
/ l+ I  ~' Q* y) Y/ f  H7 Gimport pytz; Z  ?4 f& D; R. h
  s% j. h. @/ @% L2 Y6 @
for i in pytz.all_timezones:9 l( Q- x% l9 I% M% f& E/ Q
    print(i)
+ T1 @0 ~4 B& A4 C+ L, M
! L  ^8 A. q" ]; c2 }) {% ]1 v2 H/ |4 l. t5 X* P

% b5 ]9 x- J# I8 v! \
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