Summary of common operations on the Date type in javascript _ basic knowledge

The following is a summary of common operations on the Date type in javascript. I think it is quite good. Now I will share it with you and give you a reference. Let's take a look at it with xiaobian. Summary of common operations on Date type in javascript

/** 3. * Date and Time script library method list: 4. * (1) Date. isValiDate: date validity verification 5. * (2) Date. isValiTime: time validity verification 6. * (3) Date. isValiDateTime: Date and time validity verification 7. * (4) Date. prototype. isLeapYear: determines whether a leap year is used. * (5) Date. prototype. format: Date format 9. * (6) Date. stringToDate: String converted to date type 10. * (7) Date. daysBetween: calculates the number of days difference between two dates by 11. * (8) Date. prototype. dateAdd: date calculation, supporting positive and negative 12. * (9) Date. prototype. dateDiff: Compare date difference: compare two fields with the same period, return the difference value 13. * (10) Date. prototype. t OArray: divides a date into an array. The sequence numbers are respectively: year, month, day, hour, minute, and second. * (11) Date. prototype. datePart: Get date data information 15. */16. 17. 18. /** 19. * Date validity verification: determines whether dataStr meets the date format specified by formatStr 20. * example: 21. * (1) alert (Date. isValiDate ('1970-02-29 ', 'yyyy-MM-dd'); // true 22. * (2) alert (Date. isValiDate ('aaaa-58-29 ', 'yyyy-MM-dd'); // false 23. * dateStr: (required) date string 24. * formatStr: optional, Format String, optional format: (1) yyyy-MM-dd (default format) or YYYY-MM-DD (2) yyyy/MM/dd Or YYYY/MM/DD (3) MM- Dd-yyyy or MM-DD-YYYY (4) MM/dd/yyyy or MM/DD/YYYY 25. */26. date. isValiDate = function (dateStr, formatStr) 27. {28. if (! DateStr) {29. return false; 30.} 31. if (! FormatStr) {32. formatStr = "yyyy-MM-dd"; // default format: yyyy-MM-dd 33.} 34. if (dateStr. length! = FormatStr. length) {35. return false; 36 .} else {37. if (formatStr = "yyyy-MM-dd" | formatStr = "YYYY-MM-DD") {38. var r1 =/^ ([02468] [048]) | ([13579] [26]) (00 )) | (\ d {2} ([02468] [48]) | ([13579] [26]) \-(0 [13578]) | (1 [02]) \-([0-2] [0-9]) | (3 [01]) | (0 [469]) | (11) \-([0-2] [0-9]) | (30 ))) | (02 \-([0-2] [0-9]) | (\ d {2} ([02468] [1235679]) | ([13579] [01345789]) \-(0 [13578]) | (1 [02]) \-([0-2] [0-9]) | (3 [01])) | (0 [469]) | (11) \-([0-2] [0-9]) | (30 ))) | (02 \-([0-1] [0-9]) | (2 [0-8]) $/; 39. return r1.test (dateStr); 40 .} else if (formatStr = "yyyy/MM/dd" | formatStr = "YYYY/MM/DD") {41. var r2 =/^ ([02468] [048]) | ([13579] [26]) (00 )) | (\ d {2} ([02468] [48]) | ([13579] [26]) \/(0 [13578]) | (1 [02]) \/([0-2] [0-9]) | (3 [01]) | (0 [469]) | (11) \/([0-2] [0-9]) | (30 ))) | (02 \/([0-2] [0-9]) | (\ d {2} ([02468] [1235679]) | ([13 579] [01345789]) \/(0 [13578]) | (1 [02]) \/([0-2] [0-9]) | (3 [01]) | (0 [469]) | (11 )) \/([0-2] [0-9]) | (30) | (02 \/([0-1] [0-9]) | (2 [0-8]) $/; 42. return r2.test (dateStr); 43 .} else if (formatStr = "MM-dd-yyyy" | formatStr = "MM-DD-YYYY") {44. var r3 =/^ (0 [13578]) | (1 [02]) \-([0-2] [0-9]) | (3 [01]) | (0 [469]) | (11) \-([0-2] [0-9]) | (30) | (02 \-([0-2] [0-9]) \-([02468] [048]) | ([13579] [26]) (00) | (\ d {2} ([02468] [48]) | ([13579] [26]) | (0 [13578]) | (1 [02]) \-([0-2] [0-9]) | (3 [01]) | (0 [469]) | (11) \-([0-2] [0-9]) | (30 ))) | (02 \-([0-1] [0-9]) | (2 [0-8]) \-\ d {2} ([02468] [1235679]) | ([13579] [01345789]) $/; 45. return r3.test (dateStr); 46 .} else if (formatStr = "MM/dd/yyyy" | formatStr = "MM/DD/YYYY") {47. var r4 =/^ (0 [13578]) | (1 [02]) \/([0-2] [0-9]) | (3 [01]) | (0 [469]) | (11) \/([0-2] [0-9]) | (30) | (02 \/([0-2] [0-9]) \/([02468] [048]) | ([13579] [26]) (00) | (\ d {2} ([02468] [48]) | ([13579] [26]) | (0 [13578]) | (1 [02]) \/([0-2] [0-9]) | (3 [01]) | (0 [469]) | (11 )) \/([0-2] [0-9]) | (30) | (02 \/([0-1] [0-9]) | (2 [0-8]) \/\ d {2} ([02468] [1235679]) | ([13579] [01345789]) $/; 48. return r4.test (dateStr); 49 .} else {50. alert ("the date format is incorrect! "); 51. return false; 52 .} 53 .} 54. return false; 55 .} 56. 57. 58. /** 59. * Time validity verification: checks whether timeStr meets the time format specified by formatStr 60. * example: 61. * (1) alert (Date. isValiTime ('23: 59: 59', 'hh: mm: ss'); // true 62. * (2) alert (Date. isValiTime ('24-68-89 ', 'hh: mm: ss'); // false 63. * timeStr: (required) date string 64. * formatStr: Optional. Format String. Optional formats: (1) hh: mm: ss (default Format) (2) hh-mm-ss (3) hh/mm/ss 65. */66. date. isValiTime = function (timeStr, formatSt R) 67. {68. if (! TimeStr) {69. return false; 70.} 71. if (! FormatStr) {72. formatStr = "hh: mm: ss"; // default format: hh: mm: ss 73.} 74. if (timeStr. length! = FormatStr. length) {75. return false; 76 .} else {77. if (formatStr = "hh: mm: ss") {78. var r1 =/^ ([0-1] [0-9]) | (2 [0-3]) \ :( [0-5] [0-9]) \ :( [0-5] [0-9]) $/; 79. return r1.test (timeStr); 80 .} else if (formatStr = "hh-mm-ss") {81. var r2 =/^ ([0-1] [0-9]) | (2 [0-3]) \-([0-5] [0-9]) \-([0-5] [0-9]) $/; 82. return r2.test (timeStr); 83 .} else if (formatStr = "hh/mm/ss") {84. var r3 =/^ ([0-1] [0-9]) | (2 [0-3]) \/([0-5] [0-9]) \/( [0-5] [0-9]) $/; 85. return r3.test (timeStr); 86.} else {87. alert ("the time format is incorrect! "); 88. return false; 89 .} 90 .} 91. return false; 92 .} 93. 94. 95. /** 96. * Date and time validity verification 97. * Format: yyyy-MM-dd hh: mm: ss 98. */99. date. isValiDateTime = function (dateTimeStr) 100. {101. var dateTimeReg =/^ ([02468] [048]) | ([13579] [26]) (00 )) | (\ d {2} ([02468] [48]) | ([13579] [26]) \-(0 [13578]) | (1 [02]) \-([0-2] [0-9]) | (3 [01]) | (0 [469]) | (11) \-([0-2] [0-9]) | (30 ))) | (02 \-([0-2] [0-9]) | (\ d {2} ([0246) 8] [1235679]) | ([13579] [01345789]) \-(0 [13578]) | (1 [02]) \-([0-2] [0-9]) | (3 [01]) | (0 [469]) | (11 )) \-([0-2] [0-9]) | (30) | (02 \-([0-1] [0-9]) | (2 [0-8]) (\ s {1} ([0-1] [0-9]) | (2 [0-3]) \ :( [0-5] [0-9]) \ :( [0-5] [0-9])? USD/102. return dateTimeReg. test (dateTimeStr); 103 .} 104. 105. 106. /** 107. * leap year: the general rule is four years, one hour for a hundred years, and one hour for a hundred years. 108. */109. date. prototype. isLeapYear = function () 110. {111. return (this. getYear () % 4 = 0 & (this. get year () % 100! = 0) | (this. getYear () % 400 = 0); 112 .} 113. 114. 115. /** 116. * Date Format: 117. * formatStr: Optional. Format String. Default format: yyyy-MM-dd hh: mm: ss 118. * The format is as follows: 119. * (1) YYYY/yyyy/YY indicates the year 120. * (2) MM/M month 121. * (3) W/w 122 a week. * (4) dd/DD/d/D date 123. * (5) hh/HH/h/H time 124. * (6) mm/m min 125. * (7) ss/SS/s/S second 126. * (8) iii 127 Ms. */128. date. prototype. format = function (formatStr) 129. {130. varstr = formatStr; 131. if (! FormatStr) {132. str = "yyyy-MM-dd hh: mm: ss"; // The default format is 133 .} 134. var Week = ['day', 'yi', '2', '3', '4', '5', '6']; 135. 136. str = str. replace (/yyyy | YYYY/, this. getFullYear (); 137. str = str. replace (/yy | YY/, (this. getYear () % 100)> 9? (This. getYear () % 100 ). toString (): '0' + (this. getYear () % 100); 138. 139. str = str. replace (/MM/, this. getMonth ()> = 9? (ParseInt (this. getMonth () + 1 ). toString (): '0' + (parseInt (this. getMonth () + 1); 140. str = str. replace (/M/g, (parseInt (this. getMonth () + 1); 141. 142. str = str. replace (/w | W/g, Week [this. getDay ()]); 143. 144. str = str. replace (/dd | DD/, this. getDate ()> 9? This. getDate (). toString (): '0' + this. getDate (); 145. str = str. replace (/d | D/g, this. getDate (); 146. 147. str = str. replace (/hh | HH/, this. getHours ()> 9? This. getHours (). toString (): '0' + this. getHours (); 148. str = str. replace (/h | H/g, this. getHours (); 149. str = str. replace (/mm/, this. getMinutes ()> 9? This. getMinutes (). toString (): '0' + this. getMinutes (); 150. str = str. replace (/m/g, this. getMinutes (); 151. 152. str = str. replace (/ss | SS/, this. getSeconds ()> 9? This. getSeconds (). toString (): '0' + this. getSeconds (); 153. str = str. replace (/s | S/g, this. getSeconds (); 154. 155. str = str. replace (/iii/g, this. getMilliseconds () <10? '00' + this. getMilliseconds () :( this. getMilliseconds () <100? '0' + this. getMilliseconds (): this. getMilliseconds (); 156. 157. return str; 158 .} 159. 160. 161. /** 162. * convert string to date type: 163. * dateStr: (required) date string. If it cannot be parsed into a date type, null 164 is returned. * Format: 165. * (1) yyyy/MM/dd: General 166 for IE and FF. * (2) MM/dd/yyyy: General 167 for IE and FF. * (3) MM-dd-yyyy: IE only 168. * (4) yyyy-MM-dd: Non-IE, and the clock is resolved at eight o'clock 169. */170. date. stringToDate = function (dateStr) 171. {172. if (! DateStr) {173. alert ("the string cannot be parsed as a date"); 174. return null; 175 .} else {176. if (Date. isValiDate (dateStr, "yyyy/MM/dd") | Date. isValiDate (dateStr, "MM/dd/yyyy") {177. return new Date (Date. parse (dateStr); 178 .} else {179. if ((! -[1,]) {// Internet Explorer 180. if (Date. isValiDate (dateStr, "MM-dd-yyyy") {181. return new Date (Date. parse (dateStr); 182 .} else {183. alert ("the string cannot be parsed as a date"); 184. return null; 185 .} 186 .} else {// non-IE 187. if (Date. isValiDate (dateStr, "yyyy-MM-dd") {188. return new Date (Date. parse (dateStr); 189 .} else {190. alert ("the string cannot be parsed as a date"); 191. return null; 192 .} 193 .} 194 .} 195 .} 196. return null; 197 .} 198. 199. 200. /** 201. * The number of days difference between two dates: 202. * dateOne: required. It must be Data-type instance 203. * dateTwo: required. It must be Data-type instance 204. */205. date. daysBetween = function (dateOne, dateTwo) 206. {207. if (dateOne instanceof Date) = false | (dateTwo instanceof Date) = false) {208. return 0; 209 .} else {210. return Math. abs (Math. floor (dateOne. getTime ()-dateTwo. getTime ()/1000/60/60/24); 211 .} 212 .} 213. 214. 215. /** 216. * Date calculation: a negative number can be added or subtracted. The calculated date 21 is returned. 7. * num: required. It must be a number, and a positive value is a period plus. A negative value is a date minus 218. * field: Optional. It indicates the field on which the tag is added or subtracted. For the fields, see the following conventions. If this parameter is not set, the default value is d 219. * The format is as follows: 220. * (1) Y/y year 221. * (2) 222 M months. * (3) W/w week 223. * (4) D/d: 224. * (5) 225 H/h. * (6) m: 226. * (7) S/s 227 seconds. * (8) Q/q quarter: 228. */229. date. prototype. dateAdd = function (num, field) 230. {231. if ((! Num) | isNaN (num) | parseInt (num) = 0) {232. return this; 233.} 234. if (! Field) {235. field = "d"; 236 .} 237. switch (field) {238. case 'y': 239. case 'y': return new Date (this. getFullYear () + num), this. getMonth (), this. getDate (), this. getHours (), this. getMinutes (), this. getSeconds (); break; 240. case 'q': 241. case 'q': return new Date (this. getFullYear (), (this. getMonth () + num * 3), this. getDate (), this. getHours (), this. getMinutes (), this. getSeconds (); break; 242. case 'M ': Return new Date (this. getFullYear (), this. getMonth () + num, this. getDate (), this. getHours (), this. getMinutes (), this. getSeconds (); break; 243. case 'W': 244. case 'W': return new Date (Date. parse (this) + (86400000*7) * num); break; 245. case 'D': 246. case 'D': return new Date (Date. parse (this) + (86400000 * num); break; 247. case 'H': 248. case 'H': return new Date (Date. parse (this) + (3600000 * num )); Break; 249. case 'M': return new Date (Date. parse (this) + (60000 * num); break; 250. case's: 251. case's ': return new Date (Date. parse (this) + (1000 * num); break; 252. default: return this; 253 .} 254. return this; 255 .} 256. 257. 258. /** 259. * compare date difference: compare two fields with the same period, and return the difference of 260. * dtEnd: required. It must be Data-type instance 261. * field: (optional) field on which the logo is compared. For the fields, see the following conventions. If this parameter is not set, the default value is d 262. * The format is as follows: 263. * (1) Y/y year 264. * (2) 265 M months. * (3) W/w week 266. * (4) D/d: 267. * (5) 268 H/h. * (6) m: 269. * (7) S/s 270 seconds. */271. date. prototype. dateDiff = function (dtEnd, field) 272. {273. var dtStart = this; 274. if (dtEnd instanceof Date) = false) {275. return 0; 276 .} else {277. if (! Field) {278. field = "d"; 279 .} 280. switch (field) {281. case 'y': 282. case 'y': return dtEnd. getFullYear ()-dtStart. getfullyears (); break; 283. case 'M': return (dtEnd. getMonth () + 1) + (dtEnd. getFullYear ()-dtStart. getFullYear () * 12)-(dtStart. getMonth () + 1); break; 284. case 'W': 285. case 'W': return parseInt (dtEnd-dtStart)/(86400000*7); break; 286. case 'D': 287. case 'D': return parseInt (dtEn D-dtStart)/86400000); break; 288. case 'H': 289. case 'H': return parseInt (dtEnd-dtStart)/3600000); break; 290. case 'M': return parseInt (dtEnd-dtStart)/60000); break; 291. case's: 292. case's ': return parseInt (dtEnd-dtStart)/1000); break; 293. default: return 0; 294 .} 295. return 0; 296 .} 297 .} 298. 299. 300. /** 301. * divide the date into an array. The sequence numbers of the arrays are: year, month, day, hour, minute, second, and 302. */303. date. prototype. toArray = Function () 304. {305. var myArray = new Array (); 306. myArray [0] = this. getFullYear (); 307. myArray [1] = this. getMonth (); 308. myArray [2] = this. getDate (); 309. myArray [3] = this. getHours (); 310. myArray [4] = this. getMinutes (); 311. myArray [5] = this. getSeconds (); 312. return myArray; 313 .} 314. 315. 316. /** 317. * obtain date data: 318. * field: (optional) field on which the logo is compared. For the fields, see the following conventions. If this parameter is not set, the default value is d 319. * (1) Y/y year 320. * (2) 321 M months. * (3) W/w week 322. * (4) D/d: 323. * (5) 324 H/h. * (6) m: 325. * (7) S/s 326 seconds. */327. date. prototype. datePart = function (field) 328. {329. if (! Field) {330. field = "d"; 331 .} 332. var Week = ['day', 'yi', '2', '3', '4', '5', '6']; 333. switch (field) {334. case 'y': 335. case 'y': return this. getfullyears (); break; 336. case 'M': return (this. getMonth () + 1); break; 337. case 'W': 338. case 'W': return Week [this. getDay ()]; break; 339. case 'D': 340. case 'D': return this. getDate (); break; 341. case 'H': 342. case 'H': return this. getHours (); break; 343. case 'M': return this. getMinutes (); break; 344. case's ': return this. getSeconds (); break; 345. default: return this. getDate (); 346 .} 347. return this. getDate (); 348 .}

The common operations of the Date type in the above javascript section are all the content shared by the editor. I hope to give you a reference and support for the script.