// Surveyor Tools
GPS calendar 2021: GPS week and day of year (DOY) for every date Tools › GPS week and day of year › 2021 In 2021, GPS weeks run from 2138 (January 1) to 2190 (December 31), and the year has 365 days. Under each date, the small number is the day of year (DOY) used in RINEX file names.
GPS calendar 2021
January
GPS week Sun 0 Mon 1 Tue 2 Wed 3 Thu 4 Fri 5 Sat 6
2138 1 001 2 002 2139 3 003 4 004 5 005 6 006 7 007 8 008 9 009 2140 10 010 11 011 12 012 13 013 14 014 15 015 16 016 2141 17 017 18 018 19 019 20 020 21 021 22 022 23 023 2142 24 024 25 025 26 026 27 027 28 028 29 029 30 030 2143 31 031
February
GPS week Sun 0 Mon 1 Tue 2 Wed 3 Thu 4 Fri 5 Sat 6
2143 1 032 2 033 3 034 4 035 5 036 6 037 2144 7 038 8 039 9 040 10 041 11 042 12 043 13 044 2145 14 045 15 046 16 047 17 048 18 049 19 050 20 051 2146 21 052 22 053 23 054 24 055 25 056 26 057 27 058 2147 28 059
March
GPS week Sun 0 Mon 1 Tue 2 Wed 3 Thu 4 Fri 5 Sat 6
2147 1 060 2 061 3 062 4 063 5 064 6 065 2148 7 066 8 067 9 068 10 069 11 070 12 071 13 072 2149 14 073 15 074 16 075 17 076 18 077 19 078 20 079 2150 21 080 22 081 23 082 24 083 25 084 26 085 27 086 2151 28 087 29 088 30 089 31 090
April
GPS week Sun 0 Mon 1 Tue 2 Wed 3 Thu 4 Fri 5 Sat 6
2151 1 091 2 092 3 093 2152 4 094 5 095 6 096 7 097 8 098 9 099 10 100 2153 11 101 12 102 13 103 14 104 15 105 16 106 17 107 2154 18 108 19 109 20 110 21 111 22 112 23 113 24 114 2155 25 115 26 116 27 117 28 118 29 119 30 120
May
GPS week Sun 0 Mon 1 Tue 2 Wed 3 Thu 4 Fri 5 Sat 6
2155 1 121 2156 2 122 3 123 4 124 5 125 6 126 7 127 8 128 2157 9 129 10 130 11 131 12 132 13 133 14 134 15 135 2158 16 136 17 137 18 138 19 139 20 140 21 141 22 142 2159 23 143 24 144 25 145 26 146 27 147 28 148 29 149 2160 30 150 31 151
June
GPS week Sun 0 Mon 1 Tue 2 Wed 3 Thu 4 Fri 5 Sat 6
2160 1 152 2 153 3 154 4 155 5 156 2161 6 157 7 158 8 159 9 160 10 161 11 162 12 163 2162 13 164 14 165 15 166 16 167 17 168 18 169 19 170 2163 20 171 21 172 22 173 23 174 24 175 25 176 26 177 2164 27 178 28 179 29 180 30 181
July
GPS week Sun 0 Mon 1 Tue 2 Wed 3 Thu 4 Fri 5 Sat 6
2164 1 182 2 183 3 184 2165 4 185 5 186 6 187 7 188 8 189 9 190 10 191 2166 11 192 12 193 13 194 14 195 15 196 16 197 17 198 2167 18 199 19 200 20 201 21 202 22 203 23 204 24 205 2168 25 206 26 207 27 208 28 209 29 210 30 211 31 212
August
GPS week Sun 0 Mon 1 Tue 2 Wed 3 Thu 4 Fri 5 Sat 6
2169 1 213 2 214 3 215 4 216 5 217 6 218 7 219 2170 8 220 9 221 10 222 11 223 12 224 13 225 14 226 2171 15 227 16 228 17 229 18 230 19 231 20 232 21 233 2172 22 234 23 235 24 236 25 237 26 238 27 239 28 240 2173 29 241 30 242 31 243
September
GPS week Sun 0 Mon 1 Tue 2 Wed 3 Thu 4 Fri 5 Sat 6
2173 1 244 2 245 3 246 4 247 2174 5 248 6 249 7 250 8 251 9 252 10 253 11 254 2175 12 255 13 256 14 257 15 258 16 259 17 260 18 261 2176 19 262 20 263 21 264 22 265 23 266 24 267 25 268 2177 26 269 27 270 28 271 29 272 30 273
October
GPS week Sun 0 Mon 1 Tue 2 Wed 3 Thu 4 Fri 5 Sat 6
2177 1 274 2 275 2178 3 276 4 277 5 278 6 279 7 280 8 281 9 282 2179 10 283 11 284 12 285 13 286 14 287 15 288 16 289 2180 17 290 18 291 19 292 20 293 21 294 22 295 23 296 2181 24 297 25 298 26 299 27 300 28 301 29 302 30 303 2182 31 304
November
GPS week Sun 0 Mon 1 Tue 2 Wed 3 Thu 4 Fri 5 Sat 6
2182 1 305 2 306 3 307 4 308 5 309 6 310 2183 7 311 8 312 9 313 10 314 11 315 12 316 13 317 2184 14 318 15 319 16 320 17 321 18 322 19 323 20 324 2185 21 325 22 326 23 327 24 328 25 329 26 330 27 331 2186 28 332 29 333 30 334
December
GPS week Sun 0 Mon 1 Tue 2 Wed 3 Thu 4 Fri 5 Sat 6
2186 1 335 2 336 3 337 4 338 2187 5 339 6 340 7 341 8 342 9 343 10 344 11 345 2188 12 346 13 347 14 348 15 349 16 350 17 351 18 352 2189 19 353 20 354 21 355 22 356 23 357 24 358 25 359 2190 26 360 27 361 28 362 29 363 30 364 31 365
FAQ
When does the GPS week start? The GPS week starts on Sunday at 00:00 GPS time and is counted from January 6, 1980 (week 0). GPS time is currently 18 seconds ahead of UTC.
What is the day of year (DOY)? It is the day number counted from January 1 (001) to December 31 (365, or 366 in a leap year). It appears in RINEX file names and in the folders of GNSS data servers.
What is today's GPS week? Open the GPS week and day-of-year calculator: it shows the GPS week, the day of year and a live GPS clock, and converts any date.
