What a Julian date means
The everyday "Julian date" printed on food packaging, military forms and batch codes is simply the day of the year: January 1 is 001 and December 31 is 365 (366 in a leap year). It is often written after a two- or four-digit year, so 27032 and 2027032 both mean February 1, 2027.
Astronomers use the Julian Day number instead: a continuous count of days since noon on January 1, 4713 BC, used to compare observations without worrying about calendars. Neither is the same as the Julian calendar, the Roman calendar that the Gregorian calendar replaced in 1582.
Julian date calendar for 2027
Day of the year for every date in 2027. Find the month along the top and the day down the side.
| Day | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 001 | 032 | 060 | 091 | 121 | 152 | 182 | 213 | 244 | 274 | 305 | 335 |
| 2 | 002 | 033 | 061 | 092 | 122 | 153 | 183 | 214 | 245 | 275 | 306 | 336 |
| 3 | 003 | 034 | 062 | 093 | 123 | 154 | 184 | 215 | 246 | 276 | 307 | 337 |
| 4 | 004 | 035 | 063 | 094 | 124 | 155 | 185 | 216 | 247 | 277 | 308 | 338 |
| 5 | 005 | 036 | 064 | 095 | 125 | 156 | 186 | 217 | 248 | 278 | 309 | 339 |
| 6 | 006 | 037 | 065 | 096 | 126 | 157 | 187 | 218 | 249 | 279 | 310 | 340 |
| 7 | 007 | 038 | 066 | 097 | 127 | 158 | 188 | 219 | 250 | 280 | 311 | 341 |
| 8 | 008 | 039 | 067 | 098 | 128 | 159 | 189 | 220 | 251 | 281 | 312 | 342 |
| 9 | 009 | 040 | 068 | 099 | 129 | 160 | 190 | 221 | 252 | 282 | 313 | 343 |
| 10 | 010 | 041 | 069 | 100 | 130 | 161 | 191 | 222 | 253 | 283 | 314 | 344 |
| 11 | 011 | 042 | 070 | 101 | 131 | 162 | 192 | 223 | 254 | 284 | 315 | 345 |
| 12 | 012 | 043 | 071 | 102 | 132 | 163 | 193 | 224 | 255 | 285 | 316 | 346 |
| 13 | 013 | 044 | 072 | 103 | 133 | 164 | 194 | 225 | 256 | 286 | 317 | 347 |
| 14 | 014 | 045 | 073 | 104 | 134 | 165 | 195 | 226 | 257 | 287 | 318 | 348 |
| 15 | 015 | 046 | 074 | 105 | 135 | 166 | 196 | 227 | 258 | 288 | 319 | 349 |
| 16 | 016 | 047 | 075 | 106 | 136 | 167 | 197 | 228 | 259 | 289 | 320 | 350 |
| 17 | 017 | 048 | 076 | 107 | 137 | 168 | 198 | 229 | 260 | 290 | 321 | 351 |
| 18 | 018 | 049 | 077 | 108 | 138 | 169 | 199 | 230 | 261 | 291 | 322 | 352 |
| 19 | 019 | 050 | 078 | 109 | 139 | 170 | 200 | 231 | 262 | 292 | 323 | 353 |
| 20 | 020 | 051 | 079 | 110 | 140 | 171 | 201 | 232 | 263 | 293 | 324 | 354 |
| 21 | 021 | 052 | 080 | 111 | 141 | 172 | 202 | 233 | 264 | 294 | 325 | 355 |
| 22 | 022 | 053 | 081 | 112 | 142 | 173 | 203 | 234 | 265 | 295 | 326 | 356 |
| 23 | 023 | 054 | 082 | 113 | 143 | 174 | 204 | 235 | 266 | 296 | 327 | 357 |
| 24 | 024 | 055 | 083 | 114 | 144 | 175 | 205 | 236 | 267 | 297 | 328 | 358 |
| 25 | 025 | 056 | 084 | 115 | 145 | 176 | 206 | 237 | 268 | 298 | 329 | 359 |
| 26 | 026 | 057 | 085 | 116 | 146 | 177 | 207 | 238 | 269 | 299 | 330 | 360 |
| 27 | 027 | 058 | 086 | 117 | 147 | 178 | 208 | 239 | 270 | 300 | 331 | 361 |
| 28 | 028 | 059 | 087 | 118 | 148 | 179 | 209 | 240 | 271 | 301 | 332 | 362 |
| 29 | 029 | 088 | 119 | 149 | 180 | 210 | 241 | 272 | 302 | 333 | 363 | |
| 30 | 030 | 089 | 120 | 150 | 181 | 211 | 242 | 273 | 303 | 334 | 364 | |
| 31 | 031 | 090 | 151 | 212 | 243 | 304 | 365 |
Day of the year and leap years
In a leap year every date from March 1 onward has a day number one higher: March 1 is day 60 in 2027 but day 61 in 2028. Always check the year before reading a Julian date on a label. See when the next leap year is.
Frequently asked questions
What is a Julian date?
In business, manufacturing and the military, a Julian date is the day of the year, often with the year in front: YYDDD or YYYYDDD. For example 27032 is February 1, 2027 (day 032 of 2027). Astronomers use a different Julian Day number that counts days since 4713 BC.
What is today's Julian date?
It is shown at the top of this page, updated from your device. When the page was built (Wednesday, November 11, 2026) it was 26315 in YYDDD format, day 315 of the year.
How do I read a Julian date calendar?
Find the month across the top and the day down the side: the number where they meet is the day of the year. Use the leap-year column from March onward in leap years, when every date is one day later.
What day of the year is it?
Today is day 315 of 2026, worked out live at the top of this page. 2026 has 365 days.
How do I convert a Julian date in Excel?
For a YYDDD value in A1, use =DATE(2000+INT(A1/1000),1,MOD(A1,1000)). To turn a date into YYDDD, use =TEXT(A1,"yy")&TEXT(A1-DATE(YEAR(A1),1,0),"000").