Sources
Checked October 8, 2026 · first publish
Every date and every rule on DayReckon traces to a source in this list. Each content page also lists its own sources at the bottom. We use sources for facts only and do not copy their wording.
Holidays and time
| Source | Used for |
|---|---|
| Office of Personnel Management: Federal Holidays | Federal holiday dates and observed dates |
| 5 U.S.C. 6103 (Cornell Legal Information Institute) | Which days are federal holidays |
| Federal Reserve Financial Services: Holiday Schedules | Where Federal Reserve Banks differ from OPM |
| US Naval Observatory: Earth's Seasons | Equinox and solstice times |
| AstroPixels: Solstices and Equinoxes | Second check on season times |
| NOAA NCEI: Meteorological vs astronomical seasons | Meteorological season months |
| NIST: Daylight Saving Time | DST start and end rule |
| US Census Bureau: Easter dates | Easter dates |
| Google Calendar: US Holidays (public feed) | Second check on holiday and popular dates |
| Fiqh Council of North America: calendar | Expected Ramadan and Eid al-Fitr dates |
| USNO: Phases of the Moon | New moon times near Ramadan |
Rules mentioned on "days from today" pages
| Source | Used for |
|---|---|
| California Civil Code 1946.1 | 30- and 60-day rental notice |
| New York Real Property Law 226-c | 30-, 60- and 90-day rental notice |
| Texas Property Code 91.001 | One-month notice for month-to-month tenancy |
| IRS Publication 590-A | 60-day IRA rollover |
| IRS: Substantial presence test | 183-day weighted count |
| Regulation (EU) 2016/399, Schengen Borders Code | 90 days in any 180-day period |
| 12 CFR 1024.41 (eCFR) | 120-day wait before foreclosure referral |
Seasonal and event pages
| Source | Used for |
|---|---|
| USDA FSIS: Turkey Basics: Safe Thawing | Thawing times by weight |
| Rockstar Games: Grand Theft Auto VI | GTA VI release date |
| Take-Two press release on pre-orders (Game Developer repost) | GTA VI platforms and date |
| FBSchedules and FOX 11 Los Angeles | Super Bowl LXI date and venue |
| School district calendars (11 districts, linked on each school page) | Spring break and last day of school |
| Wikipedia city coordinates | Latitude and longitude for sunrise and sunset |
Found a source that has changed?
Agencies revise pages and districts revise calendars. If a date here no longer matches its source, tell us through the contact form with the link. Confirmed fixes are listed on the corrections page.