Date & Time tools

D-day countdown, age, date difference, and Unix timestamps.

A study timer that repeats 25 min focus + 5 min break, with adjustable durations and a beep. In-browser.

Discharge date, promotion dates, service progress and a D-day countdown from your enlistment date. In-browser.

Convert solar↔lunar dates, with leap months and zodiac. Verified 1900–2100 table. In-browser.

Compare times across zones for meetings. DST-aware.

Explain a crontab expression in plain language and preview upcoming run times. No upload.

By birth date, see senior benefits you qualify for now and soon — pension, free vaccines and more.

From a birth date, dates and D-day for Korean life milestones (dol, hwangap 60, 70, 80…).

From a lunar or solar date, get upcoming memorial days (solar) and the eve.

Time each subject and track cumulative study hours with a weekly chart and CSV. On-device.

Compute due dates and business days excluding weekends and Korean holidays (with substitutes).